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@xxxxxxxxxxxxxx> --- This patch is to be applied on top of the ptrace patch in <http://marc.info/?l=linux-m68k&m=124203433410424&w=2>. --- arch/m68k/kernel/entry.S | 6 +++++- arch/m68k/kernel/ptrace.c | 45 +++++++++++++++++++++++++++++---------------- 2 files changed, 34 insertions(+), 17 deletions(-) diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 8744f60..521ca1c 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_SR) | clear trace bit in SR diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c index bd08420..1fc217e 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); -- 1.6.3.1 -- Andreas Schwab, schwab@xxxxxxxxxxxxxx GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
