aboutsummaryrefslogtreecommitdiff
path: root/arch/m68k/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/kernel/ptrace.c')
-rw-r--r--arch/m68k/kernel/ptrace.c420
1 files changed, 165 insertions, 255 deletions
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
index f4e1e5eb8e1..1bc10e62b9a 100644
--- a/arch/m68k/kernel/ptrace.c
+++ b/arch/m68k/kernel/ptrace.c
@@ -14,17 +14,15 @@
#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>
-#include <linux/config.h>
#include <linux/signal.h>
+#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
-#include <asm/system.h>
#include <asm/processor.h>
/*
@@ -37,7 +35,9 @@
#define SR_MASK 0x001f
/* sets the trace bits. */
-#define TRACE_BITS 0x8000
+#define TRACE_BITS 0xC000
+#define T1_BIT 0x8000
+#define T0_BIT 0x4000
/* Find the stack offset for a register, relative to thread.esp0. */
#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
@@ -46,7 +46,7 @@
/* Mapping from PT_xxx to the stack offset at which the register is
saved. Notice that usp has no stack-slot and needs to be treated
specially (see get_reg/put_reg below). */
-static int regoff[] = {
+static const int regoff[] = {
[0] = PT_REG(d1),
[1] = PT_REG(d2),
[2] = PT_REG(d3),
@@ -77,10 +77,18 @@ static inline long get_reg(struct task_struct *task, int regno)
if (regno == PT_USP)
addr = &task->thread.usp;
- else if (regno < sizeof(regoff)/sizeof(regoff[0]))
+ else if (regno < ARRAY_SIZE(regoff))
addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
else
return 0;
+ /* Need to take stkadj into account. */
+ if (regno == PT_SR || regno == PT_PC) {
+ long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
+ addr = (unsigned long *) ((unsigned long)addr + stkadj);
+ /* The sr is actually a 16 bit register. */
+ if (regno == PT_SR)
+ return *(unsigned short *)addr;
+ }
return *addr;
}
@@ -94,292 +102,177 @@ static inline int put_reg(struct task_struct *task, int regno,
if (regno == PT_USP)
addr = &task->thread.usp;
- else if (regno < sizeof(regoff)/sizeof(regoff[0]))
- addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
+ else if (regno < ARRAY_SIZE(regoff))
+ addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
else
return -1;
+ /* Need to take stkadj into account. */
+ if (regno == PT_SR || regno == PT_PC) {
+ long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
+ addr = (unsigned long *) ((unsigned long)addr + stkadj);
+ /* The sr is actually a 16 bit register. */
+ if (regno == PT_SR) {
+ *(unsigned short *)addr = data;
+ return 0;
+ }
+ }
*addr = data;
return 0;
}
/*
- * Called by kernel/ptrace.c when detaching..
- *
* Make sure the single step bit is not set.
*/
-void ptrace_disable(struct task_struct *child)
+static inline void singlestep_disable(struct task_struct *child)
{
- unsigned long tmp;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
+ unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 0;
- child->thread.work.syscall_trace = 0;
+ clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
}
-asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+/*
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
{
- struct task_struct *child;
- int ret;
+ singlestep_disable(child);
+}
- lock_kernel();
- ret = -EPERM;
- if (request == PTRACE_TRACEME) {
- /* are we already being traced? */
- if (current->ptrace & PT_PTRACED)
- goto out;
- /* set the ptrace bit in the process flags. */
- current->ptrace |= PT_PTRACED;
- ret = 0;
- goto out;
- }
- ret = -ESRCH;
- read_lock(&tasklist_lock);
- child = find_task_by_pid(pid);
- if (child)
- get_task_struct(child);
- read_unlock(&tasklist_lock);
- if (!child)
- goto out;
+void user_enable_single_step(struct task_struct *child)
+{
+ unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
+ put_reg(child, PT_SR, tmp | T1_BIT);
+ set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
+}
- ret = -EPERM;
- if (pid == 1) /* you may not mess with init */
- goto out_tsk;
+#ifdef CONFIG_MMU
+void user_enable_block_step(struct task_struct *child)
+{
+ unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
+ put_reg(child, PT_SR, tmp | T0_BIT);
+}
+#endif
- if (request == PTRACE_ATTACH) {
- ret = ptrace_attach(child);
- goto out_tsk;
- }
+void user_disable_single_step(struct task_struct *child)
+{
+ singlestep_disable(child);
+}
- ret = ptrace_check_attach(child, request == PTRACE_KILL);
- if (ret < 0)
- goto out_tsk;
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ unsigned long tmp;
+ int i, ret = 0;
+ int regno = addr >> 2; /* temporary hack. */
+ unsigned long __user *datap = (unsigned long __user *) data;
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: {
- unsigned long tmp;
- int copied;
-
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
- ret = -EIO;
- if (copied != sizeof(tmp))
- break;
- ret = put_user(tmp,(unsigned long *) data);
- break;
- }
-
/* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
-
- tmp = 0; /* Default return condition */
- addr = addr >> 2; /* temporary hack. */
- ret = -EIO;
- if (addr < 19) {
- tmp = get_reg(child, addr);
- if (addr == PT_SR)
- tmp >>= 16;
- } else if (addr >= 21 && addr < 49) {
- tmp = child->thread.fp[addr - 21];
-#ifdef CONFIG_M68KFPU_EMU
- /* Convert internal fpu reg representation
- * into long double format
- */
- if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
- tmp = ((tmp & 0xffff0000) << 15) |
- ((tmp & 0x0000ffff) << 16);
+ case PTRACE_PEEKUSR:
+ if (addr & 3)
+ goto out_eio;
+
+ if (regno >= 0 && regno < 19) {
+ tmp = get_reg(child, regno);
+ } else if (regno >= 21 && regno < 49) {
+ tmp = child->thread.fp[regno - 21];
+ /* Convert internal fpu reg representation
+ * into long double format
+ */
+ if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
+ tmp = ((tmp & 0xffff0000) << 15) |
+ ((tmp & 0x0000ffff) << 16);
+#ifndef CONFIG_MMU
+ } else if (regno == 49) {
+ tmp = child->mm->start_code;
+ } else if (regno == 50) {
+ tmp = child->mm->start_data;
+ } else if (regno == 51) {
+ tmp = child->mm->end_code;
#endif
- } else
- break;
- ret = put_user(tmp,(unsigned long *) data);
- break;
+ } else
+ goto out_eio;
+ ret = put_user(tmp, datap);
+ break;
+
+ case PTRACE_POKEUSR:
+ /* write the word at location addr in the USER area */
+ if (addr & 3)
+ goto out_eio;
+
+ if (regno == PT_SR) {
+ data &= SR_MASK;
+ data |= get_reg(child, PT_SR) & ~SR_MASK;
}
-
- /* 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 = 0;
- if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
- break;
- ret = -EIO;
- break;
-
- case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
-
- addr = addr >> 2; /* temporary hack. */
-
- if (addr == PT_SR) {
- data &= SR_MASK;
- data <<= 16;
- data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
+ if (regno >= 0 && regno < 19) {
+ if (put_reg(child, regno, data))
+ goto out_eio;
+ } else if (regno >= 21 && regno < 48) {
+ /* Convert long double format
+ * into internal fpu reg representation
+ */
+ if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
+ data <<= 15;
+ data = (data & 0xffff0000) |
+ ((data & 0x0000ffff) >> 1);
}
- if (addr < 19) {
- if (put_reg(child, addr, data))
- break;
- ret = 0;
+ child->thread.fp[regno - 21] = data;
+ } else
+ goto out_eio;
+ break;
+
+ case PTRACE_GETREGS: /* Get all gp regs from the child. */
+ for (i = 0; i < 19; i++) {
+ tmp = get_reg(child, i);
+ ret = put_user(tmp, datap);
+ if (ret)
break;
- }
- if (addr >= 21 && addr < 48)
- {
-#ifdef CONFIG_M68KFPU_EMU
- /* Convert long double format
- * into internal fpu reg representation
- */
- if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
- data = (unsigned long)data << 15;
- data = (data & 0xffff0000) |
- ((data & 0x0000ffff) >> 1);
- }
-#endif
- child->thread.fp[addr - 21] = data;
- ret = 0;
- }
- break;
-
- case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: { /* restart after signal. */
- long tmp;
-
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL) {
- child->thread.work.syscall_trace = ~0;
- } else {
- child->thread.work.syscall_trace = 0;
- }
- child->exit_code = data;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 0;
- wake_up_process(child);
- ret = 0;
- break;
+ datap++;
}
+ 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: {
- long tmp;
-
- ret = 0;
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- break;
- child->exit_code = SIGKILL;
- /* make sure the single step bit is not set. */
- tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 0;
- wake_up_process(child);
- break;
- }
-
- case PTRACE_SINGLESTEP: { /* set the trap flag. */
- long tmp;
-
- ret = -EIO;
- if (!valid_signal(data))
- break;
- child->thread.work.syscall_trace = 0;
- tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp);
- child->thread.work.delayed_trace = 1;
-
- child->exit_code = data;
- /* give it a chance to run. */
- wake_up_process(child);
- ret = 0;
- break;
- }
-
- case PTRACE_DETACH: /* detach a process that was attached. */
- ret = ptrace_detach(child, data);
- break;
-
- case PTRACE_GETREGS: { /* Get all gp regs from the child. */
- int i;
- unsigned long tmp;
- for (i = 0; i < 19; i++) {
- tmp = get_reg(child, i);
- if (i == PT_SR)
- tmp >>= 16;
- if (put_user(tmp, (unsigned long *) data)) {
- ret = -EFAULT;
+ case PTRACE_SETREGS: /* Set all gp regs in the child. */
+ for (i = 0; i < 19; i++) {
+ ret = get_user(tmp, datap);
+ if (ret)
break;
- }
- data += sizeof(long);
- }
- ret = 0;
- break;
- }
-
- case PTRACE_SETREGS: { /* Set all gp regs in the child. */
- int i;
- unsigned long tmp;
- for (i = 0; i < 19; i++) {
- if (get_user(tmp, (unsigned long *) data)) {
- ret = -EFAULT;
- break;
- }
- if (i == PT_SR) {
+ if (i == PT_SR) {
tmp &= SR_MASK;
- tmp <<= 16;
- tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
- }
- put_reg(child, i, tmp);
- data += sizeof(long);
+ tmp |= get_reg(child, PT_SR) & ~SR_MASK;
}
- ret = 0;
- break;
+ put_reg(child, i, tmp);
+ datap++;
}
-
- case PTRACE_GETFPREGS: { /* Get the child FPU state. */
- ret = 0;
- if (copy_to_user((void *)data, &child->thread.fp,
- sizeof(struct user_m68kfp_struct)))
- ret = -EFAULT;
- break;
- }
-
- case PTRACE_SETFPREGS: { /* Set the child FPU state. */
- ret = 0;
- if (copy_from_user(&child->thread.fp, (void *)data,
- sizeof(struct user_m68kfp_struct)))
- ret = -EFAULT;
- break;
- }
-
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
+ break;
+
+ case PTRACE_GETFPREGS: /* Get the child FPU state. */
+ if (copy_to_user(datap, &child->thread.fp,
+ sizeof(struct user_m68kfp_struct)))
+ ret = -EFAULT;
+ break;
+
+ case PTRACE_SETFPREGS: /* Set the child FPU state. */
+ if (copy_from_user(&child->thread.fp, datap,
+ sizeof(struct user_m68kfp_struct)))
+ ret = -EFAULT;
+ break;
+
+ case PTRACE_GET_THREAD_AREA:
+ ret = put_user(task_thread_info(child)->tp_value, datap);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
}
-out_tsk:
- put_task_struct(child);
-out:
- unlock_kernel();
+
return ret;
+out_eio:
+ return -EIO;
}
asmlinkage void syscall_trace(void)
{
- if (!current->thread.work.delayed_trace &&
- !current->thread.work.syscall_trace)
- return;
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
/*
@@ -392,3 +285,20 @@ asmlinkage void syscall_trace(void)
current->exit_code = 0;
}
}
+
+#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
+asmlinkage int syscall_trace_enter(void)
+{
+ int ret = 0;
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ret = tracehook_report_syscall_entry(task_pt_regs(current));
+ return ret;
+}
+
+asmlinkage void syscall_trace_leave(void)
+{
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(task_pt_regs(current), 0);
+}
+#endif /* CONFIG_COLDFIRE */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 03:35:51 +0000