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-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--arch/powerpc/include/asm/asm-compat.h2
-rw-r--r--arch/powerpc/include/asm/cputable.h4
-rw-r--r--arch/powerpc/include/asm/hw_breakpoint.h74
-rw-r--r--arch/powerpc/include/asm/ppc-opcode.h7
-rw-r--r--arch/powerpc/include/asm/processor.h8
-rw-r--r--arch/powerpc/kernel/Makefile1
-rw-r--r--arch/powerpc/kernel/exceptions-64s.S1
-rw-r--r--arch/powerpc/kernel/hw_breakpoint.c364
-rw-r--r--arch/powerpc/kernel/machine_kexec_64.c3
-rw-r--r--arch/powerpc/kernel/process.c14
-rw-r--r--arch/powerpc/kernel/ptrace.c64
-rw-r--r--arch/powerpc/kernel/signal.c3
-rw-r--r--arch/powerpc/kernel/traps.c8
-rw-r--r--arch/powerpc/lib/Makefile5
-rw-r--r--arch/powerpc/lib/ldstfp.S375
-rw-r--r--arch/powerpc/lib/sstep.c1514
-rw-r--r--kernel/hw_breakpoint.c12
18 files changed, 2408 insertions, 52 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 6506bf4fbff..89bc2e89539 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
select GENERIC_ATOMIC64 if PPC32
select HAVE_PERF_EVENTS
select HAVE_REGS_AND_STACK_ACCESS_API
+ select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
config EARLY_PRINTK
bool
diff --git a/arch/powerpc/include/asm/asm-compat.h b/arch/powerpc/include/asm/asm-compat.h
index 2048a6aeea9..decad950f11 100644
--- a/arch/powerpc/include/asm/asm-compat.h
+++ b/arch/powerpc/include/asm/asm-compat.h
@@ -30,6 +30,7 @@
#define PPC_STLCX stringify_in_c(stdcx.)
#define PPC_CNTLZL stringify_in_c(cntlzd)
#define PPC_LR_STKOFF 16
+#define PPC_MIN_STKFRM 112
/* Move to CR, single-entry optimized version. Only available
* on POWER4 and later.
@@ -55,6 +56,7 @@
#define PPC_CNTLZL stringify_in_c(cntlzw)
#define PPC_MTOCRF stringify_in_c(mtcrf)
#define PPC_LR_STKOFF 4
+#define PPC_MIN_STKFRM 16
#endif
diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index b0b21134f61..5e2e2cfcc81 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -517,6 +517,10 @@ static inline int cpu_has_feature(unsigned long feature)
& feature);
}
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+#define HBP_NUM 1
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
+
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
new file mode 100644
index 00000000000..1c33ec17ca3
--- /dev/null
+++ b/arch/powerpc/include/asm/hw_breakpoint.h
@@ -0,0 +1,74 @@
+/*
+ * PowerPC BookIII S hardware breakpoint definitions
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright 2010, IBM Corporation.
+ * Author: K.Prasad <prasad@linux.vnet.ibm.com>
+ *
+ */
+
+#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
+#define _PPC_BOOK3S_64_HW_BREAKPOINT_H
+
+#ifdef __KERNEL__
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+
+struct arch_hw_breakpoint {
+ bool extraneous_interrupt;
+ u8 len; /* length of the target data symbol */
+ int type;
+ unsigned long address;
+};
+
+#include <linux/kdebug.h>
+#include <asm/reg.h>
+#include <asm/system.h>
+
+struct perf_event;
+struct pmu;
+struct perf_sample_data;
+
+#define HW_BREAKPOINT_ALIGN 0x7
+/* Maximum permissible length of any HW Breakpoint */
+#define HW_BREAKPOINT_LEN 0x8
+
+extern int hw_breakpoint_slots(int type);
+extern int arch_bp_generic_fields(int type, int *gen_bp_type);
+extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
+extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
+extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
+ unsigned long val, void *data);
+int arch_install_hw_breakpoint(struct perf_event *bp);
+void arch_uninstall_hw_breakpoint(struct perf_event *bp);
+void hw_breakpoint_pmu_read(struct perf_event *bp);
+extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
+
+extern struct pmu perf_ops_bp;
+extern void ptrace_triggered(struct perf_event *bp, int nmi,
+ struct perf_sample_data *data, struct pt_regs *regs);
+static inline void hw_breakpoint_disable(void)
+{
+ set_dabr(0);
+}
+extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
+
+#else /* CONFIG_HAVE_HW_BREAKPOINT */
+static inline void hw_breakpoint_disable(void) { }
+static inline void thread_change_pc(struct task_struct *tsk,
+ struct pt_regs *regs) { }
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
+#endif /* __KERNEL__ */
+#endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index d553bbeb726..43adc8b819e 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -52,13 +52,17 @@
#define PPC_INST_WAIT 0x7c00007c
#define PPC_INST_TLBIVAX 0x7c000624
#define PPC_INST_TLBSRX_DOT 0x7c0006a5
+#define PPC_INST_XXLOR 0xf0000510
/* macros to insert fields into opcodes */
#define __PPC_RA(a) (((a) & 0x1f) << 16)
#define __PPC_RB(b) (((b) & 0x1f) << 11)
#define __PPC_RS(s) (((s) & 0x1f) << 21)
#define __PPC_RT(s) __PPC_RS(s)
+#define __PPC_XA(a) ((((a) & 0x1f) << 16) | (((a) & 0x20) >> 3))
+#define __PPC_XB(b) ((((b) & 0x1f) << 11) | (((b) & 0x20) >> 4))
#define __PPC_XS(s) ((((s) & 0x1f) << 21) | (((s) & 0x20) >> 5))
+#define __PPC_XT(s) __PPC_XS(s)
#define __PPC_T_TLB(t) (((t) & 0x3) << 21)
#define __PPC_WC(w) (((w) & 0x3) << 21)
/*
@@ -106,9 +110,12 @@
* the 128 bit load store instructions based on that.
*/
#define VSX_XX1(s, a, b) (__PPC_XS(s) | __PPC_RA(a) | __PPC_RB(b))
+#define VSX_XX3(t, a, b) (__PPC_XT(t) | __PPC_XA(a) | __PPC_XB(b))
#define STXVD2X(s, a, b) stringify_in_c(.long PPC_INST_STXVD2X | \
VSX_XX1((s), (a), (b)))
#define LXVD2X(s, a, b) stringify_in_c(.long PPC_INST_LXVD2X | \
VSX_XX1((s), (a), (b)))
+#define XXLOR(t, a, b) stringify_in_c(.long PPC_INST_XXLOR | \
+ VSX_XX3((t), (a), (b)))
#endif /* _ASM_POWERPC_PPC_OPCODE_H */
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 7492fe8ad6e..19c05b0f74b 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -209,6 +209,14 @@ struct thread_struct {
#ifdef CONFIG_PPC64
unsigned long start_tb; /* Start purr when proc switched in */
unsigned long accum_tb; /* Total accumilated purr for process */
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ struct perf_event *ptrace_bps[HBP_NUM];
+ /*
+ * Helps identify source of single-step exception and subsequent
+ * hw-breakpoint enablement
+ */
+ struct perf_event *last_hit_ubp;
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif
unsigned long dabr; /* Data address breakpoint register */
#ifdef CONFIG_ALTIVEC
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 58d0572de6f..01006040f59 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -34,6 +34,7 @@ obj-y += vdso32/
obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
signal_64.o ptrace32.o \
paca.o nvram_64.o firmware.o
+obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_PPC_BOOK3S_64) += cpu_setup_ppc970.o cpu_setup_pa6t.o
obj64-$(CONFIG_RELOCATABLE) += reloc_64.o
obj-$(CONFIG_PPC_BOOK3E_64) += exceptions-64e.o
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 3e423fbad6b..f53029a0155 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -828,6 +828,7 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES)
/* We have a data breakpoint exception - handle it */
handle_dabr_fault:
+ bl .save_nvgprs
ld r4,_DAR(r1)
ld r5,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
new file mode 100644
index 00000000000..5ecd0401cdb
--- /dev/null
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -0,0 +1,364 @@
+/*
+ * HW_breakpoint: a unified kernel/user-space hardware breakpoint facility,
+ * using the CPU's debug registers. Derived from
+ * "arch/x86/kernel/hw_breakpoint.c"
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright 2010 IBM Corporation
+ * Author: K.Prasad <prasad@linux.vnet.ibm.com>
+ *
+ */
+
+#include <linux/hw_breakpoint.h>
+#include <linux/notifier.h>
+#include <linux/kprobes.h>
+#include <linux/percpu.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+
+#include <asm/hw_breakpoint.h>
+#include <asm/processor.h>
+#include <asm/sstep.h>
+#include <asm/uaccess.h>
+
+/*
+ * Stores the breakpoints currently in use on each breakpoint address
+ * register for every cpu
+ */
+static DEFINE_PER_CPU(struct perf_event *, bp_per_reg);
+
+/*
+ * Returns total number of data or instruction breakpoints available.
+ */
+int hw_breakpoint_slots(int type)
+{
+ if (type == TYPE_DATA)
+ return HBP_NUM;
+ return 0; /* no instruction breakpoints available */
+}
+
+/*
+ * Install a perf counter breakpoint.
+ *
+ * We seek a free debug address register and use it for this
+ * breakpoint.
+ *
+ * Atomic: we hold the counter->ctx->lock and we only handle variables
+ * and registers local to this cpu.
+ */
+int arch_install_hw_breakpoint(struct perf_event *bp)
+{
+ struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+ struct perf_event **slot = &__get_cpu_var(bp_per_reg);
+
+ *slot = bp;
+
+ /*
+ * Do not install DABR values if the instruction must be single-stepped.
+ * If so, DABR will be populated in single_step_dabr_instruction().
+ */
+ if (current->thread.last_hit_ubp != bp)
+ set_dabr(info->address | info->type | DABR_TRANSLATION);
+
+ return 0;
+}
+
+/*
+ * Uninstall the breakpoint contained in the given counter.
+ *
+ * First we search the debug address register it uses and then we disable
+ * it.
+ *
+ * Atomic: we hold the counter->ctx->lock and we only handle variables
+ * and registers local to this cpu.
+ */
+void arch_uninstall_hw_breakpoint(struct perf_event *bp)
+{
+ struct perf_event **slot = &__get_cpu_var(bp_per_reg);
+
+ if (*slot != bp) {
+ WARN_ONCE(1, "Can't find the breakpoint");
+ return;
+ }
+
+ *slot = NULL;
+ set_dabr(0);
+}
+
+/*
+ * Perform cleanup of arch-specific counters during unregistration
+ * of the perf-event
+ */
+void arch_unregister_hw_breakpoint(struct perf_event *bp)
+{
+ /*
+ * If the breakpoint is unregistered between a hw_breakpoint_handler()
+ * and the single_step_dabr_instruction(), then cleanup the breakpoint
+ * restoration variables to prevent dangling pointers.
+ */
+ if (bp->ctx->task)
+ bp->ctx->task->thread.last_hit_ubp = NULL;
+}
+
+/*
+ * Check for virtual address in kernel space.
+ */
+int arch_check_bp_in_kernelspace(struct perf_event *bp)
+{
+ struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+
+ return is_kernel_addr(info->address);
+}
+
+int arch_bp_generic_fields(int type, int *gen_bp_type)
+{
+ switch (type) {
+ case DABR_DATA_READ:
+ *gen_bp_type = HW_BREAKPOINT_R;
+ break;
+ case DABR_DATA_WRITE:
+ *gen_bp_type = HW_BREAKPOINT_W;
+ break;
+ case (DABR_DATA_WRITE | DABR_DATA_READ):
+ *gen_bp_type = (HW_BREAKPOINT_W | HW_BREAKPOINT_R);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * Validate the arch-specific HW Breakpoint register settings
+ */
+int arch_validate_hwbkpt_settings(struct perf_event *bp)
+{
+ int ret = -EINVAL;
+ struct arch_hw_breakpoint *info = counter_arch_bp(bp);
+
+ if (!bp)
+ return ret;
+
+ switch (bp->attr.bp_type) {
+ case HW_BREAKPOINT_R:
+ info->type = DABR_DATA_READ;
+ break;
+ case HW_BREAKPOINT_W:
+ info->type = DABR_DATA_WRITE;
+ break;
+ case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
+ info->type = (DABR_DATA_READ | DABR_DATA_WRITE);
+ break;
+ default:
+ return ret;
+ }
+
+ info->address = bp->attr.bp_addr;
+ info->len = bp->attr.bp_len;
+
+ /*
+ * Since breakpoint length can be a maximum of HW_BREAKPOINT_LEN(8)
+ * and breakpoint addresses are aligned to nearest double-word
+ * HW_BREAKPOINT_ALIGN by rounding off to the lower address, the
+ * 'symbolsize' should satisfy the check below.
+ */
+ if (info->len >
+ (HW_BREAKPOINT_LEN - (info->address & HW_BREAKPOINT_ALIGN)))
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * Restores the breakpoint on the debug registers.
+ * Invoke this function if it is known that the execution context is
+ * about to change to cause loss of MSR_SE settings.
+ */
+void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs)
+{
+ struct arch_hw_breakpoint *info;
+
+ if (likely(!tsk->thread.last_hit_ubp))
+ return;
+
+ info = counter_arch_bp(tsk->thread.last_hit_ubp);
+ regs->msr &= ~MSR_SE;
+ set_dabr(info->address | info->type | DABR_TRANSLATION);
+ tsk->thread.last_hit_ubp = NULL;
+}
+
+/*
+ * Handle debug exception notifications.
+ */
+int __kprobes hw_breakpoint_handler(struct die_args *args)
+{
+ int rc = NOTIFY_STOP;
+ struct perf_event *bp;
+ struct pt_regs *regs = args->regs;
+ int stepped = 1;
+ struct arch_hw_breakpoint *info;
+ unsigned int instr;
+ unsigned long dar = regs->dar;
+
+ /* Disable breakpoints during exception handling */
+ set_dabr(0);
+
+ /*
+ * The counter may be concurrently released but that can only
+ * occur from a call_rcu() path. We can then safely fetch
+ * the breakpoint, use its callback, touch its counter
+ * while we are in an rcu_read_lock() path.
+ */
+ rcu_read_lock();
+
+ bp = __get_cpu_var(bp_per_reg);
+ if (!bp)
+ goto out;
+ info = counter_arch_bp(bp);
+
+ /*
+ * Return early after invoking user-callback function without restoring
+ * DABR if the breakpoint is from ptrace which always operates in
+ * one-shot mode. The ptrace-ed process will receive the SIGTRAP signal
+ * generated in do_dabr().
+ */
+ if (bp->overflow_handler == ptrace_triggered) {
+ perf_bp_event(bp, regs);
+ rc = NOTIFY_DONE;
+ goto out;
+ }
+
+ /*
+ * Verify if dar lies within the address range occupied by the symbol
+ * being watched to filter extraneous exceptions. If it doesn't,
+ * we still need to single-step the instruction, but we don't
+ * generate an event.
+ */
+ info->extraneous_interrupt = !((bp->attr.bp_addr <= dar) &&
+ (dar - bp->attr.bp_addr < bp->attr.bp_len));
+
+ /* Do not emulate user-space instructions, instead single-step them */
+ if (user_mode(regs)) {
+ bp->ctx->task->thread.last_hit_ubp = bp;
+ regs->msr |= MSR_SE;
+ goto out;
+ }
+
+ stepped = 0;
+ instr = 0;
+ if (!__get_user_inatomic(instr, (unsigned int *) regs->nip))
+ stepped = emulate_step(regs, instr);
+
+ /*
+ * emulate_step() could not execute it. We've failed in reliably
+ * handling the hw-breakpoint. Unregister it and throw a warning
+ * message to let the user know about it.
+ */
+ if (!stepped) {
+ WARN(1, "Unable to handle hardware breakpoint. Breakpoint at "
+ "0x%lx will be disabled.", info->address);
+ perf_event_disable(bp);
+ goto out;
+ }
+ /*
+ * As a policy, the callback is invoked in a 'trigger-after-execute'
+ * fashion
+ */
+ if (!info->extraneous_interrupt)
+ perf_bp_event(bp, regs);
+
+ set_dabr(info->address | info->type | DABR_TRANSLATION);
+out:
+ rcu_read_unlock();
+ return rc;
+}
+
+/*
+ * Handle single-step exceptions following a DABR hit.
+ */
+int __kprobes single_step_dabr_instruction(struct die_args *args)
+{
+ struct pt_regs *regs = args->regs;
+ struct perf_event *bp = NULL;
+ struct arch_hw_breakpoint *bp_info;
+
+ bp = current->thread.last_hit_ubp;
+ /*
+ * Check if we are single-stepping as a result of a
+ * previous HW Breakpoint exception
+ */
+ if (!bp)
+ return NOTIFY_DONE;
+
+ bp_info = counter_arch_bp(bp);
+
+ /*
+ * We shall invoke the user-defined callback function in the single
+ * stepping handler to confirm to 'trigger-after-execute' semantics
+ */
+ if (!bp_info->extraneous_interrupt)
+ perf_bp_event(bp, regs);
+
+ set_dabr(bp_info->address | bp_info->type | DABR_TRANSLATION);
+ current->thread.last_hit_ubp = NULL;
+
+ /*
+ * If the process was being single-stepped by ptrace, let the
+ * other single-step actions occur (e.g. generate SIGTRAP).
+ */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ return NOTIFY_DONE;
+
+ return NOTIFY_STOP;
+}
+
+/*
+ * Handle debug exception notifications.
+ */
+int __kprobes hw_breakpoint_exceptions_notify(
+ struct notifier_block *unused, unsigned long val, void *data)
+{
+ int ret = NOTIFY_DONE;
+
+ switch (val) {
+ case DIE_DABR_MATCH:
+ ret = hw_breakpoint_handler(data);
+ break;
+ case DIE_SSTEP:
+ ret = single_step_dabr_instruction(data);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Release the user breakpoints used by ptrace
+ */
+void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
+{
+ struct thread_struct *t = &tsk->thread;
+
+ unregister_hw_breakpoint(t->ptrace_bps[0]);
+ t->ptrace_bps[0] = NULL;
+}
+
+void hw_breakpoint_pmu_read(struct perf_event *bp)
+{
+ /* TODO */
+}
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index ed31a29c4ff..de6b70eac51 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -25,6 +25,7 @@
#include <asm/sections.h> /* _end */
#include <asm/prom.h>
#include <asm/smp.h>
+#include <asm/hw_breakpoint.h>
int default_machine_kexec_prepare(struct kimage *image)
{
@@ -165,6 +166,7 @@ static void kexec_smp_down(void *arg)
while(kexec_all_irq_disabled == 0)
cpu_relax();
mb(); /* make sure all irqs are disabled before this */
+ hw_breakpoint_disable();
/*
* Now every CPU has IRQs off, we can clear out any pending
* IPIs and be sure that no more will come in after this.
@@ -180,6 +182,7 @@ static void kexec_prepare_cpus_wait(int wait_state)
{
int my_cpu, i, notified=-1;
+ hw_breakpoint_disable();
my_cpu = get_cpu();
/* Make sure each CPU has atleast made it to the state we need */
for_each_online_cpu(i) {
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 773424df828..1e78453645b 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -37,6 +37,7 @@
#include <linux/kernel_stat.h>
#include <linux/personality.h>
#include <linux/random.h>
+#include <linux/hw_breakpoint.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
@@ -462,8 +463,14 @@ struct task_struct *__switch_to(struct task_struct *prev,
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
switch_booke_debug_regs(&new->thread);
#else
+/*
+ * For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would
+ * schedule DABR
+ */
+#ifndef CONFIG_HAVE_HW_BREAKPOINT
if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
set_dabr(new->thread.dabr);
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
#endif
@@ -642,7 +649,11 @@ void flush_thread(void)
{
discard_lazy_cpu_state();
+#ifdef CONFIG_HAVE_HW_BREAKPOINTS
+ flush_ptrace_hw_breakpoint(current);
+#else /* CONFIG_HAVE_HW_BREAKPOINTS */
set_debug_reg_defaults(&current->thread);
+#endif /* CONFIG_HAVE_HW_BREAKPOINTS */
}
void
@@ -660,6 +671,9 @@ void prepare_to_copy(struct task_struct *tsk)
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
flush_spe_to_thread(current);
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ flush_ptrace_hw_breakpoint(tsk);
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
}
/*
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 7a0c0199ea2..11f3cd9c832 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -32,6 +32,8 @@
#ifdef CONFIG_PPC32
#include <linux/module.h>
#endif
+#include <linux/hw_breakpoint.h>
+#include <linux/perf_event.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@@ -866,9 +868,34 @@ void user_disable_single_step(struct task_struct *task)
clear_tsk_thread_flag(task, TIF_SINGLESTEP);
}
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+void ptrace_triggered(struct perf_event *bp, int nmi,
+ struct perf_sample_data *data, struct pt_regs *regs)
+{
+ struct perf_event_attr attr;
+
+ /*
+ * Disable the breakpoint request here since ptrace has defined a
+ * one-shot behaviour for breakpoint exceptions in PPC64.
+ * The SIGTRAP signal is generated automatically for us in do_dabr().
+ * We don't have to do anything about that here
+ */
+ attr = bp->attr;
+ attr.disabled = true;
+ modify_user_hw_breakpoint(bp, &attr);
+}
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
+
int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
unsigned long data)
{
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ int ret;
+ struct thread_struct *thread = &(task->thread);
+ struct perf_event *bp;
+ struct perf_event_attr attr;
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
+
/* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
* For embedded processors we support one DAC and no IAC's at the
* moment.
@@ -896,6 +923,43 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
/* Ensure breakpoint translation bit is set */
if (data && !(data & DABR_TRANSLATION))
return -EIO;
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ bp = thread->ptrace_bps[0];
+ if ((!data) || !(data & (DABR_DATA_WRITE | DABR_DATA_READ))) {
+ if (bp) {
+ unregister_hw_breakpoint(bp);
+ thread->ptrace_bps[0] = NULL;
+ }
+ return 0;
+ }
+ if (bp) {
+ attr = bp->attr;
+ attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
+ arch_bp_generic_fields(data &
+ (DABR_DATA_WRITE | DABR_DATA_READ),
+ &attr.bp_type);
+ ret = modify_user_hw_breakpoint(bp, &attr);
+ if (ret)
+ return ret;
+ thread->ptrace_bps[0] = bp;
+ thread->dabr = data;
+ return 0;
+ }
+
+ /* Create a new breakpoint request if one doesn't exist already */
+ hw_breakpoint_init(&attr);
+ attr.bp_addr = data & ~HW_BREAKPOINT_ALIGN;
+ arch_bp_generic_fields(data & (DABR_DATA_WRITE | DABR_DATA_READ),
+ &attr.bp_type);
+
+ thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
+ ptrace_triggered, task);
+ if (IS_ERR(bp)) {
+ thread->ptrace_bps[0] = NULL;
+ return PTR_ERR(bp);
+ }
+
+#endif /* CONFIG_HAVE_HW_BREAKPOINT */
/* Move contents to the DABR register */
task->thread.dabr = data;
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index a0afb555a7c..7109f5b1baa 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -11,6 +11,7 @@
#include <linux/tracehook.h>
#include <linux/signal.h>
+#include <asm/hw_breakpoint.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -149,6 +150,8 @@ static int do_signal_pending(sigset_t *oldset, struct pt_regs *regs)
if (current->thread.dabr)
set_dabr(current->thread.dabr);
#endif
+ /* Re-enable the breakpoints for the signal stack */
+ thread_change_pc(current, regs);
if (is32) {
if (ka.sa.sa_flags & SA_SIGINFO)
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 25fc33984c2..e5fe5a8522a 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -688,7 +688,7 @@ void RunModeException(struct pt_regs *regs)
void __kprobes single_step_exception(struct pt_regs *regs)
{
- regs->msr &= ~(MSR_SE | MSR_BE); /* Turn off 'trace' bits */
+ clear_single_step(regs);
if (notify_die(DIE_SSTEP, "single_step", regs, 5,
5, SIGTRAP) == NOTIFY_STOP)
@@ -707,10 +707,8 @@ void __kprobes single_step_exception(struct pt_regs *regs)
*/
static void emulate_single_step(struct pt_regs *regs)
{
- if (single_stepping(regs)) {
- clear_single_step(regs);
- _exception(SIGTRAP, regs, TRAP_TRACE, 0);
- }
+ if (single_stepping(regs))
+ single_step_exception(regs);
}
static inline int __parse_fpscr(unsigned long fpscr)
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 111da1c03a1..5bb89c82807 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -18,8 +18,9 @@ obj-$(CONFIG_HAS_IOMEM) += devres.o
obj-$(CONFIG_PPC64) += copypage_64.o copyuser_64.o \
memcpy_64.o usercopy_64.o mem_64.o string.o
-obj-$(CONFIG_XMON) += sstep.o
-obj-$(CONFIG_KPROBES) += sstep.o
+obj-$(CONFIG_XMON) += sstep.o ldstfp.o
+obj-$(CONFIG_KPROBES) += sstep.o ldstfp.o
+obj-$(CONFIG_HAVE_HW_BREAKPOINT) += sstep.o ldstfp.o
ifeq ($(CONFIG_PPC64),y)
obj-$(CONFIG_SMP) += locks.o
diff --git a/arch/powerpc/lib/ldstfp.S b/arch/powerpc/lib/ldstfp.S
new file mode 100644
index 00000000000..f6448636baf
--- /dev/null
+++ b/arch/powerpc/lib/ldstfp.S
@@ -0,0 +1,375 @@
+/*
+ * Floating-point, VMX/Altivec and VSX loads and stores
+ * for use in instruction emulation.
+ *
+ * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/ppc-opcode.h>
+#include <asm/reg.h>
+#include <asm/asm-offsets.h>
+#include <linux/errno.h>
+
+#define STKFRM (PPC_MIN_STKFRM + 16)
+
+ .macro extab instr,handler
+ .section __ex_table,"a"
+ PPC_LONG \instr,\handler
+ .previous
+ .endm
+
+ .macro inst32 op
+reg = 0
+ .rept 32
+20: \op reg,0,r4
+ b 3f
+ extab 20b,99f
+reg = reg + 1
+ .endr
+ .endm
+
+/* Get the contents of frN into fr0; N is in r3. */
+_GLOBAL(get_fpr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* fr0 is already in fr0 */
+ nop
+reg = 1
+ .rept 31
+ fmr fr0,reg
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of fr0 into frN; N is in r3. */
+_GLOBAL(put_fpr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* fr0 is already in fr0 */
+ nop
+reg = 1
+ .rept 31
+ fmr reg,fr0
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load FP reg N from float at *p. N is in r3, p in r4. */
+_GLOBAL(do_lfs)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+1: li r9,-EFAULT
+2: lfs fr0,0(r4)
+ li r9,0
+3: bl put_fpr
+ beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Load FP reg N from double at *p. N is in r3, p in r4. */
+_GLOBAL(do_lfd)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+1: li r9,-EFAULT
+2: lfd fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ bl put_fpr
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store FP reg N to float at *p. N is in r3, p in r4. */
+_GLOBAL(do_stfs)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+ bl get_fpr
+1: li r9,-EFAULT
+2: stfs fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store FP reg N to double at *p. N is in r3, p in r4. */
+_GLOBAL(do_stfd)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ ori r7,r6,MSR_FP
+ cmpwi cr7,r3,0
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stfd fr0,STKFRM-16(r1)
+ bl get_fpr
+1: li r9,-EFAULT
+2: stfd fr0,0(r4)
+ li r9,0
+3: beq cr7,4f
+ lfd fr0,STKFRM-16(r1)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+#ifdef CONFIG_ALTIVEC
+/* Get the contents of vrN into vr0; N is in r3. */
+_GLOBAL(get_vr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 31
+ vor vr0,reg,reg /* assembler doesn't know vmr? */
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of vr0 into vrN; N is in r3. */
+_GLOBAL(put_vr)
+ mflr r0
+ rlwinm r3,r3,3,0xf8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 31
+ vor reg,vr0,vr0
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load vector reg N from *p. N is in r3, p in r4. */
+_GLOBAL(do_lvx)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VEC@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stvx vr0,r1,r8
+1: li r9,-EFAULT
+2: lvx vr0,0,r4
+ li r9,0
+3: beq cr7,4f
+ bl put_vr
+ lvx vr0,r1,r8
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store vector reg N to *p. N is in r3, p in r4. */
+_GLOBAL(do_stvx)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VEC@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ stvx vr0,r1,r8
+ bl get_vr
+1: li r9,-EFAULT
+2: stvx vr0,0,r4
+ li r9,0
+3: beq cr7,4f
+ lvx vr0,r1,r8
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_VSX
+/* Get the contents of vsrN into vsr0; N is in r3. */
+_GLOBAL(get_vsr)
+ mflr r0
+ rlwinm r3,r3,3,0x1f8
+ bcl 20,31,1f
+ blr /* vsr0 is already in vsr0 */
+ nop
+reg = 1
+ .rept 63
+ XXLOR(0,reg,reg)
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Put the contents of vsr0 into vsrN; N is in r3. */
+_GLOBAL(put_vsr)
+ mflr r0
+ rlwinm r3,r3,3,0x1f8
+ bcl 20,31,1f
+ blr /* vr0 is already in vr0 */
+ nop
+reg = 1
+ .rept 63
+ XXLOR(reg,0,0)
+ blr
+reg = reg + 1
+ .endr
+1: mflr r5
+ add r5,r3,r5
+ mtctr r5
+ mtlr r0
+ bctr
+
+/* Load VSX reg N from vector doubleword *p. N is in r3, p in r4. */
+_GLOBAL(do_lxvd2x)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VSX@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ STXVD2X(0,r1,r8)
+1: li r9,-EFAULT
+2: LXVD2X(0,0,r4)
+ li r9,0
+3: beq cr7,4f
+ bl put_vsr
+ LXVD2X(0,r1,r8)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+/* Store VSX reg N to vector doubleword *p. N is in r3, p in r4. */
+_GLOBAL(do_stxvd2x)
+ PPC_STLU r1,-STKFRM(r1)
+ mflr r0
+ PPC_STL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mfmsr r6
+ oris r7,r6,MSR_VSX@h
+ cmpwi cr7,r3,0
+ li r8,STKFRM-16
+ mtmsrd r7
+ isync
+ beq cr7,1f
+ STXVD2X(0,r1,r8)
+ bl get_vsr
+1: li r9,-EFAULT
+2: STXVD2X(0,0,r4)
+ li r9,0
+3: beq cr7,4f
+ LXVD2X(0,r1,r8)
+4: PPC_LL r0,STKFRM+PPC_LR_STKOFF(r1)
+ mtlr r0
+ mtmsrd r6
+ isync
+ mr r3,r9
+ addi r1,r1,STKFRM
+ blr
+ extab 2b,3b
+
+#endif /* CONFIG_VSX */
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 13b7d54f185..e0a9858d537 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -13,6 +13,8 @@
#include <linux/ptrace.h>
#include <asm/sstep.h>
#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/cputable.h>
extern char system_call_common[];
@@ -23,6 +25,23 @@ extern char system_call_common[];
#define MSR_MASK 0x87c0ffff
#endif
+/* Bits in XER */
+#define XER_SO 0x80000000U
+#define XER_OV 0x40000000U
+#define XER_CA 0x20000000U
+
+/*
+ * Functions in ldstfp.S
+ */
+extern int do_lfs(int rn, unsigned long ea);
+extern int do_lfd(int rn, unsigned long ea);
+extern int do_stfs(int rn, unsigned long ea);
+extern int do_stfd(int rn, unsigned long ea);
+extern int do_lvx(int rn, unsigned long ea);
+extern int do_stvx(int rn, unsigned long ea);
+extern int do_lxvd2x(int rn, unsigned long ea);
+extern int do_stxvd2x(int rn, unsigned long ea);
+
/*
* Determine whether a conditional branch instruction would branch.
*/
@@ -46,16 +65,499 @@ static int __kprobes branch_taken(unsigned int instr, struct pt_regs *regs)
return 1;
}
+
+static long __kprobes address_ok(struct pt_regs *regs, unsigned long ea, int nb)
+{
+ if (!user_mode(regs))
+ return 1;
+ return __access_ok(ea, nb, USER_DS);
+}
+
+/*
+ * Calculate effective address for a D-form instruction
+ */
+static unsigned long __kprobes dform_ea(unsigned int instr, struct pt_regs *regs)
+{
+ int ra;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ ea = (signed short) instr; /* sign-extend */
+ if (ra) {
+ ea += regs->gpr[ra];
+ if (instr & 0x04000000) /* update forms */
+ regs->gpr[ra] = ea;
+ }
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_SF))
+ ea &= 0xffffffffUL;
+#endif
+ return ea;
+}
+
+#ifdef __powerpc64__
+/*
+ * Calculate effective address for a DS-form instruction
+ */
+static unsigned long __kprobes dsform_ea(unsigned int instr, struct pt_regs *regs)
+{
+ int ra;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ ea = (signed short) (instr & ~3); /* sign-extend */
+ if (ra) {
+ ea += regs->gpr[ra];
+ if ((instr & 3) == 1) /* update forms */
+ regs->gpr[ra] = ea;
+ }
+ if (!(regs->msr & MSR_SF))
+ ea &= 0xffffffffUL;
+ return ea;
+}
+#endif /* __powerpc64 */
+
+/*
+ * Calculate effective address for an X-form instruction
+ */
+static unsigned long __kprobes xform_ea(unsigned int instr, struct pt_regs *regs,
+ int do_update)
+{
+ int ra, rb;
+ unsigned long ea;
+
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+ ea = regs->gpr[rb];
+ if (ra) {
+ ea += regs->gpr[ra];
+ if (do_update) /* update forms */
+ regs->gpr[ra] = ea;
+ }
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_SF))
+ ea &= 0xffffffffUL;
+#endif
+ return ea;
+}
+
+/*
+ * Return the largest power of 2, not greater than sizeof(unsigned long),
+ * such that x is a multiple of it.
+ */
+static inline unsigned long max_align(unsigned long x)
+{
+ x |= sizeof(unsigned long);
+ return x & -x; /* isolates rightmost bit */
+}
+
+
+static inline unsigned long byterev_2(unsigned long x)
+{
+ return ((x >> 8) & 0xff) | ((x & 0xff) << 8);
+}
+
+static inline unsigned long byterev_4(unsigned long x)
+{
+ return ((x >> 24) & 0xff) | ((x >> 8) & 0xff00) |
+ ((x & 0xff00) << 8) | ((x & 0xff) << 24);
+}
+
+#ifdef __powerpc64__
+static inline unsigned long byterev_8(unsigned long x)
+{
+ return (byterev_4(x) << 32) | byterev_4(x >> 32);
+}
+#endif
+
+static int __kprobes read_mem_aligned(unsigned long *dest, unsigned long ea,
+ int nb)
+{
+ int err = 0;
+ unsigned long x = 0;
+
+ switch (nb) {
+ case 1:
+ err = __get_user(x, (unsigned char __user *) ea);
+ break;
+ case 2:
+ err = __get_user(x, (unsigned short __user *) ea);
+ break;
+ case 4:
+ err = __get_user(x, (unsigned int __user *) ea);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ err = __get_user(x, (unsigned long __user *) ea);
+ break;
+#endif
+ }
+ if (!err)
+ *dest = x;
+ return err;
+}
+
+static int __kprobes read_mem_unaligned(unsigned long *dest, unsigned long ea,
+ int nb, struct pt_regs *regs)
+{
+ int err;
+ unsigned long x, b, c;
+
+ /* unaligned, do this in pieces */
+ x = 0;
+ for (; nb > 0; nb -= c) {
+ c = max_align(ea);
+ if (c > nb)
+ c = max_align(nb);
+ err = read_mem_aligned(&b, ea, c);
+ if (err)
+ return err;
+ x = (x << (8 * c)) + b;
+ ea += c;
+ }
+ *dest = x;
+ return 0;
+}
+
+/*
+ * Read memory at address ea for nb bytes, return 0 for success
+ * or -EFAULT if an error occurred.
+ */
+static int __kprobes read_mem(unsigned long *dest, unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & (nb - 1)) == 0)
+ return read_mem_aligned(dest, ea, nb);
+ return read_mem_unaligned(dest, ea, nb, regs);
+}
+
+static int __kprobes write_mem_aligned(unsigned long val, unsigned long ea,
+ int nb)
+{
+ int err = 0;
+
+ switch (nb) {
+ case 1:
+ err = __put_user(val, (unsigned char __user *) ea);
+ break;
+ case 2:
+ err = __put_user(val, (unsigned short __user *) ea);
+ break;
+ case 4:
+ err = __put_user(val, (unsigned int __user *) ea);
+ break;
+#ifdef __powerpc64__
+ case 8:
+ err = __put_user(val, (unsigned long __user *) ea);
+ break;
+#endif
+ }
+ return err;
+}
+
+static int __kprobes write_mem_unaligned(unsigned long val, unsigned long ea,
+ int nb, struct pt_regs *regs)
+{
+ int err;
+ unsigned long c;
+
+ /* unaligned or little-endian, do this in pieces */
+ for (; nb > 0; nb -= c) {
+ c = max_align(ea);
+ if (c > nb)
+ c = max_align(nb);
+ err = write_mem_aligned(val >> (nb - c) * 8, ea, c);
+ if (err)
+ return err;
+ ++ea;
+ }
+ return 0;
+}
+
+/*
+ * Write memory at address ea for nb bytes, return 0 for success
+ * or -EFAULT if an error occurred.
+ */
+static int __kprobes write_mem(unsigned long val, unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & (nb - 1)) == 0)
+ return write_mem_aligned(val, ea, nb);
+ return write_mem_unaligned(val, ea, nb, regs);
+}
+
/*
- * Emulate instructions that cause a transfer of control.
+ * Check the address and alignment, and call func to do the actual
+ * load or store.
+ */
+static int __kprobes do_fp_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[sizeof(double) / sizeof(long)];
+ unsigned long ptr;
+
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ ptr = (unsigned long) &val[0];
+ if (sizeof(unsigned long) == 8 || nb == 4) {
+ err = read_mem_unaligned(&val[0], ea, nb, regs);
+ ptr += sizeof(unsigned long) - nb;
+ } else {
+ /* reading a double on 32-bit */
+ err = read_mem_unaligned(&val[0], ea, 4, regs);
+ if (!err)
+ err = read_mem_unaligned(&val[1], ea + 4, 4, regs);
+ }
+ if (err)
+ return err;
+ return (*func)(rn, ptr);
+}
+
+static int __kprobes do_fp_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, int nb,
+ struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[sizeof(double) / sizeof(long)];
+ unsigned long ptr;
+
+ if (!address_ok(regs, ea, nb))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ ptr = (unsigned long) &val[0];
+ if (sizeof(unsigned long) == 8 || nb == 4) {
+ ptr += sizeof(unsigned long) - nb;
+ err = (*func)(rn, ptr);
+ if (err)
+ return err;
+ err = write_mem_unaligned(val[0], ea, nb, regs);
+ } else {
+ /* writing a double on 32-bit */
+ err = (*func)(rn, ptr);
+ if (err)
+ return err;
+ err = write_mem_unaligned(val[0], ea, 4, regs);
+ if (!err)
+ err = write_mem_unaligned(val[1], ea + 4, 4, regs);
+ }
+ return err;
+}
+
+#ifdef CONFIG_ALTIVEC
+/* For Altivec/VMX, no need to worry about alignment */
+static int __kprobes do_vec_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea & ~0xfUL, 16))
+ return -EFAULT;
+ return (*func)(rn, ea);
+}
+
+static int __kprobes do_vec_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ if (!address_ok(regs, ea & ~0xfUL, 16))
+ return -EFAULT;
+ return (*func)(rn, ea);
+}
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef CONFIG_VSX
+static int __kprobes do_vsx_load(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[2];
+
+ if (!address_ok(regs, ea, 16))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ err = read_mem_unaligned(&val[0], ea, 8, regs);
+ if (!err)
+ err = read_mem_unaligned(&val[1], ea + 8, 8, regs);
+ if (!err)
+ err = (*func)(rn, (unsigned long) &val[0]);
+ return err;
+}
+
+static int __kprobes do_vsx_store(int rn, int (*func)(int, unsigned long),
+ unsigned long ea, struct pt_regs *regs)
+{
+ int err;
+ unsigned long val[2];
+
+ if (!address_ok(regs, ea, 16))
+ return -EFAULT;
+ if ((ea & 3) == 0)
+ return (*func)(rn, ea);
+ err = (*func)(rn, (unsigned long) &val[0]);
+ if (err)
+ return err;
+ err = write_mem_unaligned(val[0], ea, 8, regs);
+ if (!err)
+ err = write_mem_unaligned(val[1], ea + 8, 8, regs);
+ return err;
+}
+#endif /* CONFIG_VSX */
+
+#define __put_user_asmx(x, addr, err, op, cr) \
+ __asm__ __volatile__( \
+ "1: " op " %2,0,%3\n" \
+ " mfcr %1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%4\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err), "=r" (cr) \
+ : "r" (x), "r" (addr), "i" (-EFAULT), "0" (err))
+
+#define __get_user_asmx(x, addr, err, op) \
+ __asm__ __volatile__( \
+ "1: "op" %1,0,%2\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%3\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err), "=r" (x) \
+ : "r" (addr), "i" (-EFAULT), "0" (err))
+
+#define __cacheop_user_asmx(addr, err, op) \
+ __asm__ __volatile__( \
+ "1: "op" 0,%1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: li %0,%3\n" \
+ " b 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ PPC_LONG_ALIGN "\n" \
+ PPC_LONG "1b,3b\n" \
+ ".previous" \
+ : "=r" (err) \
+ : "r" (addr), "i" (-EFAULT), "0" (err))
+
+static void __kprobes set_cr0(struct pt_regs *regs, int rd)
+{
+ long val = regs->gpr[rd];
+
+ regs->ccr = (regs->ccr & 0x0fffffff) | ((regs->xer >> 3) & 0x10000000);
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_SF))
+ val = (int) val;
+#endif
+ if (val < 0)
+ regs->ccr |= 0x80000000;
+ else if (val > 0)
+ regs->ccr |= 0x40000000;
+ else
+ regs->ccr |= 0x20000000;
+}
+
+static void __kprobes add_with_carry(struct pt_regs *regs, int rd,
+ unsigned long val1, unsigned long val2,
+ unsigned long carry_in)
+{
+ unsigned long val = val1 + val2;
+
+ if (carry_in)
+ ++val;
+ regs->gpr[rd] = val;
+#ifdef __powerpc64__
+ if (!(regs->msr & MSR_SF)) {
+ val = (unsigned int) val;
+ val1 = (unsigned int) val1;
+ }
+#endif
+ if (val < val1 || (carry_in && val == val1))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+}
+
+static void __kprobes do_cmp_signed(struct pt_regs *regs, long v1, long v2,
+ int crfld)
+{
+ unsigned int crval, shift;
+
+ crval = (regs->xer >> 31) & 1; /* get SO bit */
+ if (v1 < v2)
+ crval |= 8;
+ else if (v1 > v2)
+ crval |= 4;
+ else
+ crval |= 2;
+ shift = (7 - crfld) * 4;
+ regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
+}
+
+static void __kprobes do_cmp_unsigned(struct pt_regs *regs, unsigned long v1,
+ unsigned long v2, int crfld)
+{
+ unsigned int crval, shift;
+
+ crval = (regs->xer >> 31) & 1; /* get SO bit */
+ if (v1 < v2)
+ crval |= 8;
+ else if (v1 > v2)
+ crval |= 4;
+ else
+ crval |= 2;
+ shift = (7 - crfld) * 4;
+ regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
+}
+
+/*
+ * Elements of 32-bit rotate and mask instructions.
+ */
+#define MASK32(mb, me) ((0xffffffffUL >> (mb)) + \
+ ((signed long)-0x80000000L >> (me)) + ((me) >= (mb)))
+#ifdef __powerpc64__
+#define MASK64_L(mb) (~0UL >> (mb))
+#define MASK64_R(me) ((signed long)-0x8000000000000000L >> (me))
+#define MASK64(mb, me) (MASK64_L(mb) + MASK64_R(me) + ((me) >= (mb)))
+#define DATA32(x) (((x) & 0xffffffffUL) | (((x) & 0xffffffffUL) << 32))
+#else
+#define DATA32(x) (x)
+#endif
+#define ROTATE(x, n) ((n) ? (((x) << (n)) | ((x) >> (8 * sizeof(long) - (n)))) : (x))
+
+/*
+ * Emulate instructions that cause a transfer of control,
+ * loads and stores, and a few other instructions.
* Returns 1 if the step was emulated, 0 if not,
* or -1 if the instruction is one that should not be stepped,
* such as an rfid, or a mtmsrd that would clear MSR_RI.
*/
int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
{
- unsigned int opcode, rs, rb, rd, spr;
+ unsigned int opcode, ra, rb, rd, spr, u;
unsigned long int imm;
+ unsigned long int val, val2;
+ unsigned long int ea;
+ unsigned int cr, mb, me, sh;
+ int err;
+ unsigned long old_ra;
+ long ival;
opcode = instr >> 26;
switch (opcode) {
@@ -78,7 +580,13 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
* entry code works. If that is changed, this will
* need to be changed also.
*/
+ if (regs->gpr[0] == 0x1ebe &&
+ cpu_has_feature(CPU_FTR_REAL_LE)) {
+ regs->msr ^= MSR_LE;
+ goto instr_done;
+ }
regs->gpr[9] = regs->gpr[13];
+ regs->gpr[10] = MSR_KERNEL;
regs->gpr[11] = regs->nip + 4;
regs->gpr[12] = regs->msr & MSR_MASK;
regs->gpr[13] = (unsigned long) get_paca();
@@ -102,9 +610,9 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
regs->nip = imm;
return 1;
case 19:
- switch (instr & 0x7fe) {
- case 0x20: /* bclr */
- case 0x420: /* bcctr */
+ switch ((instr >> 1) & 0x3ff) {
+ case 16: /* bclr */
+ case 528: /* bcctr */
imm = (instr & 0x400)? regs->ctr: regs->link;
regs->nip += 4;
if ((regs->msr & MSR_SF) == 0) {
@@ -116,30 +624,233 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
if (branch_taken(instr, regs))
regs->nip = imm;
return 1;
- case 0x24: /* rfid, scary */
+
+ case 18: /* rfid, scary */
return -1;
+
+ case 150: /* isync */
+ isync();
+ goto instr_done;
+
+ case 33: /* crnor */
+ case 129: /* crandc */
+ case 193: /* crxor */
+ case 225: /* crnand */
+ case 257: /* crand */
+ case 289: /* creqv */
+ case 417: /* crorc */
+ case 449: /* cror */
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+ rd = (instr >> 21) & 0x1f;
+ ra = (regs->ccr >> (31 - ra)) & 1;
+ rb = (regs->ccr >> (31 - rb)) & 1;
+ val = (instr >> (6 + ra * 2 + rb)) & 1;
+ regs->ccr = (regs->ccr & ~(1UL << (31 - rd))) |
+ (val << (31 - rd));
+ goto instr_done;
+ }
+ break;
+ case 31:
+ switch ((instr >> 1) & 0x3ff) {
+ case 598: /* sync */
+#ifdef __powerpc64__
+ switch ((instr >> 21) & 3) {
+ case 1: /* lwsync */
+ asm volatile("lwsync" : : : "memory");
+ goto instr_done;
+ case 2: /* ptesync */
+ asm volatile("ptesync" : : : "memory");
+ goto instr_done;
+ }
+#endif
+ mb();
+ goto instr_done;
+
+ case 854: /* eieio */
+ eieio();
+ goto instr_done;
+ }
+ break;
+ }
+
+ /* Following cases refer to regs->gpr[], so we need all regs */
+ if (!FULL_REGS(regs))
+ return 0;
+
+ rd = (instr >> 21) & 0x1f;
+ ra = (instr >> 16) & 0x1f;
+ rb = (instr >> 11) & 0x1f;
+
+ switch (opcode) {
+ case 7: /* mulli */
+ regs->gpr[rd] = regs->gpr[ra] * (short) instr;
+ goto instr_done;
+
+ case 8: /* subfic */
+ imm = (short) instr;
+ add_with_carry(regs, rd, ~regs->gpr[ra], imm, 1);
+ goto instr_done;
+
+ case 10: /* cmpli */
+ imm = (unsigned short) instr;
+ val = regs->gpr[ra];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0)
+ val = (unsigned int) val;
+#endif
+ do_cmp_unsigned(regs, val, imm, rd >> 2);
+ goto instr_done;
+
+ case 11: /* cmpi */
+ imm = (short) instr;
+ val = regs->gpr[ra];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0)
+ val = (int) val;
+#endif
+ do_cmp_signed(regs, val, imm, rd >> 2);
+ goto instr_done;
+
+ case 12: /* addic */
+ imm = (short) instr;
+ add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
+ goto instr_done;
+
+ case 13: /* addic. */
+ imm = (short) instr;
+ add_with_carry(regs, rd, regs->gpr[ra], imm, 0);
+ set_cr0(regs, rd);
+ goto instr_done;
+
+ case 14: /* addi */
+ imm = (short) instr;
+ if (ra)
+ imm += regs->gpr[ra];
+ regs->gpr[rd] = imm;
+ goto instr_done;
+
+ case 15: /* addis */
+ imm = ((short) instr) << 16;
+ if (ra)
+ imm += regs->gpr[ra];
+ regs->gpr[rd] = imm;
+ goto instr_done;
+
+ case 20: /* rlwimi */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ imm = MASK32(mb, me);
+ regs->gpr[ra] = (regs->gpr[ra] & ~imm) | (ROTATE(val, rb) & imm);
+ goto logical_done;
+
+ case 21: /* rlwinm */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
+ goto logical_done;
+
+ case 23: /* rlwnm */
+ mb = (instr >> 6) & 0x1f;
+ me = (instr >> 1) & 0x1f;
+ rb = regs->gpr[rb] & 0x1f;
+ val = DATA32(regs->gpr[rd]);
+ regs->gpr[ra] = ROTATE(val, rb) & MASK32(mb, me);
+ goto logical_done;
+
+ case 24: /* ori */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] | imm;
+ goto instr_done;
+
+ case 25: /* oris */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] | (imm << 16);
+ goto instr_done;
+
+ case 26: /* xori */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] ^ imm;
+ goto instr_done;
+
+ case 27: /* xoris */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] ^ (imm << 16);
+ goto instr_done;
+
+ case 28: /* andi. */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] & imm;
+ set_cr0(regs, ra);
+ goto instr_done;
+
+ case 29: /* andis. */
+ imm = (unsigned short) instr;
+ regs->gpr[ra] = regs->gpr[rd] & (imm << 16);
+ set_cr0(regs, ra);
+ goto instr_done;
+
+#ifdef __powerpc64__
+ case 30: /* rld* */
+ mb = ((instr >> 6) & 0x1f) | (instr & 0x20);
+ val = regs->gpr[rd];
+ if ((instr & 0x10) == 0) {
+ sh = rb | ((instr & 2) << 4);
+ val = ROTATE(val, sh);
+ switch ((instr >> 2) & 3) {
+ case 0: /* rldicl */
+ regs->gpr[ra] = val & MASK64_L(mb);
+ goto logical_done;
+ case 1: /* rldicr */
+ regs->gpr[ra] = val & MASK64_R(mb);
+ goto logical_done;
+ case 2: /* rldic */
+ regs->gpr[ra] = val & MASK64(mb, 63 - sh);
+ goto logical_done;
+ case 3: /* rldimi */
+ imm = MASK64(mb, 63 - sh);
+ regs->gpr[ra] = (regs->gpr[ra] & ~imm) |
+ (val & imm);
+ goto logical_done;
+ }
+ } else {
+ sh = regs->gpr[rb] & 0x3f;
+ val = ROTATE(val, sh);
+ switch ((instr >> 1) & 7) {
+ case 0: /* rldcl */
+ regs->gpr[ra] = val & MASK64_L(mb);
+ goto logical_done;
+ case 1: /* rldcr */
+ regs->gpr[ra] = val & MASK64_R(mb);
+ goto logical_done;
+ }
}
+#endif
+
case 31:
- rd = (instr >> 21) & 0x1f;
- switch (instr & 0x7fe) {
- case 0xa6: /* mfmsr */
+ switch ((instr >> 1) & 0x3ff) {
+ case 83: /* mfmsr */
+ if (regs->msr & MSR_PR)
+ break;
regs->gpr[rd] = regs->msr & MSR_MASK;
- regs->nip += 4;
- if ((regs->msr & MSR_SF) == 0)
- regs->nip &= 0xffffffffUL;
- return 1;
- case 0x124: /* mtmsr */
+ goto instr_done;
+ case 146: /* mtmsr */
+ if (regs->msr & MSR_PR)
+ break;
imm = regs->gpr[rd];
if ((imm & MSR_RI) == 0)
/* can't step mtmsr that would clear MSR_RI */
return -1;
regs->msr = imm;
- regs->nip += 4;
- return 1;
+ goto instr_done;
#ifdef CONFIG_PPC64
- case 0x164: /* mtmsrd */
+ case 178: /* mtmsrd */
/* only MSR_EE and MSR_RI get changed if bit 15 set */
/* mtmsrd doesn't change MSR_HV and MSR_ME */
+ if (regs->msr & MSR_PR)
+ break;
imm = (instr & 0x10000)? 0x8002: 0xefffffffffffefffUL;
imm = (regs->msr & MSR_MASK & ~imm)
| (regs->gpr[rd] & imm);
@@ -147,57 +858,770 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
/* can't step mtmsrd that would clear MSR_RI */
return -1;
regs->msr = imm;
- regs->nip += 4;
- if ((imm & MSR_SF) == 0)
- regs->nip &= 0xffffffffUL;
- return 1;
+ goto instr_done;
#endif
- case 0x26: /* mfcr */
+ case 19: /* mfcr */
regs->gpr[rd] = regs->ccr;
regs->gpr[rd] &= 0xffffffffUL;
- goto mtspr_out;
- case 0x2a6: /* mfspr */
+ goto instr_done;
+
+ case 144: /* mtcrf */
+ imm = 0xf0000000UL;
+ val = regs->gpr[rd];
+ for (sh = 0; sh < 8; ++sh) {
+ if (instr & (0x80000 >> sh))
+ regs->ccr = (regs->ccr & ~imm) |
+ (val & imm);
+ imm >>= 4;
+ }
+ goto instr_done;
+
+ case 339: /* mfspr */
spr = (instr >> 11) & 0x3ff;
switch (spr) {
case 0x20: /* mfxer */
regs->gpr[rd] = regs->xer;
regs->gpr[rd] &= 0xffffffffUL;
- goto mtspr_out;
+ goto instr_done;
case 0x100: /* mflr */
regs->gpr[rd] = regs->link;
- goto mtspr_out;
+ goto instr_done;
case 0x120: /* mfctr */
regs->gpr[rd] = regs->ctr;
- goto mtspr_out;
- }
- break;
- case 0x378: /* orx */
- if (instr & 1)
- break;
- rs = (instr >> 21) & 0x1f;
- rb = (instr >> 11) & 0x1f;
- if (rs == rb) { /* mr */
- rd = (instr >> 16) & 0x1f;
- regs->gpr[rd] = regs->gpr[rs];
- goto mtspr_out;
+ goto instr_done;
}
break;
- case 0x3a6: /* mtspr */
+
+ case 467: /* mtspr */
spr = (instr >> 11) & 0x3ff;
switch (spr) {
case 0x20: /* mtxer */
regs->xer = (regs->gpr[rd] & 0xffffffffUL);
- goto mtspr_out;
+ goto instr_done;
case 0x100: /* mtlr */
regs->link = regs->gpr[rd];
- goto mtspr_out;
+ goto instr_done;
case 0x120: /* mtctr */
regs->ctr = regs->gpr[rd];
-mtspr_out:
- regs->nip += 4;
- return 1;
+ goto instr_done;
}
+ break;
+
+/*
+ * Compare instructions
+ */
+ case 0: /* cmp */
+ val = regs->gpr[ra];
+ val2 = regs->gpr[rb];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0) {
+ /* word (32-bit) compare */
+ val = (int) val;
+ val2 = (int) val2;
+ }
+#endif
+ do_cmp_signed(regs, val, val2, rd >> 2);
+ goto instr_done;
+
+ case 32: /* cmpl */
+ val = regs->gpr[ra];
+ val2 = regs->gpr[rb];
+#ifdef __powerpc64__
+ if ((rd & 1) == 0) {
+ /* word (32-bit) compare */
+ val = (unsigned int) val;
+ val2 = (unsigned int) val2;
+ }
+#endif
+ do_cmp_unsigned(regs, val, val2, rd >> 2);
+ goto instr_done;
+
+/*
+ * Arithmetic instructions
+ */
+ case 8: /* subfc */
+ add_with_carry(regs, rd, ~regs->gpr[ra],
+ regs->gpr[rb], 1);
+ goto arith_done;
+#ifdef __powerpc64__
+ case 9: /* mulhdu */
+ asm("mulhdu %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+#endif
+ case 10: /* addc */
+ add_with_carry(regs, rd, regs->gpr[ra],
+ regs->gpr[rb], 0);
+ goto arith_done;
+
+ case 11: /* mulhwu */
+ asm("mulhwu %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+
+ case 40: /* subf */
+ regs->gpr[rd] = regs->gpr[rb] - regs->gpr[ra];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 73: /* mulhd */
+ asm("mulhd %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+#endif
+ case 75: /* mulhw */
+ asm("mulhw %0,%1,%2" : "=r" (regs->gpr[rd]) :
+ "r" (regs->gpr[ra]), "r" (regs->gpr[rb]));
+ goto arith_done;
+
+ case 104: /* neg */
+ regs->gpr[rd] = -regs->gpr[ra];
+ goto arith_done;
+
+ case 136: /* subfe */
+ add_with_carry(regs, rd, ~regs->gpr[ra], regs->gpr[rb],
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 138: /* adde */
+ add_with_carry(regs, rd, regs->gpr[ra], regs->gpr[rb],
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 200: /* subfze */
+ add_with_carry(regs, rd, ~regs->gpr[ra], 0L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 202: /* addze */
+ add_with_carry(regs, rd, regs->gpr[ra], 0L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 232: /* subfme */
+ add_with_carry(regs, rd, ~regs->gpr[ra], -1L,
+ regs->xer & XER_CA);
+ goto arith_done;
+#ifdef __powerpc64__
+ case 233: /* mulld */
+ regs->gpr[rd] = regs->gpr[ra] * regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 234: /* addme */
+ add_with_carry(regs, rd, regs->gpr[ra], -1L,
+ regs->xer & XER_CA);
+ goto arith_done;
+
+ case 235: /* mullw */
+ regs->gpr[rd] = (unsigned int) regs->gpr[ra] *
+ (unsigned int) regs->gpr[rb];
+ goto arith_done;
+
+ case 266: /* add */
+ regs->gpr[rd] = regs->gpr[ra] + regs->gpr[rb];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 457: /* divdu */
+ regs->gpr[rd] = regs->gpr[ra] / regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 459: /* divwu */
+ regs->gpr[rd] = (unsigned int) regs->gpr[ra] /
+ (unsigned int) regs->gpr[rb];
+ goto arith_done;
+#ifdef __powerpc64__
+ case 489: /* divd */
+ regs->gpr[rd] = (long int) regs->gpr[ra] /
+ (long int) regs->gpr[rb];
+ goto arith_done;
+#endif
+ case 491: /* divw */
+ regs->gpr[rd] = (int) regs->gpr[ra] /
+ (int) regs->gpr[rb];
+ goto arith_done;
+
+
+/*
+ * Logical instructions
+ */
+ case 26: /* cntlzw */
+ asm("cntlzw %0,%1" : "=r" (regs->gpr[ra]) :
+ "r" (regs->gpr[rd]));
+ goto logical_done;
+#ifdef __powerpc64__
+ case 58: /* cntlzd */
+ asm("cntlzd %0,%1" : "=r" (regs->gpr[ra]) :
+ "r" (regs->gpr[rd]));
+ goto logical_done;
+#endif
+ case 28: /* and */
+ regs->gpr[ra] = regs->gpr[rd] & regs->gpr[rb];
+ goto logical_done;
+
+ case 60: /* andc */
+ regs->gpr[ra] = regs->gpr[rd] & ~regs->gpr[rb];
+ goto logical_done;
+
+ case 124: /* nor */
+ regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
+ goto logical_done;
+
+ case 284: /* xor */
+ regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]);
+ goto logical_done;
+
+ case 316: /* xor */
+ regs->gpr[ra] = regs->gpr[rd] ^ regs->gpr[rb];
+ goto logical_done;
+
+ case 412: /* orc */
+ regs->gpr[ra] = regs->gpr[rd] | ~regs->gpr[rb];
+ goto logical_done;
+
+ case 444: /* or */
+ regs->gpr[ra] = regs->gpr[rd] | regs->gpr[rb];
+ goto logical_done;
+
+ case 476: /* nand */
+ regs->gpr[ra] = ~(regs->gpr[rd] & regs->gpr[rb]);
+ goto logical_done;
+
+ case 922: /* extsh */
+ regs->gpr[ra] = (signed short) regs->gpr[rd];
+ goto logical_done;
+
+ case 954: /* extsb */
+ regs->gpr[ra] = (signed char) regs->gpr[rd];
+ goto logical_done;
+#ifdef __powerpc64__
+ case 986: /* extsw */
+ regs->gpr[ra] = (signed int) regs->gpr[rd];
+ goto logical_done;
+#endif
+
+/*
+ * Shift instructions
+ */
+ case 24: /* slw */
+ sh = regs->gpr[rb] & 0x3f;
+ if (sh < 32)
+ regs->gpr[ra] = (regs->gpr[rd] << sh) & 0xffffffffUL;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 536: /* srw */
+ sh = regs->gpr[rb] & 0x3f;
+ if (sh < 32)
+ regs->gpr[ra] = (regs->gpr[rd] & 0xffffffffUL) >> sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 792: /* sraw */
+ sh = regs->gpr[rb] & 0x3f;
+ ival = (signed int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> (sh < 32 ? sh : 31);
+ if (ival < 0 && (sh >= 32 || (ival & ((1 << sh) - 1)) != 0))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+ case 824: /* srawi */
+ sh = rb;
+ ival = (signed int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> sh;
+ if (ival < 0 && (ival & ((1 << sh) - 1)) != 0)
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+#ifdef __powerpc64__
+ case 27: /* sld */
+ sh = regs->gpr[rd] & 0x7f;
+ if (sh < 64)
+ regs->gpr[ra] = regs->gpr[rd] << sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 539: /* srd */
+ sh = regs->gpr[rb] & 0x7f;
+ if (sh < 64)
+ regs->gpr[ra] = regs->gpr[rd] >> sh;
+ else
+ regs->gpr[ra] = 0;
+ goto logical_done;
+
+ case 794: /* srad */
+ sh = regs->gpr[rb] & 0x7f;
+ ival = (signed long int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> (sh < 64 ? sh : 63);
+ if (ival < 0 && (sh >= 64 || (ival & ((1 << sh) - 1)) != 0))
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+
+ case 826: /* sradi with sh_5 = 0 */
+ case 827: /* sradi with sh_5 = 1 */
+ sh = rb | ((instr & 2) << 4);
+ ival = (signed long int) regs->gpr[rd];
+ regs->gpr[ra] = ival >> sh;
+ if (ival < 0 && (ival & ((1 << sh) - 1)) != 0)
+ regs->xer |= XER_CA;
+ else
+ regs->xer &= ~XER_CA;
+ goto logical_done;
+#endif /* __powerpc64__ */
+
+/*
+ * Cache instructions
+ */
+ case 54: /* dcbst */
+ ea = xform_ea(instr, regs, 0);
+ if (!address_ok(regs, ea, 8))
+ return 0;
+ err = 0;
+ __cacheop_user_asmx(ea, err, "dcbst");
+ if (err)
+ return 0;
+ goto instr_done;
+
+ case 86: /* dcbf */
+ ea = xform_ea(instr, regs, 0);
+ if (!address_ok(regs, ea, 8))
+ return 0;
+ err = 0;
+ __cacheop_user_asmx(ea, err, "dcbf");
+ if (err)
+ return 0;
+ goto instr_done;
+
+ case 246: /* dcbtst */
+ if (rd == 0) {
+ ea = xform_ea(instr, regs, 0);
+ prefetchw((void *) ea);
+ }
+ goto instr_done;
+
+ case 278: /* dcbt */
+ if (rd == 0) {
+ ea = xform_ea(instr, regs, 0);
+ prefetch((void *) ea);
+ }
+ goto instr_done;
+
}
+ break;
}
- return 0;
+
+ /*
+ * Following cases are for loads and stores, so bail out
+ * if we're in little-endian mode.
+ */
+ if (regs->msr & MSR_LE)
+ return 0;
+
+ /*
+ * Save register RA in case it's an update form load or store
+ * and the access faults.
+ */
+ old_ra = regs->gpr[ra];
+
+ switch (opcode) {
+ case 31:
+ u = instr & 0x40;
+ switch ((instr >> 1) & 0x3ff) {
+ case 20: /* lwarx */
+ ea = xform_ea(instr, regs, 0);
+ if (ea & 3)
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, ea, 4))
+ goto ldst_done;
+ err = 0;
+ __get_user_asmx(val, ea, err, "lwarx");
+ if (!err)
+ regs->gpr[rd] = val;
+ goto ldst_done;
+
+ case 150: /* stwcx. */
+ ea = xform_ea(instr, regs, 0);
+ if (ea & 3)
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, ea, 4))
+ goto ldst_done;
+ err = 0;
+ __put_user_asmx(regs->gpr[rd], ea, err, "stwcx.", cr);
+ if (!err)
+ regs->ccr = (regs->ccr & 0x0fffffff) |
+ (cr & 0xe0000000) |
+ ((regs->xer >> 3) & 0x10000000);
+ goto ldst_done;
+
+#ifdef __powerpc64__
+ case 84: /* ldarx */
+ ea = xform_ea(instr, regs, 0);
+ if (ea & 7)
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, ea, 8))
+ goto ldst_done;
+ err = 0;
+ __get_user_asmx(val, ea, err, "ldarx");
+ if (!err)
+ regs->gpr[rd] = val;
+ goto ldst_done;
+
+ case 214: /* stdcx. */
+ ea = xform_ea(instr, regs, 0);
+ if (ea & 7)
+ break; /* can't handle misaligned */
+ err = -EFAULT;
+ if (!address_ok(regs, ea, 8))
+ goto ldst_done;
+ err = 0;
+ __put_user_asmx(regs->gpr[rd], ea, err, "stdcx.", cr);
+ if (!err)
+ regs->ccr = (regs->ccr & 0x0fffffff) |
+ (cr & 0xe0000000) |
+ ((regs->xer >> 3) & 0x10000000);
+ goto ldst_done;
+
+ case 21: /* ldx */
+ case 53: /* ldux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 8, regs);
+ goto ldst_done;
+#endif
+
+ case 23: /* lwzx */
+ case 55: /* lwzux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 4, regs);
+ goto ldst_done;
+
+ case 87: /* lbzx */
+ case 119: /* lbzux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 1, regs);
+ goto ldst_done;
+
+#ifdef CONFIG_ALTIVEC
+ case 103: /* lvx */
+ case 359: /* lvxl */
+ if (!(regs->msr & MSR_VEC))
+ break;
+ ea = xform_ea(instr, regs, 0);
+ err = do_vec_load(rd, do_lvx, ea, regs);
+ goto ldst_done;
+
+ case 231: /* stvx */
+ case 487: /* stvxl */
+ if (!(regs->msr & MSR_VEC))
+ break;
+ ea = xform_ea(instr, regs, 0);
+ err = do_vec_store(rd, do_stvx, ea, regs);
+ goto ldst_done;
+#endif /* CONFIG_ALTIVEC */
+
+#ifdef __powerpc64__
+ case 149: /* stdx */
+ case 181: /* stdux */
+ val = regs->gpr[rd];
+ err = write_mem(val, xform_ea(instr, regs, u), 8, regs);
+ goto ldst_done;
+#endif
+
+ case 151: /* stwx */
+ case 183: /* stwux */
+ val = regs->gpr[rd];
+ err = write_mem(val, xform_ea(instr, regs, u), 4, regs);
+ goto ldst_done;
+
+ case 215: /* stbx */
+ case 247: /* stbux */
+ val = regs->gpr[rd];
+ err = write_mem(val, xform_ea(instr, regs, u), 1, regs);
+ goto ldst_done;
+
+ case 279: /* lhzx */
+ case 311: /* lhzux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 2, regs);
+ goto ldst_done;
+
+#ifdef __powerpc64__
+ case 341: /* lwax */
+ case 373: /* lwaux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 4, regs);
+ if (!err)
+ regs->gpr[rd] = (signed int) regs->gpr[rd];
+ goto ldst_done;
+#endif
+
+ case 343: /* lhax */
+ case 375: /* lhaux */
+ err = read_mem(&regs->gpr[rd], xform_ea(instr, regs, u),
+ 2, regs);
+ if (!err)
+ regs->gpr[rd] = (signed short) regs->gpr[rd];
+ goto ldst_done;
+
+ case 407: /* sthx */
+ case 439: /* sthux */
+ val = regs->gpr[rd];
+ err = write_mem(val, xform_ea(instr, regs, u), 2, regs);
+ goto ldst_done;
+
+#ifdef __powerpc64__
+ case 532: /* ldbrx */
+ err = read_mem(&val, xform_ea(instr, regs, 0), 8, regs);
+ if (!err)
+ regs->gpr[rd] = byterev_8(val);
+ goto ldst_done;
+
+#endif
+
+ case 534: /* lwbrx */
+ err = read_mem(&val, xform_ea(instr, regs, 0), 4, regs);
+ if (!err)
+ regs->gpr[rd] = byterev_4(val);
+ goto ldst_done;
+
+ case 535: /* lfsx */
+ case 567: /* lfsux */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = xform_ea(instr, regs, u);
+ err = do_fp_load(rd, do_lfs, ea, 4, regs);
+ goto ldst_done;
+
+ case 599: /* lfdx */
+ case 631: /* lfdux */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = xform_ea(instr, regs, u);
+ err = do_fp_load(rd, do_lfd, ea, 8, regs);
+ goto ldst_done;
+
+ case 663: /* stfsx */
+ case 695: /* stfsux */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = xform_ea(instr, regs, u);
+ err = do_fp_store(rd, do_stfs, ea, 4, regs);
+ goto ldst_done;
+
+ case 727: /* stfdx */
+ case 759: /* stfdux */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = xform_ea(instr, regs, u);
+ err = do_fp_store(rd, do_stfd, ea, 8, regs);
+ goto ldst_done;
+
+#ifdef __powerpc64__
+ case 660: /* stdbrx */
+ val = byterev_8(regs->gpr[rd]);
+ err = write_mem(val, xform_ea(instr, regs, 0), 8, regs);
+ goto ldst_done;
+
+#endif
+ case 662: /* stwbrx */
+ val = byterev_4(regs->gpr[rd]);
+ err = write_mem(val, xform_ea(instr, regs, 0), 4, regs);
+ goto ldst_done;
+
+ case 790: /* lhbrx */
+ err = read_mem(&val, xform_ea(instr, regs, 0), 2, regs);
+ if (!err)
+ regs->gpr[rd] = byterev_2(val);
+ goto ldst_done;
+
+ case 918: /* sthbrx */
+ val = byterev_2(regs->gpr[rd]);
+ err = write_mem(val, xform_ea(instr, regs, 0), 2, regs);
+ goto ldst_done;
+
+#ifdef CONFIG_VSX
+ case 844: /* lxvd2x */
+ case 876: /* lxvd2ux */
+ if (!(regs->msr & MSR_VSX))
+ break;
+ rd |= (instr & 1) << 5;
+ ea = xform_ea(instr, regs, u);
+ err = do_vsx_load(rd, do_lxvd2x, ea, regs);
+ goto ldst_done;
+
+ case 972: /* stxvd2x */
+ case 1004: /* stxvd2ux */
+ if (!(regs->msr & MSR_VSX))
+ break;
+ rd |= (instr & 1) << 5;
+ ea = xform_ea(instr, regs, u);
+ err = do_vsx_store(rd, do_stxvd2x, ea, regs);
+ goto ldst_done;
+
+#endif /* CONFIG_VSX */
+ }
+ break;
+
+ case 32: /* lwz */
+ case 33: /* lwzu */
+ err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 4, regs);
+ goto ldst_done;
+
+ case 34: /* lbz */
+ case 35: /* lbzu */
+ err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 1, regs);
+ goto ldst_done;
+
+ case 36: /* stw */
+ case 37: /* stwu */
+ val = regs->gpr[rd];
+ err = write_mem(val, dform_ea(instr, regs), 4, regs);
+ goto ldst_done;
+
+ case 38: /* stb */
+ case 39: /* stbu */
+ val = regs->gpr[rd];
+ err = write_mem(val, dform_ea(instr, regs), 1, regs);
+ goto ldst_done;
+
+ case 40: /* lhz */
+ case 41: /* lhzu */
+ err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 2, regs);
+ goto ldst_done;
+
+ case 42: /* lha */
+ case 43: /* lhau */
+ err = read_mem(&regs->gpr[rd], dform_ea(instr, regs), 2, regs);
+ if (!err)
+ regs->gpr[rd] = (signed short) regs->gpr[rd];
+ goto ldst_done;
+
+ case 44: /* sth */
+ case 45: /* sthu */
+ val = regs->gpr[rd];
+ err = write_mem(val, dform_ea(instr, regs), 2, regs);
+ goto ldst_done;
+
+ case 46: /* lmw */
+ ra = (instr >> 16) & 0x1f;
+ if (ra >= rd)
+ break; /* invalid form, ra in range to load */
+ ea = dform_ea(instr, regs);
+ do {
+ err = read_mem(&regs->gpr[rd], ea, 4, regs);
+ if (err)
+ return 0;
+ ea += 4;
+ } while (++rd < 32);
+ goto instr_done;
+
+ case 47: /* stmw */
+ ea = dform_ea(instr, regs);
+ do {
+ err = write_mem(regs->gpr[rd], ea, 4, regs);
+ if (err)
+ return 0;
+ ea += 4;
+ } while (++rd < 32);
+ goto instr_done;
+
+ case 48: /* lfs */
+ case 49: /* lfsu */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = dform_ea(instr, regs);
+ err = do_fp_load(rd, do_lfs, ea, 4, regs);
+ goto ldst_done;
+
+ case 50: /* lfd */
+ case 51: /* lfdu */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = dform_ea(instr, regs);
+ err = do_fp_load(rd, do_lfd, ea, 8, regs);
+ goto ldst_done;
+
+ case 52: /* stfs */
+ case 53: /* stfsu */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = dform_ea(instr, regs);
+ err = do_fp_store(rd, do_stfs, ea, 4, regs);
+ goto ldst_done;
+
+ case 54: /* stfd */
+ case 55: /* stfdu */
+ if (!(regs->msr & MSR_FP))
+ break;
+ ea = dform_ea(instr, regs);
+ err = do_fp_store(rd, do_stfd, ea, 8, regs);
+ goto ldst_done;
+
+#ifdef __powerpc64__
+ case 58: /* ld[u], lwa */
+ switch (instr & 3) {
+ case 0: /* ld */
+ err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
+ 8, regs);
+ goto ldst_done;
+ case 1: /* ldu */
+ err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
+ 8, regs);
+ goto ldst_done;
+ case 2: /* lwa */
+ err = read_mem(&regs->gpr[rd], dsform_ea(instr, regs),
+ 4, regs);
+ if (!err)
+ regs->gpr[rd] = (signed int) regs->gpr[rd];
+ goto ldst_done;
+ }
+ break;
+
+ case 62: /* std[u] */
+ val = regs->gpr[rd];
+ switch (instr & 3) {
+ case 0: /* std */
+ err = write_mem(val, dsform_ea(instr, regs), 8, regs);
+ goto ldst_done;
+ case 1: /* stdu */
+ err = write_mem(val, dsform_ea(instr, regs), 8, regs);
+ goto ldst_done;
+ }
+ break;
+#endif /* __powerpc64__ */
+
+ }
+ err = -EINVAL;
+
+ ldst_done:
+ if (err) {
+ regs->gpr[ra] = old_ra;
+ return 0; /* invoke DSI if -EFAULT? */
+ }
+ instr_done:
+ regs->nip += 4;
+#ifdef __powerpc64__
+ if ((regs->msr & MSR_SF) == 0)
+ regs->nip &= 0xffffffffUL;
+#endif
+ return 1;
+
+ logical_done:
+ if (instr & 1)
+ set_cr0(regs, ra);
+ goto instr_done;
+
+ arith_done:
+ if (instr & 1)
+ set_cr0(regs, rd);
+ goto instr_done;
}
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 7a56b22e060..71ed3ce29e1 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -242,6 +242,17 @@ toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type,
}
/*
+ * Function to perform processor-specific cleanup during unregistration
+ */
+__weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
+{
+ /*
+ * A weak stub function here for those archs that don't define
+ * it inside arch/.../kernel/hw_breakpoint.c
+ */
+}
+
+/*
* Contraints to check before allowing this new breakpoint counter:
*
* == Non-pinned counter == (Considered as pinned for now)
@@ -339,6 +350,7 @@ void release_bp_slot(struct perf_event *bp)
{
mutex_lock(&nr_bp_mutex);
+ arch_unregister_hw_breakpoint(bp);
__release_bp_slot(bp);
mutex_unlock(&nr_bp_mutex);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 15:01:59 +0000