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

@@ -29,19 +29,27 @@
#include <arch/cache.h> #include <arch/cache.h>
#include <arch/exception.h> #include <arch/exception.h>
#include <exception.h>
#include <libpayload.h> #include <libpayload.h>
#include <stdint.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; extern void *exception_stack_end;
void exception_undefined_instruction(uint32_t *); struct exception_handler_info
void exception_software_interrupt(uint32_t *); {
void exception_prefetch_abort(uint32_t *); const char *name;
void exception_data_abort(uint32_t *); exception_hook hook;
void exception_not_used(uint32_t *); };
void exception_irq(uint32_t *);
void exception_fiq(uint32_t *); 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) 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"); if (idx >= EXC_COUNT) {
print_regs(regs); printf("Bad exception index %d.\n", idx);
dump_stack(regs[13], 512); } else {
halt(); struct exception_handler_info *info = &exceptions[idx];
} if (info->hook) {
info->hook(idx, state);
return;
}
void exception_software_interrupt(uint32_t *regs) if (info->name)
{ printf("exception %s\n", info->name);
printf("exception _software_interrupt\n"); else
print_regs(regs); printf("exception _not_used.\n");
dump_stack(regs[13], 512); }
halt(); print_regs(state->regs);
} dump_stack(state->regs[13], 512);
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);
halt(); halt();
} }
@@ -146,3 +120,9 @@ void exception_init(void)
set_vbar((uintptr_t)exception_table); set_vbar((uintptr_t)exception_table);
exception_stack_end = exception_stack + sizeof(exception_stack); 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 b 8f
1: 1:
ldr sp, _not_used mov sp, $0
b exception_common b exception_common
2: 2:
ldr sp, _undefined_instruction mov sp, $1
b exception_common b exception_common
3: 3:
ldr sp, _software_interrupt mov sp, $2
b exception_common b exception_common
4: 4:
ldr sp, _prefetch_abort mov sp, $3
b exception_common b exception_common
5: 5:
ldr sp, _data_abort mov sp, $4
b exception_common b exception_common
6: 6:
ldr sp, _not_used mov sp, $5
b exception_common b exception_common
7: 7:
ldr sp, _irq mov sp, $6
b exception_common b exception_common
8: 8:
ldr sp, _fiq mov sp, $7
b exception_common b exception_common
exception_common: exception_common:
str sp, exception_handler str sp, exception_idx
ldr sp, exception_stack_end ldr sp, exception_stack_end
push { lr } push { lr }
stmfd sp, { sp, lr }^ stmfd sp, { sp, lr }^
sub sp, sp, $8 sub sp, sp, $8
push { r0 - r12 } push { r0 - r12 }
mov r0, sp mov r0, sp
mov lr, pc ldr r1, exception_idx
ldr pc, exception_handler blx exception_dispatch
pop { r0 - r12 } pop { r0 - r12 }
add sp, sp, $8 add sp, sp, $8
ldmfd sp!, { pc }^ ldmfd sp!, { pc }^
.align 2 .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 .global exception_stack_end
exception_stack_end: exception_stack_end:
.word 0 .word 0
exception_handler: exception_idx:
.word 0 .word 0
.thumb .thumb

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

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

136
payloads/libpayload/arch/x86/exception.c
View File

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

13
payloads/libpayload/arch/x86/exception_asm.S
View File

@@ -31,6 +31,9 @@
.global exception_stack_end .global exception_stack_end
exception_stack_end: exception_stack_end:
.long 0 .long 0
.global exception_handler_state_handoff
exception_handler_state_handoff:
.long 0
/* Some temporary variables which are used while saving exception state. */ /* Some temporary variables which are used while saving exception state. */
vector: vector:
@@ -134,11 +137,13 @@ exception_common:
pushl old_eax pushl old_eax
/* /*
* Call the C exception handler. It will find the exception state on * Call the C exception handler. It will find the exception state
* the exception stack. Not passing parameters means we don't have to * using the exception_handler_state_handoff global pointer. Not
* worry about what ABI is being used. * passing parameters means we don't have to worry about what ABI
* is being used.
*/ */
call exception_handler mov %esp, exception_handler_state_handoff
call exception_dispatch
/* /*
* Restore state from the exception state structure, including any * Restore state from the exception state structure, including any

16
payloads/libpayload/include/arm/arch/exception.h
View File

@@ -30,9 +30,23 @@
#ifndef _ARCH_EXCEPTION_H #ifndef _ARCH_EXCEPTION_H
#define _ARCH_EXCEPTION_H #define _ARCH_EXCEPTION_H
#include <exception.h>
#include <stdint.h> #include <stdint.h>
void set_vbar(uint32_t vbar); void set_vbar(uint32_t vbar);
struct exception_state
{
uint32_t regs[16];
} __attribute__((packed));
enum {
EXC_UNDEF = 1,
EXC_SWI = 2,
EXC_PABORT = 3,
EXC_DABORT = 4,
EXC_IRQ = 6,
EXC_FIQ = 7,
EXC_COUNT
};
#endif #endif

5
payloads/libpayload/include/exception.h
View File

@@ -30,8 +30,11 @@
#ifndef _EXCEPTION_H #ifndef _EXCEPTION_H
#define _EXCEPTION_H #define _EXCEPTION_H
#include <stdint.h> #include <arch/exception.h>
typedef void (*exception_hook)(int type, struct exception_state *state);
void exception_init(void); void exception_init(void);
void exception_install_hook(int type, exception_hook hook);
#endif #endif

81
payloads/libpayload/include/x86/arch/exception.h Normal file
View File

@@ -0,0 +1,81 @@
/*
* This file is part of the libpayload project.
*
* Copyright 2013 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_EXCEPTION_H
#define _ARCH_EXCEPTION_H
#include <stdint.h>
void exception_dispatch(void);
void exception_init_asm(void);
struct exception_state
{
uint32_t eax;
uint32_t ecx;
uint32_t edx;
uint32_t ebx;
uint32_t esp;
uint32_t ebp;
uint32_t esi;
uint32_t edi;
uint32_t eip;
uint32_t eflags;
uint32_t cs;
uint32_t ss;
uint32_t ds;
uint32_t es;
uint32_t fs;
uint32_t gs;
} __attribute__((packed));
enum {
EXC_DE = 0, /* Divide by zero */
EXC_DB = 1, /* Debug */
EXC_NMI = 2, /* Non maskable interrupt */
EXC_BP = 3, /* Breakpoint */
EXC_OF = 4, /* Overflow */
EXC_BR = 5, /* Bound range */
EXC_UD = 6, /* Invalid opcode */
EXC_NM = 7, /* Device not available */
EXC_DF = 8, /* Double fault */
EXC_TS = 10, /* Invalid TSS */
EXC_NP = 11, /* Segment not present */
EXC_SS = 12, /* Stack */
EXC_GP = 13, /* General protection */
EXC_PF = 14, /* Page fault */
EXC_MF = 16, /* x87 floating point */
EXC_AC = 17, /* Alignment check */
EXC_MC = 18, /* Machine check */
EXC_XF = 19, /* SIMD floating point */
EXC_SX = 30, /* Security */
EXC_COUNT
};
#endif