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authorAndreas Schwab <schwab@linux-m68k.org>2009-05-19 15:38:01 +0200
committerGeert Uytterhoeven <geert@linux-m68k.org>2009-12-04 21:22:35 +0100
commitf195e2bff3000b8bc251ee6f685e0f027eec6f25 (patch)
tree6a872faedca9f07af26b7ba90551258a10a3bd94 /arch/m68k/kernel
parentfaa47b466935e73251b18b17d51455b06ed65764 (diff)
m68k: ptrace fixes
This fixes the following issues in ptrace: - when single stepping into the signal handler stop at the first insn of the handler - handle non-zero stkadj when accessing pc and sr in ptregs - correctly handle PT_SR in PTRACE_POKEUSR - report -EIO when trying to read unknown offset in PTRACE_PEEKUSR Additionally, the handling of the special case that PT_SR accesses a 16 bit word instead of a 32 bit word has been moved into get_reg/put_reg. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel')
-rw-r--r--arch/m68k/kernel/entry.S6
-rw-r--r--arch/m68k/kernel/ptrace.c45
2 files changed, 34 insertions, 17 deletions
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index c5b33634c980..77fc7c16bf48 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -179,7 +179,11 @@ do_signal_return:
addql #8,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
- jbra resume_userspace
+ tstl %d0
+ jeq resume_userspace
+ | when single stepping into handler stop at the first insn
+ btst #6,%curptr@(TASK_INFO+TINFO_FLAGS+2)
+ jeq resume_userspace
do_delayed_trace:
bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
index bd0842059d11..1fc217e5f06b 100644
--- a/arch/m68k/kernel/ptrace.c
+++ b/arch/m68k/kernel/ptrace.c
@@ -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),
@@ -81,6 +81,14 @@ static inline long get_reg(struct task_struct *task, int regno)
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;
}
@@ -98,6 +106,16 @@ static inline int put_reg(struct task_struct *task, int regno,
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;
}
@@ -107,7 +125,7 @@ static inline int put_reg(struct task_struct *task, int regno,
*/
static inline void singlestep_disable(struct task_struct *child)
{
- unsigned long 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);
clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
}
@@ -122,15 +140,15 @@ void ptrace_disable(struct task_struct *child)
void user_enable_single_step(struct task_struct *child)
{
- unsigned long tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp | (T1_BIT << 16));
+ 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);
}
void user_enable_block_step(struct task_struct *child)
{
- unsigned long tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
- put_reg(child, PT_SR, tmp | (T0_BIT << 16));
+ unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
+ put_reg(child, PT_SR, tmp | T0_BIT);
}
void user_disable_single_step(struct task_struct *child)
@@ -152,8 +170,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
if (addr >= 0 && 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];
/* Convert internal fpu reg representation
@@ -163,7 +179,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
tmp = ((tmp & 0xffff0000) << 15) |
((tmp & 0x0000ffff) << 16);
} else
- break;
+ goto out_eio;
ret = put_user(tmp, (unsigned long *)data);
break;
@@ -174,9 +190,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
if (addr == PT_SR) {
data &= SR_MASK;
- data <<= 16;
- data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
- } else if (addr >= 0 && addr < 19) {
+ data |= get_reg(child, PT_SR) & ~SR_MASK;
+ }
+ if (addr >= 0 && addr < 19) {
if (put_reg(child, addr, data))
goto out_eio;
} else if (addr >= 21 && addr < 48) {
@@ -196,8 +212,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
case PTRACE_GETREGS: /* Get all gp regs from the child. */
for (i = 0; i < 19; i++) {
tmp = get_reg(child, i);
- if (i == PT_SR)
- tmp >>= 16;
ret = put_user(tmp, (unsigned long *)data);
if (ret)
break;
@@ -212,8 +226,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
break;
if (i == PT_SR) {
tmp &= SR_MASK;
- tmp <<= 16;
- tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
+ tmp |= get_reg(child, PT_SR) & ~SR_MASK;
}
put_reg(child, i, tmp);
data += sizeof(long);