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-rw-r--r--arch/sh/kernel/ptrace_32.c578
1 files changed, 413 insertions, 165 deletions
diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
index fddb547f3c2..668c81631c0 100644
--- a/arch/sh/kernel/ptrace_32.c
+++ b/arch/sh/kernel/ptrace_32.c
@@ -1,12 +1,14 @@
/*
- * linux/arch/sh/kernel/ptrace.c
+ * SuperH process tracing
*
- * Original x86 implementation:
- * By Ross Biro 1/23/92
- * edited by Linus Torvalds
+ * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
+ * Copyright (C) 2002 - 2009 Paul Mundt
*
- * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- * Audit support: Yuichi Nakamura <ynakam@hitachisoft.jp>
+ * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
@@ -15,21 +17,24 @@
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
-#include <linux/slab.h>
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/io.h>
#include <linux/audit.h>
+#include <linux/seccomp.h>
+#include <linux/tracehook.h>
+#include <linux/elf.h>
+#include <linux/regset.h>
+#include <linux/hw_breakpoint.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
-#include <asm/system.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
+#include <asm/syscalls.h>
+#include <asm/fpu.h>
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
/*
* This routine will get a word off of the process kernel stack.
@@ -57,21 +62,67 @@ static inline int put_stack_long(struct task_struct *task, int offset,
return 0;
}
-static void ptrace_disable_singlestep(struct task_struct *child)
+void ptrace_triggered(struct perf_event *bp,
+ struct perf_sample_data *data, struct pt_regs *regs)
{
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
+ struct perf_event_attr attr;
/*
- * Ensure the UBC is not programmed at the next context switch.
- *
- * Normally this is not needed but there are sequences such as
- * singlestep, signal delivery, and continue that leave the
- * ubc_pc non-zero leading to spurious SIGTRAPs.
+ * Disable the breakpoint request here since ptrace has defined a
+ * one-shot behaviour for breakpoint exceptions.
*/
- if (child->thread.ubc_pc != 0) {
- ubc_usercnt -= 1;
- child->thread.ubc_pc = 0;
+ attr = bp->attr;
+ attr.disabled = true;
+ modify_user_hw_breakpoint(bp, &attr);
+}
+
+static int set_single_step(struct task_struct *tsk, unsigned long addr)
+{
+ struct thread_struct *thread = &tsk->thread;
+ struct perf_event *bp;
+ struct perf_event_attr attr;
+
+ bp = thread->ptrace_bps[0];
+ if (!bp) {
+ ptrace_breakpoint_init(&attr);
+
+ attr.bp_addr = addr;
+ attr.bp_len = HW_BREAKPOINT_LEN_2;
+ attr.bp_type = HW_BREAKPOINT_R;
+
+ bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
+ NULL, tsk);
+ if (IS_ERR(bp))
+ return PTR_ERR(bp);
+
+ thread->ptrace_bps[0] = bp;
+ } else {
+ int err;
+
+ attr = bp->attr;
+ attr.bp_addr = addr;
+ /* reenable breakpoint */
+ attr.disabled = false;
+ err = modify_user_hw_breakpoint(bp, &attr);
+ if (unlikely(err))
+ return err;
}
+
+ return 0;
+}
+
+void user_enable_single_step(struct task_struct *child)
+{
+ unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
+
+ set_tsk_thread_flag(child, TIF_SINGLESTEP);
+
+ set_single_step(child, pc);
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+ clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
/*
@@ -81,21 +132,248 @@ static void ptrace_disable_singlestep(struct task_struct *child)
*/
void ptrace_disable(struct task_struct *child)
{
- ptrace_disable_singlestep(child);
+ user_disable_single_step(child);
}
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+static int genregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- struct user * dummy = NULL;
+ const struct pt_regs *regs = task_pt_regs(target);
int ret;
- switch (request) {
- /* when I and D space are separate, these will need to be fixed. */
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->regs,
+ 0, 16 * sizeof(unsigned long));
+ if (!ret)
+ /* PC, PR, SR, GBR, MACH, MACL, TRA */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &regs->pc,
+ offsetof(struct pt_regs, pc),
+ sizeof(struct pt_regs));
+ if (!ret)
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_regs), -1);
+
+ return ret;
+}
+
+static int genregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->regs,
+ 0, 16 * sizeof(unsigned long));
+ if (!ret && count > 0)
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &regs->pc,
+ offsetof(struct pt_regs, pc),
+ sizeof(struct pt_regs));
+ if (!ret)
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_regs), -1);
+
+ return ret;
+}
+
+#ifdef CONFIG_SH_FPU
+int fpregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
+
+ if ((boot_cpu_data.flags & CPU_HAS_FPU))
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.xstate->hardfpu, 0, -1);
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &target->thread.xstate->softfpu, 0, -1);
+}
+
+static int fpregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
+
+ set_stopped_child_used_math(target);
+
+ if ((boot_cpu_data.flags & CPU_HAS_FPU))
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.xstate->hardfpu, 0, -1);
+
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &target->thread.xstate->softfpu, 0, -1);
+}
+
+static int fpregs_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ return tsk_used_math(target) ? regset->n : 0;
+}
+#endif
+
+#ifdef CONFIG_SH_DSP
+static int dspregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_dspregs *regs =
+ (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
+ int ret;
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
+ 0, sizeof(struct pt_dspregs));
+ if (!ret)
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_dspregs), -1);
+ return ret;
+}
+
+static int dspregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_dspregs *regs =
+ (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
+ int ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
+ 0, sizeof(struct pt_dspregs));
+ if (!ret)
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_dspregs), -1);
+
+ return ret;
+}
+
+static int dspregs_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+
+ return regs->sr & SR_DSP ? regset->n : 0;
+}
+#endif
+
+const struct pt_regs_offset regoffset_table[] = {
+ REGS_OFFSET_NAME(0),
+ REGS_OFFSET_NAME(1),
+ REGS_OFFSET_NAME(2),
+ REGS_OFFSET_NAME(3),
+ REGS_OFFSET_NAME(4),
+ REGS_OFFSET_NAME(5),
+ REGS_OFFSET_NAME(6),
+ REGS_OFFSET_NAME(7),
+ REGS_OFFSET_NAME(8),
+ REGS_OFFSET_NAME(9),
+ REGS_OFFSET_NAME(10),
+ REGS_OFFSET_NAME(11),
+ REGS_OFFSET_NAME(12),
+ REGS_OFFSET_NAME(13),
+ REGS_OFFSET_NAME(14),
+ REGS_OFFSET_NAME(15),
+ REG_OFFSET_NAME(pc),
+ REG_OFFSET_NAME(pr),
+ REG_OFFSET_NAME(sr),
+ REG_OFFSET_NAME(gbr),
+ REG_OFFSET_NAME(mach),
+ REG_OFFSET_NAME(macl),
+ REG_OFFSET_NAME(tra),
+ REG_OFFSET_END,
+};
+
+/*
+ * These are our native regset flavours.
+ */
+enum sh_regset {
+ REGSET_GENERAL,
+#ifdef CONFIG_SH_FPU
+ REGSET_FPU,
+#endif
+#ifdef CONFIG_SH_DSP
+ REGSET_DSP,
+#endif
+};
+
+static const struct user_regset sh_regsets[] = {
+ /*
+ * Format is:
+ * R0 --> R15
+ * PC, PR, SR, GBR, MACH, MACL, TRA
+ */
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+
+#ifdef CONFIG_SH_FPU
+ [REGSET_FPU] = {
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct user_fpu_struct) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = fpregs_get,
+ .set = fpregs_set,
+ .active = fpregs_active,
+ },
+#endif
+
+#ifdef CONFIG_SH_DSP
+ [REGSET_DSP] = {
+ .n = sizeof(struct pt_dspregs) / sizeof(long),
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = dspregs_get,
+ .set = dspregs_set,
+ .active = dspregs_active,
+ },
+#endif
+};
+
+static const struct user_regset_view user_sh_native_view = {
+ .name = "sh",
+ .e_machine = EM_SH,
+ .regsets = sh_regsets,
+ .n = ARRAY_SIZE(sh_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_sh_native_view;
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ unsigned long __user *datap = (unsigned long __user *)data;
+ int ret;
+
+ switch (request) {
/* read the word at location addr in the USER area. */
case PTRACE_PEEKUSR: {
unsigned long tmp;
@@ -107,30 +385,38 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
if (addr < sizeof(struct pt_regs))
tmp = get_stack_long(child, addr);
- else if (addr >= (long) &dummy->fpu &&
- addr < (long) &dummy->u_fpvalid) {
+ else if (addr >= offsetof(struct user, fpu) &&
+ addr < offsetof(struct user, u_fpvalid)) {
if (!tsk_used_math(child)) {
- if (addr == (long)&dummy->fpu.fpscr)
+ if (addr == offsetof(struct user, fpu.fpscr))
tmp = FPSCR_INIT;
else
tmp = 0;
- } else
- tmp = ((long *)&child->thread.fpu)
- [(addr - (long)&dummy->fpu) >> 2];
- } else if (addr == (long) &dummy->u_fpvalid)
+ } else {
+ unsigned long index;
+ ret = init_fpu(child);
+ if (ret)
+ break;
+ index = addr - offsetof(struct user, fpu);
+ tmp = ((unsigned long *)child->thread.xstate)
+ [index >> 2];
+ }
+ } else if (addr == offsetof(struct user, u_fpvalid))
tmp = !!tsk_used_math(child);
+ else if (addr == PT_TEXT_ADDR)
+ tmp = child->mm->start_code;
+ else if (addr == PT_DATA_ADDR)
+ tmp = child->mm->start_data;
+ else if (addr == PT_TEXT_END_ADDR)
+ tmp = child->mm->end_code;
+ else if (addr == PT_TEXT_LEN)
+ tmp = child->mm->end_code - child->mm->start_code;
else
tmp = 0;
- ret = put_user(tmp, (unsigned long __user *)data);
+ ret = put_user(tmp, datap);
break;
}
- /* when I and D space are separate, this will have to be fixed. */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
ret = -EIO;
if ((addr & 3) || addr < 0 ||
@@ -139,149 +425,111 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
if (addr < sizeof(struct pt_regs))
ret = put_stack_long(child, addr, data);
- else if (addr >= (long) &dummy->fpu &&
- addr < (long) &dummy->u_fpvalid) {
+ else if (addr >= offsetof(struct user, fpu) &&
+ addr < offsetof(struct user, u_fpvalid)) {
+ unsigned long index;
+ ret = init_fpu(child);
+ if (ret)
+ break;
+ index = addr - offsetof(struct user, fpu);
set_stopped_child_used_math(child);
- ((long *)&child->thread.fpu)
- [(addr - (long)&dummy->fpu) >> 2] = data;
+ ((unsigned long *)child->thread.xstate)
+ [index >> 2] = data;
ret = 0;
- } else if (addr == (long) &dummy->u_fpvalid) {
+ } else if (addr == offsetof(struct user, u_fpvalid)) {
conditional_stopped_child_used_math(data, child);
ret = 0;
}
break;
- case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: { /* restart after signal. */
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-
- ptrace_disable_singlestep(child);
-
- child->exit_code = data;
- wake_up_process(child);
- ret = 0;
- break;
- }
-
-/*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- case PTRACE_KILL: {
- ret = 0;
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- break;
- ptrace_disable_singlestep(child);
- child->exit_code = SIGKILL;
- wake_up_process(child);
+ case PTRACE_GETREGS:
+ return copy_regset_to_user(child, &user_sh_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ datap);
+ case PTRACE_SETREGS:
+ return copy_regset_from_user(child, &user_sh_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ datap);
+#ifdef CONFIG_SH_FPU
+ case PTRACE_GETFPREGS:
+ return copy_regset_to_user(child, &user_sh_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct user_fpu_struct),
+ datap);
+ case PTRACE_SETFPREGS:
+ return copy_regset_from_user(child, &user_sh_native_view,
+ REGSET_FPU,
+ 0, sizeof(struct user_fpu_struct),
+ datap);
+#endif
+#ifdef CONFIG_SH_DSP
+ case PTRACE_GETDSPREGS:
+ return copy_regset_to_user(child, &user_sh_native_view,
+ REGSET_DSP,
+ 0, sizeof(struct pt_dspregs),
+ datap);
+ case PTRACE_SETDSPREGS:
+ return copy_regset_from_user(child, &user_sh_native_view,
+ REGSET_DSP,
+ 0, sizeof(struct pt_dspregs),
+ datap);
+#endif
+ default:
+ ret = ptrace_request(child, request, addr, data);
break;
}
- case PTRACE_SINGLESTEP: { /* set the trap flag. */
- long pc;
- struct pt_regs *regs = NULL;
+ return ret;
+}
- ret = -EIO;
- if (!valid_signal(data))
- break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- if ((child->ptrace & PT_DTRACE) == 0) {
- /* Spurious delayed TF traps may occur */
- child->ptrace |= PT_DTRACE;
- }
+static inline int audit_arch(void)
+{
+ int arch = EM_SH;
- pc = get_stack_long(child, (long)&regs->pc);
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
+ arch |= __AUDIT_ARCH_LE;
+#endif
- /* Next scheduling will set up UBC */
- if (child->thread.ubc_pc == 0)
- ubc_usercnt += 1;
- child->thread.ubc_pc = pc;
+ return arch;
+}
- set_tsk_thread_flag(child, TIF_SINGLESTEP);
- child->exit_code = data;
- /* give it a chance to run. */
- wake_up_process(child);
- ret = 0;
- break;
- }
+asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
+{
+ long ret = 0;
-#ifdef CONFIG_SH_DSP
- case PTRACE_GETDSPREGS: {
- unsigned long dp;
+ secure_computing_strict(regs->regs[0]);
- ret = -EIO;
- dp = ((unsigned long) child) + THREAD_SIZE -
- sizeof(struct pt_dspregs);
- if (*((int *) (dp - 4)) == SR_FD) {
- copy_to_user((void *)addr, (void *) dp,
- sizeof(struct pt_dspregs));
- ret = 0;
- }
- break;
- }
+ if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+ tracehook_report_syscall_entry(regs))
+ /*
+ * Tracing decided this syscall should not happen.
+ * We'll return a bogus call number to get an ENOSYS
+ * error, but leave the original number in regs->regs[0].
+ */
+ ret = -1L;
- case PTRACE_SETDSPREGS: {
- unsigned long dp;
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_enter(regs, regs->regs[0]);
- ret = -EIO;
- dp = ((unsigned long) child) + THREAD_SIZE -
- sizeof(struct pt_dspregs);
- if (*((int *) (dp - 4)) == SR_FD) {
- copy_from_user((void *) dp, (void *)addr,
- sizeof(struct pt_dspregs));
- ret = 0;
- }
- break;
- }
-#endif
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
+ audit_syscall_entry(audit_arch(), regs->regs[3],
+ regs->regs[4], regs->regs[5],
+ regs->regs[6], regs->regs[7]);
- return ret;
+ return ret ?: regs->regs[0];
}
-asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
+asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
- struct task_struct *tsk = current;
-
- if (unlikely(current->audit_context) && entryexit)
- audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
- regs->regs[0]);
-
- if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
- !test_thread_flag(TIF_SINGLESTEP))
- goto out;
- if (!(tsk->ptrace & PT_PTRACED))
- goto out;
+ int step;
- /* the 0x80 provides a way for the tracing parent to distinguish
- between a syscall stop and SIGTRAP delivery */
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) &&
- !test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
-
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (tsk->exit_code) {
- send_sig(tsk->exit_code, tsk, 1);
- tsk->exit_code = 0;
- }
+ audit_syscall_exit(regs);
-out:
- if (unlikely(current->audit_context) && !entryexit)
- audit_syscall_entry(AUDIT_ARCH_SH, regs->regs[3],
- regs->regs[4], regs->regs[5],
- regs->regs[6], regs->regs[7]);
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_exit(regs, regs->regs[0]);
+ step = test_thread_flag(TIF_SINGLESTEP);
+ if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, step);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 19:57:24 +0000