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| author | Jeff Dike <jdike@addtoit.com> | 2007-05-06 14:51:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:13:02 -0700 |
| commit | 377fad3acbb7e94ab9942a74e0d9ede8eeb2f039 (patch) | |
| tree | 0bf8046bb1fa6ccb51df76b56819dee6b6d7487b /arch/um/sys-x86_64/signal.c | |
| parent | 5d86456d3852cb95a38d2b23fe01cede54984ba5 (diff) | |
| download | talos-obmc-linux-377fad3acbb7e94ab9942a74e0d9ede8eeb2f039.tar.gz talos-obmc-linux-377fad3acbb7e94ab9942a74e0d9ede8eeb2f039.zip | |
uml: kernel segfaults should dump proper registers
If there's a segfault inside the kernel, we want a dump of the registers at
the point of the segfault, not the registers at the point of calling panic or
the last userspace registers.
sig_handler_common_skas now uses a static register set in the case of a
SIGSEGV to avoid messing up the process registers if the segfault turns out to
be non-fatal.
The architecture sigcontext-to-pt_regs copying code was repurposed to copy
data out of the SEGV stack frame.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/sys-x86_64/signal.c')
| -rw-r--r-- | arch/um/sys-x86_64/signal.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c index 068006213598..fe8ec04d35bb 100644 --- a/arch/um/sys-x86_64/signal.c +++ b/arch/um/sys-x86_64/signal.c @@ -20,6 +20,36 @@ #include "skas.h" +void copy_sc(union uml_pt_regs *regs, void *from) +{ + struct sigcontext *sc = from; + +#define GETREG(regs, regno, sc, regname) \ + (regs)->skas.regs[(regno) / sizeof(unsigned long)] = (sc)->regname + + GETREG(regs, R8, sc, r8); + GETREG(regs, R9, sc, r9); + GETREG(regs, R10, sc, r10); + GETREG(regs, R11, sc, r11); + GETREG(regs, R12, sc, r12); + GETREG(regs, R13, sc, r13); + GETREG(regs, R14, sc, r14); + GETREG(regs, R15, sc, r15); + GETREG(regs, RDI, sc, rdi); + GETREG(regs, RSI, sc, rsi); + GETREG(regs, RBP, sc, rbp); + GETREG(regs, RBX, sc, rbx); + GETREG(regs, RDX, sc, rdx); + GETREG(regs, RAX, sc, rax); + GETREG(regs, RCX, sc, rcx); + GETREG(regs, RSP, sc, rsp); + GETREG(regs, RIP, sc, rip); + GETREG(regs, EFLAGS, sc, eflags); + GETREG(regs, CS, sc, cs); + +#undef GETREG +} + static int copy_sc_from_user_skas(struct pt_regs *regs, struct sigcontext __user *from) { |
