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-rw-r--r--arch/s390/kernel/ptrace.c829
1 files changed, 637 insertions, 192 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 490b39934d6..5dc7ad9e2fb 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -1,32 +1,15 @@
/*
- * arch/s390/kernel/ptrace.c
+ * Ptrace user space interface.
*
- * S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ * Copyright IBM Corp. 1999, 2010
+ * Author(s): Denis Joseph Barrow
* Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Based on PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Derived from "arch/m68k/kernel/ptrace.c"
- * Copyright (C) 1994 by Hamish Macdonald
- * Taken from linux/kernel/ptrace.c and modified for M680x0.
- * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
- *
- * Modified by Cort Dougan (cort@cs.nmt.edu)
- *
- *
- * This file is subject to the terms and conditions of the GNU General
- * Public License. See the file README.legal in the main directory of
- * this archive for more details.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
@@ -37,88 +20,124 @@
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/seccomp.h>
+#include <linux/compat.h>
#include <trace/syscall.h>
-#include <asm/compat.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
+#include <asm/switch_to.h>
#include "entry.h"
#ifdef CONFIG_COMPAT
#include "compat_ptrace.h"
#endif
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
enum s390_regset {
REGSET_GENERAL,
REGSET_FP,
+ REGSET_LAST_BREAK,
+ REGSET_TDB,
+ REGSET_SYSTEM_CALL,
+ REGSET_GENERAL_EXTENDED,
};
-static void
-FixPerRegisters(struct task_struct *task)
+void update_cr_regs(struct task_struct *task)
{
- struct pt_regs *regs;
- per_struct *per_info;
+ struct pt_regs *regs = task_pt_regs(task);
+ struct thread_struct *thread = &task->thread;
+ struct per_regs old, new;
- regs = task_pt_regs(task);
- per_info = (per_struct *) &task->thread.per_info;
- per_info->control_regs.bits.em_instruction_fetch =
- per_info->single_step | per_info->instruction_fetch;
-
- if (per_info->single_step) {
- per_info->control_regs.bits.starting_addr = 0;
-#ifdef CONFIG_COMPAT
- if (is_compat_task())
- per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
+#ifdef CONFIG_64BIT
+ /* Take care of the enable/disable of transactional execution. */
+ if (MACHINE_HAS_TE) {
+ unsigned long cr, cr_new;
+
+ __ctl_store(cr, 0, 0);
+ /* Set or clear transaction execution TXC bit 8. */
+ cr_new = cr | (1UL << 55);
+ if (task->thread.per_flags & PER_FLAG_NO_TE)
+ cr_new &= ~(1UL << 55);
+ if (cr_new != cr)
+ __ctl_load(cr_new, 0, 0);
+ /* Set or clear transaction execution TDC bits 62 and 63. */
+ __ctl_store(cr, 2, 2);
+ cr_new = cr & ~3UL;
+ if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
+ if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
+ cr_new |= 1UL;
+ else
+ cr_new |= 2UL;
+ }
+ if (cr_new != cr)
+ __ctl_load(cr_new, 2, 2);
+ }
+#endif
+ /* Copy user specified PER registers */
+ new.control = thread->per_user.control;
+ new.start = thread->per_user.start;
+ new.end = thread->per_user.end;
+
+ /* merge TIF_SINGLE_STEP into user specified PER registers. */
+ if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) {
+ if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
+ new.control |= PER_EVENT_BRANCH;
else
+ new.control |= PER_EVENT_IFETCH;
+#ifdef CONFIG_64BIT
+ new.control |= PER_CONTROL_SUSPENSION;
+ new.control |= PER_EVENT_TRANSACTION_END;
#endif
- per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN;
- } else {
- per_info->control_regs.bits.starting_addr =
- per_info->starting_addr;
- per_info->control_regs.bits.ending_addr =
- per_info->ending_addr;
+ new.start = 0;
+ new.end = PSW_ADDR_INSN;
}
- /*
- * if any of the control reg tracing bits are on
- * we switch on per in the psw
- */
- if (per_info->control_regs.words.cr[0] & PER_EM_MASK)
- regs->psw.mask |= PSW_MASK_PER;
- else
- regs->psw.mask &= ~PSW_MASK_PER;
- if (per_info->control_regs.bits.em_storage_alteration)
- per_info->control_regs.bits.storage_alt_space_ctl = 1;
- else
- per_info->control_regs.bits.storage_alt_space_ctl = 0;
+ /* Take care of the PER enablement bit in the PSW. */
+ if (!(new.control & PER_EVENT_MASK)) {
+ regs->psw.mask &= ~PSW_MASK_PER;
+ return;
+ }
+ regs->psw.mask |= PSW_MASK_PER;
+ __ctl_store(old, 9, 11);
+ if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
+ __ctl_load(new, 9, 11);
}
void user_enable_single_step(struct task_struct *task)
{
- task->thread.per_info.single_step = 1;
- FixPerRegisters(task);
+ clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
+ set_tsk_thread_flag(task, TIF_SINGLE_STEP);
}
void user_disable_single_step(struct task_struct *task)
{
- task->thread.per_info.single_step = 0;
- FixPerRegisters(task);
+ clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
+ clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
+}
+
+void user_enable_block_step(struct task_struct *task)
+{
+ set_tsk_thread_flag(task, TIF_SINGLE_STEP);
+ set_tsk_thread_flag(task, TIF_BLOCK_STEP);
}
/*
* Called by kernel/ptrace.c when detaching..
*
- * Make sure single step bits etc are not set.
+ * Clear all debugging related fields.
*/
-void
-ptrace_disable(struct task_struct *child)
+void ptrace_disable(struct task_struct *task)
{
- /* make sure the single step bit is not set. */
- user_disable_single_step(child);
+ memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
+ memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
+ clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
+ clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
+ task->thread.per_flags = 0;
}
#ifndef CONFIG_64BIT
@@ -127,6 +146,47 @@ ptrace_disable(struct task_struct *child)
# define __ADDR_MASK 7
#endif
+static inline unsigned long __peek_user_per(struct task_struct *child,
+ addr_t addr)
+{
+ struct per_struct_kernel *dummy = NULL;
+
+ if (addr == (addr_t) &dummy->cr9)
+ /* Control bits of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PER_EVENT_IFETCH : child->thread.per_user.control;
+ else if (addr == (addr_t) &dummy->cr10)
+ /* Start address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ 0 : child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy->cr11)
+ /* End address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PSW_ADDR_INSN : child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy->bits)
+ /* Single-step bit. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ (1UL << (BITS_PER_LONG - 1)) : 0;
+ else if (addr == (addr_t) &dummy->starting_addr)
+ /* Start address of the user specified per set. */
+ return child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy->ending_addr)
+ /* End address of the user specified per set. */
+ return child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy->perc_atmid)
+ /* PER code, ATMID and AI of the last PER trap */
+ return (unsigned long)
+ child->thread.per_event.cause << (BITS_PER_LONG - 16);
+ else if (addr == (addr_t) &dummy->address)
+ /* Address of the last PER trap */
+ return child->thread.per_event.address;
+ else if (addr == (addr_t) &dummy->access_id)
+ /* Access id of the last PER trap */
+ return (unsigned long)
+ child->thread.per_event.paid << (BITS_PER_LONG - 8);
+ return 0;
+}
+
/*
* Read the word at offset addr from the user area of a process. The
* trouble here is that the information is littered over different
@@ -146,9 +206,11 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
* psw and gprs are stored on the stack
*/
tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
- if (addr == (addr_t) &dummy->regs.psw.mask)
- /* Remove per bit from user psw. */
- tmp &= ~PSW_MASK_PER;
+ if (addr == (addr_t) &dummy->regs.psw.mask) {
+ /* Return a clean psw mask. */
+ tmp &= PSW_MASK_USER | PSW_MASK_RI;
+ tmp |= PSW_USER_BITS;
+ }
} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
/*
@@ -187,15 +249,14 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
offset = addr - (addr_t) &dummy->regs.fp_regs;
tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
- tmp &= (unsigned long) FPC_VALID_MASK
- << (BITS_PER_LONG - 32);
+ tmp <<= BITS_PER_LONG - 32;
} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy->regs.per_info;
- tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset);
+ addr -= (addr_t) &dummy->regs.per_info;
+ tmp = __peek_user_per(child, addr);
} else
tmp = 0;
@@ -225,6 +286,35 @@ peek_user(struct task_struct *child, addr_t addr, addr_t data)
return put_user(tmp, (addr_t __user *) data);
}
+static inline void __poke_user_per(struct task_struct *child,
+ addr_t addr, addr_t data)
+{
+ struct per_struct_kernel *dummy = NULL;
+
+ /*
+ * There are only three fields in the per_info struct that the
+ * debugger user can write to.
+ * 1) cr9: the debugger wants to set a new PER event mask
+ * 2) starting_addr: the debugger wants to set a new starting
+ * address to use with the PER event mask.
+ * 3) ending_addr: the debugger wants to set a new ending
+ * address to use with the PER event mask.
+ * The user specified PER event mask and the start and end
+ * addresses are used only if single stepping is not in effect.
+ * Writes to any other field in per_info are ignored.
+ */
+ if (addr == (addr_t) &dummy->cr9)
+ /* PER event mask of the user specified per set. */
+ child->thread.per_user.control =
+ data & (PER_EVENT_MASK | PER_CONTROL_MASK);
+ else if (addr == (addr_t) &dummy->starting_addr)
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == (addr_t) &dummy->ending_addr)
+ /* Ending address of the user specified per set. */
+ child->thread.per_user.end = data;
+}
+
/*
* Write a word to the user area of a process at location addr. This
* operation does have an additional problem compared to peek_user.
@@ -240,19 +330,20 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
/*
* psw and gprs are stored on the stack
*/
- if (addr == (addr_t) &dummy->regs.psw.mask &&
-#ifdef CONFIG_COMPAT
- data != PSW_MASK_MERGE(psw_user32_bits, data) &&
-#endif
- data != PSW_MASK_MERGE(psw_user_bits, data))
- /* Invalid psw mask. */
- return -EINVAL;
-#ifndef CONFIG_64BIT
- if (addr == (addr_t) &dummy->regs.psw.addr)
- /* I'd like to reject addresses without the
- high order bit but older gdb's rely on it */
- data |= PSW_ADDR_AMODE;
-#endif
+ if (addr == (addr_t) &dummy->regs.psw.mask) {
+ unsigned long mask = PSW_MASK_USER;
+
+ mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
+ if ((data ^ PSW_USER_BITS) & ~mask)
+ /* Invalid psw mask. */
+ return -EINVAL;
+ if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
+ /* Invalid address-space-control bits */
+ return -EINVAL;
+ if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
+ /* Invalid addressing mode bits */
+ return -EINVAL;
+ }
*(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
} else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
@@ -290,28 +381,26 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
/*
* floating point regs. are stored in the thread structure
*/
- if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
- (data & ~((unsigned long) FPC_VALID_MASK
- << (BITS_PER_LONG - 32))) != 0)
- return -EINVAL;
+ if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
+ if ((unsigned int) data != 0 ||
+ test_fp_ctl(data >> (BITS_PER_LONG - 32)))
+ return -EINVAL;
offset = addr - (addr_t) &dummy->regs.fp_regs;
*(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy->regs.per_info;
- *(addr_t *)((addr_t) &child->thread.per_info + offset) = data;
+ addr -= (addr_t) &dummy->regs.per_info;
+ __poke_user_per(child, addr, data);
}
- FixPerRegisters(child);
return 0;
}
-static int
-poke_user(struct task_struct *child, addr_t addr, addr_t data)
+static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
{
addr_t mask;
@@ -331,30 +420,17 @@ poke_user(struct task_struct *child, addr_t addr, addr_t data)
return __poke_user(child, addr, data);
}
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
{
ptrace_area parea;
int copied, ret;
switch (request) {
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- /* Remove high order bit from address (only for 31 bit). */
- addr &= PSW_ADDR_INSN;
- /* read word at location addr. */
- return generic_ptrace_peekdata(child, addr, data);
-
case PTRACE_PEEKUSR:
/* read the word at location addr in the USER area. */
return peek_user(child, addr, data);
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- /* Remove high order bit from address (only for 31 bit). */
- addr &= PSW_ADDR_INSN;
- /* write the word at location addr. */
- return generic_ptrace_pokedata(child, addr, data);
-
case PTRACE_POKEUSR:
/* write the word at location addr in the USER area */
return poke_user(child, addr, data);
@@ -384,8 +460,45 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
copied += sizeof(unsigned long);
}
return 0;
+ case PTRACE_GET_LAST_BREAK:
+ put_user(task_thread_info(child)->last_break,
+ (unsigned long __user *) data);
+ return 0;
+ case PTRACE_ENABLE_TE:
+ if (!MACHINE_HAS_TE)
+ return -EIO;
+ child->thread.per_flags &= ~PER_FLAG_NO_TE;
+ return 0;
+ case PTRACE_DISABLE_TE:
+ if (!MACHINE_HAS_TE)
+ return -EIO;
+ child->thread.per_flags |= PER_FLAG_NO_TE;
+ child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
+ return 0;
+ case PTRACE_TE_ABORT_RAND:
+ if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
+ return -EIO;
+ switch (data) {
+ case 0UL:
+ child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
+ break;
+ case 1UL:
+ child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
+ child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
+ break;
+ case 2UL:
+ child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
+ child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+ default:
+ /* Removing high order bit from addr (only for 31 bit). */
+ addr &= PSW_ADDR_INSN;
+ return ptrace_request(child, request, addr, data);
}
- return ptrace_request(child, request, addr, data);
}
#ifdef CONFIG_COMPAT
@@ -404,31 +517,73 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
*/
/*
+ * Same as peek_user_per but for a 31 bit program.
+ */
+static inline __u32 __peek_user_per_compat(struct task_struct *child,
+ addr_t addr)
+{
+ struct compat_per_struct_kernel *dummy32 = NULL;
+
+ if (addr == (addr_t) &dummy32->cr9)
+ /* Control bits of the active per set. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ PER_EVENT_IFETCH : child->thread.per_user.control;
+ else if (addr == (addr_t) &dummy32->cr10)
+ /* Start address of the active per set. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ 0 : child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy32->cr11)
+ /* End address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ PSW32_ADDR_INSN : child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy32->bits)
+ /* Single-step bit. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ 0x80000000 : 0;
+ else if (addr == (addr_t) &dummy32->starting_addr)
+ /* Start address of the user specified per set. */
+ return (__u32) child->thread.per_user.start;
+ else if (addr == (addr_t) &dummy32->ending_addr)
+ /* End address of the user specified per set. */
+ return (__u32) child->thread.per_user.end;
+ else if (addr == (addr_t) &dummy32->perc_atmid)
+ /* PER code, ATMID and AI of the last PER trap */
+ return (__u32) child->thread.per_event.cause << 16;
+ else if (addr == (addr_t) &dummy32->address)
+ /* Address of the last PER trap */
+ return (__u32) child->thread.per_event.address;
+ else if (addr == (addr_t) &dummy32->access_id)
+ /* Access id of the last PER trap */
+ return (__u32) child->thread.per_event.paid << 24;
+ return 0;
+}
+
+/*
* Same as peek_user but for a 31 bit program.
*/
static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
{
- struct user32 *dummy32 = NULL;
- per_struct32 *dummy_per32 = NULL;
+ struct compat_user *dummy32 = NULL;
addr_t offset;
__u32 tmp;
if (addr < (addr_t) &dummy32->regs.acrs) {
+ struct pt_regs *regs = task_pt_regs(child);
/*
* psw and gprs are stored on the stack
*/
if (addr == (addr_t) &dummy32->regs.psw.mask) {
/* Fake a 31 bit psw mask. */
- tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32);
- tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp);
+ tmp = (__u32)(regs->psw.mask >> 32);
+ tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
+ tmp |= PSW32_USER_BITS;
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
/* Fake a 31 bit psw address. */
- tmp = (__u32) task_pt_regs(child)->psw.addr |
- PSW32_ADDR_AMODE31;
+ tmp = (__u32) regs->psw.addr |
+ (__u32)(regs->psw.mask & PSW_MASK_BA);
} else {
/* gpr 0-15 */
- tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw +
- addr*2 + 4);
+ tmp = *(__u32 *)((addr_t) &regs->psw + addr*2 + 4);
}
} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
/*
@@ -459,19 +614,10 @@ static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure
+ * Handle access to the per_info structure.
*/
- offset = addr - (addr_t) &dummy32->regs.per_info;
- /* This is magic. See per_struct and per_struct32. */
- if ((offset >= (addr_t) &dummy_per32->control_regs &&
- offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
- (offset >= (addr_t) &dummy_per32->starting_addr &&
- offset <= (addr_t) &dummy_per32->ending_addr) ||
- offset == (addr_t) &dummy_per32->lowcore.words.address)
- offset = offset*2 + 4;
- else
- offset = offset*2;
- tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset);
+ addr -= (addr_t) &dummy32->regs.per_info;
+ tmp = __peek_user_per_compat(child, addr);
} else
tmp = 0;
@@ -492,35 +638,63 @@ static int peek_user_compat(struct task_struct *child,
}
/*
+ * Same as poke_user_per but for a 31 bit program.
+ */
+static inline void __poke_user_per_compat(struct task_struct *child,
+ addr_t addr, __u32 data)
+{
+ struct compat_per_struct_kernel *dummy32 = NULL;
+
+ if (addr == (addr_t) &dummy32->cr9)
+ /* PER event mask of the user specified per set. */
+ child->thread.per_user.control =
+ data & (PER_EVENT_MASK | PER_CONTROL_MASK);
+ else if (addr == (addr_t) &dummy32->starting_addr)
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == (addr_t) &dummy32->ending_addr)
+ /* Ending address of the user specified per set. */
+ child->thread.per_user.end = data;
+}
+
+/*
* Same as poke_user but for a 31 bit program.
*/
static int __poke_user_compat(struct task_struct *child,
addr_t addr, addr_t data)
{
- struct user32 *dummy32 = NULL;
- per_struct32 *dummy_per32 = NULL;
+ struct compat_user *dummy32 = NULL;
__u32 tmp = (__u32) data;
addr_t offset;
if (addr < (addr_t) &dummy32->regs.acrs) {
+ struct pt_regs *regs = task_pt_regs(child);
/*
* psw, gprs, acrs and orig_gpr2 are stored on the stack
*/
if (addr == (addr_t) &dummy32->regs.psw.mask) {
+ __u32 mask = PSW32_MASK_USER;
+
+ mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
/* Build a 64 bit psw mask from 31 bit mask. */
- if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp))
+ if ((tmp ^ PSW32_USER_BITS) & ~mask)
/* Invalid psw mask. */
return -EINVAL;
- task_pt_regs(child)->psw.mask =
- PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32);
+ if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
+ /* Invalid address-space-control bits */
+ return -EINVAL;
+ regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
+ (regs->psw.mask & PSW_MASK_BA) |
+ (__u64)(tmp & mask) << 32;
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
/* Build a 64 bit psw address from 31 bit address. */
- task_pt_regs(child)->psw.addr =
- (__u64) tmp & PSW32_ADDR_INSN;
+ regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
+ /* Transfer 31 bit amode bit to psw mask. */
+ regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
+ (__u64)(tmp & PSW32_ADDR_AMODE);
} else {
/* gpr 0-15 */
- *(__u32*)((addr_t) &task_pt_regs(child)->psw
- + addr*2 + 4) = tmp;
+ *(__u32*)((addr_t) &regs->psw + addr*2 + 4) = tmp;
}
} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
/*
@@ -547,45 +721,27 @@ static int __poke_user_compat(struct task_struct *child,
* floating point regs. are stored in the thread structure
*/
if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
- (tmp & ~FPC_VALID_MASK) != 0)
- /* Invalid floating point control. */
+ test_fp_ctl(tmp))
return -EINVAL;
offset = addr - (addr_t) &dummy32->regs.fp_regs;
*(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
- * per_info is found in the thread structure.
- */
- offset = addr - (addr_t) &dummy32->regs.per_info;
- /*
- * This is magic. See per_struct and per_struct32.
- * By incident the offsets in per_struct are exactly
- * twice the offsets in per_struct32 for all fields.
- * The 8 byte fields need special handling though,
- * because the second half (bytes 4-7) is needed and
- * not the first half.
+ * Handle access to the per_info structure.
*/
- if ((offset >= (addr_t) &dummy_per32->control_regs &&
- offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
- (offset >= (addr_t) &dummy_per32->starting_addr &&
- offset <= (addr_t) &dummy_per32->ending_addr) ||
- offset == (addr_t) &dummy_per32->lowcore.words.address)
- offset = offset*2 + 4;
- else
- offset = offset*2;
- *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp;
-
+ addr -= (addr_t) &dummy32->regs.per_info;
+ __poke_user_per_compat(child, addr, data);
}
- FixPerRegisters(child);
return 0;
}
static int poke_user_compat(struct task_struct *child,
addr_t addr, addr_t data)
{
- if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3)
+ if (!is_compat_task() || (addr & 3) ||
+ addr > sizeof(struct compat_user) - 3)
return -EIO;
return __poke_user_compat(child, addr, data);
@@ -596,7 +752,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
{
unsigned long addr = caddr;
unsigned long data = cdata;
- ptrace_area_emu31 parea;
+ compat_ptrace_area parea;
int copied, ret;
switch (request) {
@@ -633,6 +789,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
copied += sizeof(unsigned int);
}
return 0;
+ case PTRACE_GET_LAST_BREAK:
+ put_user(task_thread_info(child)->last_break,
+ (unsigned int __user *) data);
+ return 0;
}
return compat_ptrace_request(child, request, addr, data);
}
@@ -640,16 +800,19 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
{
- long ret;
+ long ret = 0;
/* Do the secure computing check first. */
- secure_computing(regs->gprs[2]);
+ if (secure_computing(regs->gprs[2])) {
+ /* seccomp failures shouldn't expose any additional code. */
+ ret = -1;
+ goto out;
+ }
/*
* The sysc_tracesys code in entry.S stored the system
* call number to gprs[2].
*/
- ret = regs->gprs[2];
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
(tracehook_report_syscall_entry(regs) ||
regs->gprs[2] >= NR_syscalls)) {
@@ -658,30 +821,28 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
* debugger stored an invalid system call number. Skip
* the system call and the system call restart handling.
*/
- regs->svcnr = 0;
+ clear_pt_regs_flag(regs, PIF_SYSCALL);
ret = -1;
}
- if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
- ftrace_syscall_enter(regs);
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_enter(regs, regs->gprs[2]);
- if (unlikely(current->audit_context))
- audit_syscall_entry(is_compat_task() ?
- AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
- regs->gprs[2], regs->orig_gpr2,
- regs->gprs[3], regs->gprs[4],
- regs->gprs[5]);
- return ret;
+ audit_syscall_entry(is_compat_task() ?
+ AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
+ regs->gprs[2], regs->orig_gpr2,
+ regs->gprs[3], regs->gprs[4],
+ regs->gprs[5]);
+out:
+ return ret ?: regs->gprs[2];
}
asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
{
- if (unlikely(current->audit_context))
- audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
- regs->gprs[2]);
+ audit_syscall_exit(regs);
- if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
- ftrace_syscall_exit(regs);
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_exit(regs, regs->gprs[2]);
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, 0);
@@ -758,8 +919,10 @@ static int s390_fpregs_get(struct task_struct *target,
const struct user_regset *regset, unsigned int pos,
unsigned int count, void *kbuf, void __user *ubuf)
{
- if (target == current)
- save_fp_regs(&target->thread.fp_regs);
+ if (target == current) {
+ save_fp_ctl(&target->thread.fp_regs.fpc);
+ save_fp_regs(target->thread.fp_regs.fprs);
+ }
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.fp_regs, 0, -1);
@@ -772,19 +935,21 @@ static int s390_fpregs_set(struct task_struct *target,
{
int rc = 0;
- if (target == current)
- save_fp_regs(&target->thread.fp_regs);
+ if (target == current) {
+ save_fp_ctl(&target->thread.fp_regs.fpc);
+ save_fp_regs(target->thread.fp_regs.fprs);
+ }
/* If setting FPC, must validate it first. */
if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
- u32 fpc[2] = { target->thread.fp_regs.fpc, 0 };
- rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc,
+ u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 };
+ rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
0, offsetof(s390_fp_regs, fprs));
if (rc)
return rc;
- if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0)
+ if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
return -EINVAL;
- target->thread.fp_regs.fpc = fpc[0];
+ target->thread.fp_regs.fpc = ufpc[0];
}
if (rc == 0 && count > 0)
@@ -792,12 +957,86 @@ static int s390_fpregs_set(struct task_struct *target,
target->thread.fp_regs.fprs,
offsetof(s390_fp_regs, fprs), -1);
- if (rc == 0 && target == current)
- restore_fp_regs(&target->thread.fp_regs);
+ if (rc == 0 && target == current) {
+ restore_fp_ctl(&target->thread.fp_regs.fpc);
+ restore_fp_regs(target->thread.fp_regs.fprs);
+ }
return rc;
}
+#ifdef CONFIG_64BIT
+
+static int s390_last_break_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ if (count > 0) {
+ if (kbuf) {
+ unsigned long *k = kbuf;
+ *k = task_thread_info(target)->last_break;
+ } else {
+ unsigned long __user *u = ubuf;
+ if (__put_user(task_thread_info(target)->last_break, u))
+ return -EFAULT;
+ }
+ }
+ return 0;
+}
+
+static int s390_last_break_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ return 0;
+}
+
+static int s390_tdb_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ unsigned char *data;
+
+ if (!(regs->int_code & 0x200))
+ return -ENODATA;
+ data = target->thread.trap_tdb;
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
+}
+
+static int s390_tdb_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ return 0;
+}
+
+#endif
+
+static int s390_system_call_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ unsigned int *data = &task_thread_info(target)->system_call;
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ data, 0, sizeof(unsigned int));
+}
+
+static int s390_system_call_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ unsigned int *data = &task_thread_info(target)->system_call;
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ data, 0, sizeof(unsigned int));
+}
+
static const struct user_regset s390_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
@@ -815,6 +1054,32 @@ static const struct user_regset s390_regsets[] = {
.get = s390_fpregs_get,
.set = s390_fpregs_set,
},
+#ifdef CONFIG_64BIT
+ [REGSET_LAST_BREAK] = {
+ .core_note_type = NT_S390_LAST_BREAK,
+ .n = 1,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = s390_last_break_get,
+ .set = s390_last_break_set,
+ },
+ [REGSET_TDB] = {
+ .core_note_type = NT_S390_TDB,
+ .n = 1,
+ .size = 256,
+ .align = 1,
+ .get = s390_tdb_get,
+ .set = s390_tdb_set,
+ },
+#endif
+ [REGSET_SYSTEM_CALL] = {
+ .core_note_type = NT_S390_SYSTEM_CALL,
+ .n = 1,
+ .size = sizeof(unsigned int),
+ .align = sizeof(unsigned int),
+ .get = s390_system_call_get,
+ .set = s390_system_call_set,
+ },
};
static const struct user_regset_view user_s390_view = {
@@ -888,6 +1153,96 @@ static int s390_compat_regs_set(struct task_struct *target,
return rc;
}
+static int s390_compat_regs_high_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ compat_ulong_t *gprs_high;
+
+ gprs_high = (compat_ulong_t *)
+ &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
+ if (kbuf) {
+ compat_ulong_t *k = kbuf;
+ while (count > 0) {
+ *k++ = *gprs_high;
+ gprs_high += 2;
+ count -= sizeof(*k);
+ }
+ } else {
+ compat_ulong_t __user *u = ubuf;
+ while (count > 0) {
+ if (__put_user(*gprs_high, u++))
+ return -EFAULT;
+ gprs_high += 2;
+ count -= sizeof(*u);
+ }
+ }
+ return 0;
+}
+
+static int s390_compat_regs_high_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ compat_ulong_t *gprs_high;
+ int rc = 0;
+
+ gprs_high = (compat_ulong_t *)
+ &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
+ if (kbuf) {
+ const compat_ulong_t *k = kbuf;
+ while (count > 0) {
+ *gprs_high = *k++;
+ *gprs_high += 2;
+ count -= sizeof(*k);
+ }
+ } else {
+ const compat_ulong_t __user *u = ubuf;
+ while (count > 0 && !rc) {
+ unsigned long word;
+ rc = __get_user(word, u++);
+ if (rc)
+ break;
+ *gprs_high = word;
+ *gprs_high += 2;
+ count -= sizeof(*u);
+ }
+ }
+
+ return rc;
+}
+
+static int s390_compat_last_break_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ compat_ulong_t last_break;
+
+ if (count > 0) {
+ last_break = task_thread_info(target)->last_break;
+ if (kbuf) {
+ unsigned long *k = kbuf;
+ *k = last_break;
+ } else {
+ unsigned long __user *u = ubuf;
+ if (__put_user(last_break, u))
+ return -EFAULT;
+ }
+ }
+ return 0;
+}
+
+static int s390_compat_last_break_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ return 0;
+}
+
static const struct user_regset s390_compat_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
@@ -905,6 +1260,38 @@ static const struct user_regset s390_compat_regsets[] = {
.get = s390_fpregs_get,
.set = s390_fpregs_set,
},
+ [REGSET_LAST_BREAK] = {
+ .core_note_type = NT_S390_LAST_BREAK,
+ .n = 1,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = s390_compat_last_break_get,
+ .set = s390_compat_last_break_set,
+ },
+ [REGSET_TDB] = {
+ .core_note_type = NT_S390_TDB,
+ .n = 1,
+ .size = 256,
+ .align = 1,
+ .get = s390_tdb_get,
+ .set = s390_tdb_set,
+ },
+ [REGSET_SYSTEM_CALL] = {
+ .core_note_type = NT_S390_SYSTEM_CALL,
+ .n = 1,
+ .size = sizeof(compat_uint_t),
+ .align = sizeof(compat_uint_t),
+ .get = s390_system_call_get,
+ .set = s390_system_call_set,
+ },
+ [REGSET_GENERAL_EXTENDED] = {
+ .core_note_type = NT_S390_HIGH_GPRS,
+ .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
+ .size = sizeof(compat_long_t),
+ .align = sizeof(compat_long_t),
+ .get = s390_compat_regs_high_get,
+ .set = s390_compat_regs_high_set,
+ },
};
static const struct user_regset_view user_s390_compat_view = {
@@ -923,3 +1310,61 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
#endif
return &user_s390_view;
}
+
+static const char *gpr_names[NUM_GPRS] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+};
+
+unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
+{
+ if (offset >= NUM_GPRS)
+ return 0;
+ return regs->gprs[offset];
+}
+
+int regs_query_register_offset(const char *name)
+{
+ unsigned long offset;
+
+ if (!name || *name != 'r')
+ return -EINVAL;
+ if (kstrtoul(name + 1, 10, &offset))
+ return -EINVAL;
+ if (offset >= NUM_GPRS)
+ return -EINVAL;
+ return offset;
+}
+
+const char *regs_query_register_name(unsigned int offset)
+{
+ if (offset >= NUM_GPRS)
+ return NULL;
+ return gpr_names[offset];
+}
+
+static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
+{
+ unsigned long ksp = kernel_stack_pointer(regs);
+
+ return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs:pt_regs which contains kernel stack pointer.
+ * @n:stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+ unsigned long addr;
+
+ addr = kernel_stack_pointer(regs) + n * sizeof(long);
+ if (!regs_within_kernel_stack(regs, addr))
+ return 0;
+ return *(unsigned long *)addr;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 22:18:38 +0000