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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c578455a3e
This patch removes the arch-specific fault/trap-infos from thread and
skas-regs.
It adds a new struct faultinfo, that is arch-specific defined in
sysdep/faultinfo.h.
The structure is inserted in thread.arch and thread.regs.skas and
thread.regs.tt
Now, segv and other trap-handlers can copy the contents from regs.X.faultinfo
to thread.arch.faultinfo with one simple assignment.
Also, the number of macros necessary is reduced to
FAULT_ADDRESS(struct faultinfo)
extracts the faulting address from faultinfo
FAULT_WRITE(struct faultinfo)
extracts the "is_write" flag
SEGV_IS_FIXABLE(struct faultinfo)
is true for the fixable segvs, i.e. (TRAP == 14)
on i386
UPT_FAULTINFO(regs)
result is (struct faultinfo *) to the faultinfo
in regs->skas.faultinfo
GET_FAULTINFO_FROM_SC(struct faultinfo, struct sigcontext *)
copies the relevant parts of the sigcontext to
struct faultinfo.
On SIGSEGV, call user_signal() instead of handle_segv(), if the architecture
provides the information needed in PTRACE_FAULTINFO, or if PTRACE_FAULTINFO is
missing, because segv-stub will provide the info.
The benefit of the change is, that in case of a non-fixable SIGSEGV, we can
give user processes a SIGSEGV, instead of possibly looping on pagefault
handling.
Since handle_segv() sikked arch_fixup() implicitly by passing ip==0 to segv(),
I changed segv() to call arch_fixup() only, if !is_user.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* Copyright (C) 2002 - 2003 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 <errno.h>
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#include "signal_user.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "task.h"
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#include "sigcontext.h"
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#include "skas.h"
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#include "ptrace_user.h"
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#include "sysdep/ptrace.h"
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#include "sysdep/ptrace_user.h"
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void sig_handler_common_skas(int sig, void *sc_ptr)
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{
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struct sigcontext *sc = sc_ptr;
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struct skas_regs *r;
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struct signal_info *info;
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int save_errno = errno;
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int save_user;
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/* This is done because to allow SIGSEGV to be delivered inside a SEGV
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* handler. This can happen in copy_user, and if SEGV is disabled,
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* the process will die.
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* XXX Figure out why this is better than SA_NODEFER
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*/
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if(sig == SIGSEGV)
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change_sig(SIGSEGV, 1);
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r = &TASK_REGS(get_current())->skas;
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save_user = r->is_user;
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r->is_user = 0;
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if ( sig == SIGFPE || sig == SIGSEGV ||
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sig == SIGBUS || sig == SIGILL ||
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sig == SIGTRAP ) {
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GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
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}
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change_sig(SIGUSR1, 1);
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info = &sig_info[sig];
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if(!info->is_irq) unblock_signals();
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(*info->handler)(sig, (union uml_pt_regs *) r);
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errno = save_errno;
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r->is_user = save_user;
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}
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extern int ptrace_faultinfo;
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void user_signal(int sig, union uml_pt_regs *regs, int pid)
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{
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struct signal_info *info;
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int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
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(sig == SIGILL) || (sig == SIGTRAP));
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regs->skas.is_user = 1;
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if (segv)
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get_skas_faultinfo(pid, ®s->skas.faultinfo);
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info = &sig_info[sig];
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(*info->handler)(sig, regs);
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unblock_signals();
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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