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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
/*
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* Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include <signal.h>
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#include <sys/select.h> /* The only way I can see to get sigset_t */
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#include <asm/unistd.h>
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#include "uml-config.h"
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#include "sysdep/stub.h"
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#include "sysdep/sigcontext.h"
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#include "sysdep/faultinfo.h"
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void __attribute__ ((__section__ (".__syscall_stub")))
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stub_segv_handler(int sig)
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{
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struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
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int pid;
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GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
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sc);
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pid = stub_syscall0(__NR_getpid);
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stub_syscall2(__NR_kill, pid, SIGUSR1);
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/* Load pointer to sigcontext into esp, since we need to leave
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* the stack in its original form when we do the sigreturn here, by
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* hand.
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*/
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__asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
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"int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
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}
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