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[PATCH] x86_64: make trap information available to die notification handlers

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This adjusts things so that handlers of the die() notifier will have
sufficient information about the trap currently being handled. It also
adjusts the notify_die() prototype to (again) match that of i386.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-01-11 22:42:14 +01:00 committed by Linus Torvalds
parent 5c617cfa64
commit 6e3f361781
4 changed files with 37 additions and 19 deletions
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2
arch/x86_64/kernel/mce.c
View File

@ -169,7 +169,7 @@ void do_machine_check(struct pt_regs * regs, long error_code)
int panicm_found = 0;
if (regs)
notify_die(DIE_NMI, "machine check", regs, error_code, 255, SIGKILL);
notify_die(DIE_NMI, "machine check", regs, error_code, 18, SIGKILL);
if (!banks)
return;

33
arch/x86_64/kernel/traps.c
View File

@ -382,7 +382,7 @@ void __die(const char * str, struct pt_regs * regs, long err)
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
show_registers(regs);
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP ");
@ -421,19 +421,20 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
struct pt_regs * regs, long error_code,
siginfo_t *info)
{
struct task_struct *tsk = current;
conditional_sti(regs);
if (user_mode(regs)) {
struct task_struct *tsk = current;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
if (user_mode(regs)) {
if (exception_trace && unhandled_signal(tsk, signr))
printk(KERN_INFO
"%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid, str,
regs->rip,regs->rsp,error_code);
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
if (info)
force_sig_info(signr, info, tsk);
else
@ -493,19 +494,20 @@ DO_ERROR( 8, SIGSEGV, "double fault", double_fault)
asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
long error_code)
{
struct task_struct *tsk = current;
conditional_sti(regs);
if (user_mode(regs)) {
struct task_struct *tsk = current;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = 13;
if (user_mode(regs)) {
if (exception_trace && unhandled_signal(tsk, SIGSEGV))
printk(KERN_INFO
"%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid,
regs->rip,regs->rsp,error_code);
tsk->thread.error_code = error_code;
tsk->thread.trap_no = 13;
force_sig(SIGSEGV, tsk);
return;
}
@ -568,7 +570,7 @@ asmlinkage void default_do_nmi(struct pt_regs *regs)
reason = get_nmi_reason();
if (!(reason & 0xc0)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 0, SIGINT)
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
== NOTIFY_STOP)
return;
#ifdef CONFIG_X86_LOCAL_APIC
@ -584,7 +586,7 @@ asmlinkage void default_do_nmi(struct pt_regs *regs)
unknown_nmi_error(reason, regs);
return;
}
if (notify_die(DIE_NMI, "nmi", regs, reason, 0, SIGINT) == NOTIFY_STOP)
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
/* AK: following checks seem to be broken on modern chipsets. FIXME */
@ -693,7 +695,7 @@ asmlinkage void __kprobes do_debug(struct pt_regs * regs,
regs->eflags &= ~TF_MASK;
}
static int kernel_math_error(struct pt_regs *regs, char *str)
static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
{
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->rip);
@ -701,8 +703,9 @@ static int kernel_math_error(struct pt_regs *regs, char *str)
regs->rip = fixup->fixup;
return 1;
}
notify_die(DIE_GPF, str, regs, 0, 16, SIGFPE);
notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
/* Illegal floating point operation in the kernel */
current->thread.trap_no = trapnr;
die(str, regs, 0);
return 0;
}
@ -721,7 +724,7 @@ asmlinkage void do_coprocessor_error(struct pt_regs *regs)
conditional_sti(regs);
if (!user_mode(regs) &&
kernel_math_error(regs, "kernel x87 math error"))
kernel_math_error(regs, "kernel x87 math error", 16))
return;
/*
@ -790,7 +793,7 @@ asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
conditional_sti(regs);
if (!user_mode(regs) &&
kernel_math_error(regs, "kernel simd math error"))
kernel_math_error(regs, "kernel simd math error", 19))
return;
/*

8
arch/x86_64/mm/fault.c
View File

@ -222,10 +222,15 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
unsigned long error_code)
{
unsigned long flags = oops_begin();
struct task_struct *tsk;
printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
current->comm, address);
dump_pagetable(address);
tsk = current;
tsk->thread.cr2 = address;
tsk->thread.trap_no = 14;
tsk->thread.error_code = error_code;
__die("Bad pagetable", regs, error_code);
oops_end(flags);
do_exit(SIGKILL);
@ -521,6 +526,9 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
printk_address(regs->rip);
printk("\n");
dump_pagetable(address);
tsk->thread.cr2 = address;
tsk->thread.trap_no = 14;
tsk->thread.error_code = error_code;
__die("Oops", regs, error_code);
/* Executive summary in case the body of the oops scrolled away */
printk(KERN_EMERG "CR2: %016lx\n", address);

13
include/asm-x86_64/kdebug.h
View File

@ -35,9 +35,16 @@ enum die_val {
DIE_PAGE_FAULT,
};
static inline int notify_die(enum die_val val,char *str,struct pt_regs *regs,long err,int trap, int sig)
{
struct die_args args = { .regs=regs, .str=str, .err=err, .trapnr=trap,.signr=sig };
static inline int notify_die(enum die_val val, const char *str,
struct pt_regs *regs, long err, int trap, int sig)
{
struct die_args args = {
.regs = regs,
.str = str,
.err = err,
.trapnr = trap,
.signr = sig
};
return notifier_call_chain(&die_chain, val, &args);
}