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Jump to the fault handler for GPFs in the debugger.

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If an uncanonical address is accessed a general protection fault will
be raised. When in the debugger, uncanonical address faults should be
handled by the fault handler (if any).
This commit is contained in:
Alex Smith 2012-08-14 16:03:33 +01:00
parent b067b2878b
commit a53cfbf491
1 changed files with 21 additions and 1 deletions
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22
src/system/kernel/arch/x86/64/int.cpp
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@ -10,6 +10,7 @@
#include <boot/kernel_args.h>
#include <cpu.h>
#include <debug.h>
#include <vm/vm.h>
#include <vm/vm_priv.h>
@ -29,6 +30,25 @@ interrupt_handler_function* gInterruptHandlerTable[kInterruptHandlerTableSize];
extern uint8 isr_array[kInterruptHandlerTableSize][16];
static void
x86_64_general_protection_fault(iframe* frame)
{
if (debug_debugger_running()) {
// Handle GPFs if there is a debugger fault handler installed, for
// non-canonical address accesses.
cpu_ent* cpu = &gCPU[smp_get_current_cpu()];
if (cpu->fault_handler != 0) {
debug_set_page_fault_info(0, frame->ip, DEBUG_PAGE_FAULT_NO_INFO);
frame->ip = cpu->fault_handler;
frame->bp = cpu->fault_handler_stack_pointer;
return;
}
}
x86_unexpected_exception(frame);
}
/*! Returns the virtual IDT address for CPU \a cpu. */
void*
x86_get_idt(int32 cpu)
@ -87,7 +107,7 @@ arch_int_init(kernel_args* args)
table[10] = x86_fatal_exception; // Invalid TSS Exception (#TS)
table[11] = x86_fatal_exception; // Segment Not Present (#NP)
table[12] = x86_fatal_exception; // Stack Fault Exception (#SS)
table[13] = x86_unexpected_exception; // General Protection Exception (#GP)
table[13] = x86_64_general_protection_fault; // General Protection Exception (#GP)
table[14] = x86_page_fault_exception; // Page-Fault Exception (#PF)
table[16] = x86_unexpected_exception; // x87 FPU Floating-Point Error (#MF)
table[17] = x86_unexpected_exception; // Alignment Check Exception (#AC)