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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-05-27 21:43:41 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 19:23:22 +0530 |
| commit | 16f9afe651e8197fb7ce6df0990d8e2ad779e1af (patch) | |
| tree | c6482028a0ceced44e7e4819f7741c2fd8084e3e /arch/arc/kernel/ptrace.c | |
| parent | 2fa919045b72ec892e17d56f888e6af4260b7629 (diff) | |
| download | linux-16f9afe651e8197fb7ce6df0990d8e2ad779e1af.tar.gz | |
ARC: pt_regs update #3: Remove unused gutter at start of callee_regs
This is trickier than prev two:
* context switching code saves kernel mode callee regs in the format of
struct callee_regs thus needs adjustment. This also reduces the height
of topmost kernel stack frame by 1 word.
* Since kernel stack unwinder is sensitive to height of topmost kernel
stack frame, that needs a word of adjustment too.
ptrace needs a bit of updating since pt_regs now diverges from
user_regs_struct.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/ptrace.c')
| -rw-r--r-- | arch/arc/kernel/ptrace.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c index 6e467e3585b0..333238564b67 100644 --- a/arch/arc/kernel/ptrace.c +++ b/arch/arc/kernel/ptrace.c @@ -48,6 +48,7 @@ static int genregs_get(struct task_struct *target, REG_O_ZERO(pad); REG_O_CHUNK(scratch, callee, ptregs); + REG_O_ZERO(pad2); REG_O_CHUNK(callee, efa, cregs); REG_O_CHUNK(efa, stop_pc, &target->thread.fault_address); @@ -96,8 +97,9 @@ static int genregs_set(struct task_struct *target, offsetof(struct user_regs_struct, LOC) + 4); REG_IGNORE_ONE(pad); - /* TBD: disallow updates to STATUS32, orig_r8 etc*/ - REG_IN_CHUNK(scratch, callee, ptregs); /* pt_regs[bta..orig_r8] */ + /* TBD: disallow updates to STATUS32 etc*/ + REG_IN_CHUNK(scratch, pad2, ptregs); /* pt_regs[bta..sp] */ + REG_IGNORE_ONE(pad2); REG_IN_CHUNK(callee, efa, cregs); /* callee_regs[r25..r13] */ REG_IGNORE_ONE(efa); /* efa update invalid */ REG_IN_ONE(stop_pc, &ptregs->ret); /* stop_pc: PC update */ |