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Diffstat (limited to 'payloads/libpayload/arch/x86/exception.c')
-rw-r--r--payloads/libpayload/arch/x86/exception.c152
1 files changed, 76 insertions, 76 deletions
diff --git a/payloads/libpayload/arch/x86/exception.c b/payloads/libpayload/arch/x86/exception.c
index a9a65ca5a2..33bef71e66 100644
--- a/payloads/libpayload/arch/x86/exception.c
+++ b/payloads/libpayload/arch/x86/exception.c
@@ -27,39 +27,27 @@
* SUCH DAMAGE.
*/
+#include <arch/exception.h>
#include <exception.h>
#include <libpayload.h>
#include <stdint.h>
uint8_t exception_stack[0x1000] __attribute__((aligned(8)));
extern void *exception_stack_end;
+extern struct exception_handler_state *exception_handler_state_handoff;
-struct exception_state
+struct exception_handler_state
{
- u32 eax;
- u32 ecx;
- u32 edx;
- u32 ebx;
- u32 esp;
- u32 ebp;
- u32 esi;
- u32 edi;
- u32 eip;
- u32 eflags;
- u32 cs;
- u32 ss;
- u32 ds;
- u32 es;
- u32 fs;
- u32 gs;
+ struct exception_state regs;
u32 error_code;
u32 vector;
} __attribute__((packed));
-struct exception_info
+struct exception_handler_info
{
const char *name;
void (*error_code_printer)(u32 code);
+ exception_hook hook;
};
static void print_segment_error_code(u32 code)
@@ -105,34 +93,34 @@ static void print_raw_error_code(u32 code)
printf("%#x", code);
}
-static struct exception_info exceptions[] = {
- [0] = { .name = "divide by zero" },
- [1] = { .name = "debug" },
- [2] = { .name = "non-maskable-interrupt" },
- [3] = { .name = "breakpoint" },
- [4] = { .name = "overflow" },
- [5] = { .name = "bound range" },
- [6] = { .name = "invalid opcode" },
- [7] = { .name = "device not available" },
- [8] = { .name = "double fault",
- .error_code_printer = &print_raw_error_code },
- [10] = { .name = "invalid tss",
- .error_code_printer = &print_segment_error_code },
- [11] = { .name = "segment not present",
- .error_code_printer = &print_segment_error_code },
- [12] = { .name = "stack",
- .error_code_printer = &print_segment_error_code },
- [13] = { .name = "general protection",
- .error_code_printer = &print_segment_error_code },
- [14] = { .name = "page fault",
- .error_code_printer = &print_page_fault_error_code },
- [16] = { .name = "x87 floating point" },
- [17] = { .name = "alignment check",
- .error_code_printer = &print_raw_error_code },
- [18] = { .name = "machine check" },
- [19] = { .name = "SIMD floating point" },
- [30] = { .name = "security",
- .error_code_printer = &print_raw_error_code },
+static struct exception_handler_info exceptions[EXC_COUNT] = {
+ [EXC_DE] = { .name = "divide by zero" },
+ [EXC_DB] = { .name = "debug" },
+ [EXC_NMI] = { .name = "non-maskable-interrupt" },
+ [EXC_BP] = { .name = "breakpoint" },
+ [EXC_OF] = { .name = "overflow" },
+ [EXC_BR] = { .name = "bound range" },
+ [EXC_UD] = { .name = "invalid opcode" },
+ [EXC_NM] = { .name = "device not available" },
+ [EXC_DF] = { .name = "double fault",
+ .error_code_printer = &print_raw_error_code },
+ [EXC_TS] = { .name = "invalid tss",
+ .error_code_printer = &print_segment_error_code },
+ [EXC_NP] = { .name = "segment not present",
+ .error_code_printer = &print_segment_error_code },
+ [EXC_SS] = { .name = "stack",
+ .error_code_printer = &print_segment_error_code },
+ [EXC_GP] = { .name = "general protection",
+ .error_code_printer = &print_segment_error_code },
+ [EXC_PF] = { .name = "page fault",
+ .error_code_printer = &print_page_fault_error_code },
+ [EXC_MF] = { .name = "x87 floating point" },
+ [EXC_AC] = { .name = "alignment check",
+ .error_code_printer = &print_raw_error_code },
+ [EXC_MC] = { .name = "machine check" },
+ [EXC_XF] = { .name = "SIMD floating point" },
+ [EXC_SX] = { .name = "security",
+ .error_code_printer = &print_raw_error_code },
};
static void dump_stack(uintptr_t addr, size_t bytes)
@@ -150,16 +138,9 @@ static void dump_stack(uintptr_t addr, size_t bytes)
}
}
-void exception_handler(void);
-void exception_handler(void)
+static void dump_exception_state(struct exception_handler_state *state,
+ struct exception_handler_info *info)
{
- struct exception_state *state =
- (void *)((u8 *)exception_stack_end - sizeof(*state));
-
- struct exception_info *info = NULL;
- if (state->vector < ARRAY_SIZE(exceptions))
- info = &exceptions[state->vector];
-
if (info)
printf("Exception %d (%s)\n", state->vector, info->name);
else
@@ -169,31 +150,50 @@ void exception_handler(void)
info->error_code_printer(state->error_code);
printf("\n");
}
- printf("EIP: 0x%08x\n", state->eip);
- printf("CS: 0x%04x\n", state->cs);
- printf("EFLAGS: 0x%08x\n", state->eflags);
- printf("EAX: 0x%08x\n", state->eax);
- printf("ECX: 0x%08x\n", state->ecx);
- printf("EDX: 0x%08x\n", state->edx);
- printf("EBX: 0x%08x\n", state->ebx);
- printf("ESP: 0x%08x\n", state->esp);
- printf("EBP: 0x%08x\n", state->ebp);
- printf("ESI: 0x%08x\n", state->esi);
- printf("EDI: 0x%08x\n", state->edi);
- printf("DS: 0x%04x\n", state->ds);
- printf("ES: 0x%04x\n", state->es);
- printf("SS: 0x%04x\n", state->ss);
- printf("FS: 0x%04x\n", state->fs);
- printf("GS: 0x%04x\n", state->gs);
-
- dump_stack(state->esp, 512);
-
- halt();
+ printf("EIP: 0x%08x\n", state->regs.eip);
+ printf("CS: 0x%04x\n", state->regs.cs);
+ printf("EFLAGS: 0x%08x\n", state->regs.eflags);
+ printf("EAX: 0x%08x\n", state->regs.eax);
+ printf("ECX: 0x%08x\n", state->regs.ecx);
+ printf("EDX: 0x%08x\n", state->regs.edx);
+ printf("EBX: 0x%08x\n", state->regs.ebx);
+ printf("ESP: 0x%08x\n", state->regs.esp);
+ printf("EBP: 0x%08x\n", state->regs.ebp);
+ printf("ESI: 0x%08x\n", state->regs.esi);
+ printf("EDI: 0x%08x\n", state->regs.edi);
+ printf("DS: 0x%04x\n", state->regs.ds);
+ printf("ES: 0x%04x\n", state->regs.es);
+ printf("SS: 0x%04x\n", state->regs.ss);
+ printf("FS: 0x%04x\n", state->regs.fs);
+ printf("GS: 0x%04x\n", state->regs.gs);
+}
+
+void exception_dispatch(void)
+{
+ struct exception_handler_state *state =
+ exception_handler_state_handoff;
+
+ struct exception_handler_info *info = NULL;
+ if (state->vector < EXC_COUNT)
+ info = &exceptions[state->vector];
+
+ if (info && info->hook) {
+ info->hook(state->vector, &state->regs);
+ } else {
+ dump_exception_state(state, info);
+ dump_stack(state->regs.esp, 512);
+ halt();
+ }
}
-void exception_init_asm(void);
void exception_init(void)
{
exception_stack_end = exception_stack + sizeof(exception_stack);
exception_init_asm();
}
+
+void exception_install_hook(int type, exception_hook hook)
+{
+ die_if(type >= EXC_COUNT, "Out of bound exception type %d.\n", type);
+ exceptions[type].hook = hook;
+}
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