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support PTRACE_SINGLESTEP.

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support debug/int3 exception.
This commit is contained in:
Susumu Komae
2015-01-29 15:48:05 +09:00
committed by postpeta
parent f97f8dbab3
commit bd5f43b119
5 changed files with 95 additions and 3 deletions
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48
arch/x86/kernel/cpu.c
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@@ -107,6 +107,7 @@ void reload_idt(void)
static struct list_head handlers[256 - 32];
extern char page_fault[], general_protection_exception[];
extern char debug_exception[], int3_exception[];
static void init_idt(void)
{
@@ -125,6 +126,9 @@ static void init_idt(void)
set_idt_entry(13, (unsigned long)general_protection_exception);
set_idt_entry(14, (unsigned long)page_fault);
set_idt_entry_trap_gate(1, (unsigned long)debug_exception);
set_idt_entry_trap_gate(3, (unsigned long)int3_exception);
reload_idt();
}
@@ -467,6 +471,50 @@ void gpe_handler(struct x86_regs *regs)
// panic("GPF");
}
void debug_handler(struct x86_regs *regs)
{
unsigned long db6;
int si_code = 0;
struct siginfo info;
#ifdef DEBUG_PRINT_CPU
kprintf("debug exception (err: %lx, %lx:%lx)\n",
regs->error, regs->cs, regs->rip);
arch_show_interrupt_context(regs);
#endif
asm("mov %%db6, %0" :"=r" (db6));
if (db6 & DB6_BS) {
regs->rflags &= ~RFLAGS_TF;
si_code = TRAP_TRACE;
} else if (db6 & (DB6_B3|DB6_B2|DB6_B1|DB6_B0)) {
si_code = TRAP_HWBKPT;
}
memset(&info, '\0', sizeof info);
info.si_code = si_code;
set_signal(SIGTRAP, regs, &info);
check_signal(0, regs);
check_need_resched();
}
void int3_handler(struct x86_regs *regs)
{
struct siginfo info;
#ifdef DEBUG_PRINT_CPU
kprintf("int3 exception (err: %lx, %lx:%lx)\n",
regs->error, regs->cs, regs->rip);
arch_show_interrupt_context(regs);
#endif
memset(&info, '\0', sizeof info);
info.si_code = TRAP_BRKPT;
set_signal(SIGTRAP, regs, &info);
check_signal(0, regs);
check_need_resched();
}
void x86_issue_ipi(unsigned int apicid, unsigned int low)
{
lapic_icr_write(apicid << LAPIC_ICR_ID_SHIFT, low);