mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:56:55 +07:00
fb30d64568
We were missing __volatile__ on some bits of asm in the segfault handlers. On x86_64, this was messing up the move from %rdx to uc because that was moved to after the GET_FAULTINFO_FROM_SC, which changed %rdx. Also changed the other bit of asm and the one in the i386 handler to prevent any similar occurrences. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
33 lines
889 B
C
33 lines
889 B
C
/*
|
|
* Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <sys/select.h> /* The only way I can see to get sigset_t */
|
|
#include <asm/unistd.h>
|
|
#include "uml-config.h"
|
|
#include "sysdep/stub.h"
|
|
#include "sysdep/sigcontext.h"
|
|
#include "sysdep/faultinfo.h"
|
|
|
|
void __attribute__ ((__section__ (".__syscall_stub")))
|
|
stub_segv_handler(int sig)
|
|
{
|
|
struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
|
|
int pid;
|
|
|
|
GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
|
|
sc);
|
|
|
|
pid = stub_syscall0(__NR_getpid);
|
|
stub_syscall2(__NR_kill, pid, SIGUSR1);
|
|
|
|
/* Load pointer to sigcontext into esp, since we need to leave
|
|
* the stack in its original form when we do the sigreturn here, by
|
|
* hand.
|
|
*/
|
|
__asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
|
|
"int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
|
|
}
|