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uml: kernel segfaults should dump proper registers

Telusuri Sumber 
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>
This commit is contained in:
Jeff Dike
2007-05-06 14:51:25 -07:00
committed by Linus Torvalds
orang tua 5d86456d38
melakukan 377fad3acb
6 mengubah file dengan 78 tambahan dan 22 penghapusan
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30
arch/um/sys-x86_64/signal.c
Melihat File

@@ -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)
{