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libpayload: Make it possible to install callbacks for particular exceptions.

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To support a GDB stub, it will be necessary to trap various exceptions which
will be used to implement breakpoints, single stepping, etc.

BUG=None
TEST=Built and booted on Link with hooks installed and saw that they
triggered when exceptions occurred. Built and booted on nyan.
BRANCH=None

Original-Change-Id: Iab659365864a3055159a50b8f6e5c44290d3ba2b
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/179602
Original-Reviewed-by: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 8db0897b1ddad600e247cb4df147c757a8187626)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I5e7f724b99988cd259909dd3bd01166fa52317ec
Reviewed-on: http://review.coreboot.org/7656
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Gabe Black
2013-12-11 00:23:15 -08:00
committed by Marc Jones
parent c09cf0b7e1
commit 20cdb2439f
8 changed files with 237 additions and 162 deletions
Download Patch File Download Diff File Expand all files Collapse all files

98
payloads/libpayload/arch/arm/exception.c
View File

@@ -29,19 +29,27 @@
#include <arch/cache.h>
#include <arch/exception.h>
#include <exception.h>
#include <libpayload.h>
#include <stdint.h>
uint8_t exception_stack[0x100] __attribute__((aligned(8)));
uint8_t exception_stack[0x1000] __attribute__((aligned(8)));
extern void *exception_stack_end;
void exception_undefined_instruction(uint32_t *);
void exception_software_interrupt(uint32_t *);
void exception_prefetch_abort(uint32_t *);
void exception_data_abort(uint32_t *);
void exception_not_used(uint32_t *);
void exception_irq(uint32_t *);
void exception_fiq(uint32_t *);
struct exception_handler_info
{
const char *name;
exception_hook hook;
};
static struct exception_handler_info exceptions[EXC_COUNT] = {
[EXC_UNDEF] = { "_undefined_instruction" },
[EXC_SWI] = { "_software_interrupt" },
[EXC_PABORT] = { "_prefetch_abort" },
[EXC_DABORT] = { "_data_abort" },
[EXC_IRQ] = { "_irq" },
[EXC_FIQ] = { "_fiq" },
};
static void dump_stack(uintptr_t addr, size_t bytes)
{
@@ -77,59 +85,25 @@ static void print_regs(uint32_t *regs)
}
}
void exception_undefined_instruction(uint32_t *regs)
void exception_dispatch(struct exception_state *state, int idx);
void exception_dispatch(struct exception_state *state, int idx)
{
printf("exception _undefined_instruction\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
if (idx >= EXC_COUNT) {
printf("Bad exception index %d.\n", idx);
} else {
struct exception_handler_info *info = &exceptions[idx];
if (info->hook) {
info->hook(idx, state);
return;
}
void exception_software_interrupt(uint32_t *regs)
{
printf("exception _software_interrupt\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
void exception_prefetch_abort(uint32_t *regs)
{
printf("exception _prefetch_abort\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
void exception_data_abort(uint32_t *regs)
{
printf("exception _data_abort\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
void exception_not_used(uint32_t *regs)
{
printf("exception _not_used\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
void exception_irq(uint32_t *regs)
{
printf("exception _irq\n");
print_regs(regs);
dump_stack(regs[13], 512);
halt();
}
void exception_fiq(uint32_t *regs)
{
printf("exception _fiq\n");
print_regs(regs);
dump_stack(regs[13], 512);
if (info->name)
printf("exception %s\n", info->name);
else
printf("exception _not_used.\n");
}
print_regs(state->regs);
dump_stack(state->regs[13], 512);
halt();
}
@@ -146,3 +120,9 @@ void exception_init(void)
set_vbar((uintptr_t)exception_table);
exception_stack_end = exception_stack + sizeof(exception_stack);
}
void exception_install_hook(int type, exception_hook hook)
{
die_if(type >= EXC_COUNT, "Out of bounds exception index %d.\n", type);
exceptions[type].hook = hook;
}

32
payloads/libpayload/arch/arm/exception_asm.S
View File

@@ -43,59 +43,51 @@ exception_table:
b 8f
1:
ldr sp, _not_used
mov sp, $0
b exception_common
2:
ldr sp, _undefined_instruction
mov sp, $1
b exception_common
3:
ldr sp, _software_interrupt
mov sp, $2
b exception_common
4:
ldr sp, _prefetch_abort
mov sp, $3
b exception_common
5:
ldr sp, _data_abort
mov sp, $4
b exception_common
6:
ldr sp, _not_used
mov sp, $5
b exception_common
7:
ldr sp, _irq
mov sp, $6
b exception_common
8:
ldr sp, _fiq
mov sp, $7
b exception_common
exception_common:
str sp, exception_handler
str sp, exception_idx
ldr sp, exception_stack_end
push { lr }
stmfd sp, { sp, lr }^
sub sp, sp, $8
push { r0 - r12 }
mov r0, sp
mov lr, pc
ldr pc, exception_handler
ldr r1, exception_idx
blx exception_dispatch
pop { r0 - r12 }
add sp, sp, $8
ldmfd sp!, { pc }^
.align 2
_undefined_instruction: .word exception_undefined_instruction
_software_interrupt: .word exception_software_interrupt
_prefetch_abort: .word exception_prefetch_abort
_data_abort: .word exception_data_abort
_not_used: .word exception_not_used
_irq: .word exception_irq
_fiq: .word exception_fiq
.global exception_stack_end
exception_stack_end:
.word 0
exception_handler:
exception_idx:
.word 0
.thumb

2
payloads/libpayload/arch/arm/main.c
View File

@@ -27,7 +27,7 @@
* SUCH DAMAGE.
*/
#include <arch/exception.h>
#include <exception.h>
#include <libpayload.h>
unsigned int main_argc; /**< The argc value to pass to main() */