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Code Issues Releases Activity

Stage2: Add exception handlers

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This commit is contained in:
TuxSH 2018-05-21 03:50:53 +02:00
parent c1687905a3
commit bf2c6dff25
5 changed files with 195 additions and 5 deletions
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8
fusee/fusee-primary/src/exception_handlers.c
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@ -1,3 +1,5 @@
#include <inttypes.h>
#include "exception_handlers.h"
#include "lib/driver_utils.h"
#include "utils.h"
@ -37,7 +39,7 @@ void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
uint32_t instr_addr = pc + ((cpsr & 0x20) ? 2 : 4) - CODE_DUMP_SIZE;
printk("Something went wrong...\n");
printk("\nSomething went wrong...\n");
code_dump_size = safecpy(code_dump, (const void *)instr_addr, CODE_DUMP_SIZE);
stack_dump_size = safecpy(stack_dump, (const void *)registers[13], STACK_DUMP_SIZE);
@ -47,11 +49,11 @@ void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
/* Print r0 to pc. */
for (int i = 0; i < 16; i += 2) {
printk("%-7s%08X %-7s%08X\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
printk("%-7s%08"PRIX32" %-7s%08"PRIX32"\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
}
/* Print cpsr. */
printk("%-7s%08X\n", register_names[16], registers[16]);
printk("%-7s%08"PRIX32"\n", register_names[16], registers[16]);
printk("\nCode dump:\n");
hexdump(code_dump, code_dump_size, instr_addr);

64
fusee/fusee-secondary/src/exception_handlers.c Normal file
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@ -0,0 +1,64 @@
#include <inttypes.h>
#include "exception_handlers.h"
#include "lib/driver_utils.h"
#include "utils.h"
#include "display/video_fb.h"
#define CODE_DUMP_SIZE 0x30
#define STACK_DUMP_SIZE 0x60
extern const uint32_t exception_handler_table[];
static const char *exception_names[] = {
"Reset", "Undefined instruction", "SWI", "Prefetch abort", "Data abort", "Reserved", "IRQ", "FIQ",
};
static const char *register_names[] = {
"R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", "R8", "R9", "R10", "R11", "R12",
"SP", "LR", "PC", "CPSR",
};
void setup_exception_handlers(void) {
volatile uint32_t *bpmp_exception_handler_table = (volatile uint32_t *)0x6000F200;
for (int i = 0; i < 8; i++) {
if (exception_handler_table[i] != 0) {
bpmp_exception_handler_table[i] = exception_handler_table[i];
}
}
}
void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
uint8_t code_dump[CODE_DUMP_SIZE];
uint8_t stack_dump[STACK_DUMP_SIZE];
size_t code_dump_size;
size_t stack_dump_size;
uint32_t pc = registers[15];
uint32_t cpsr = registers[16];
uint32_t instr_addr = pc + ((cpsr & 0x20) ? 2 : 4) - CODE_DUMP_SIZE;
printk("\nSomething went wrong...\n");
code_dump_size = safecpy(code_dump, (const void *)instr_addr, CODE_DUMP_SIZE);
stack_dump_size = safecpy(stack_dump, (const void *)registers[13], STACK_DUMP_SIZE);
printk("\nException type: %s\n", exception_names[exception_type]);
printk("\nRegisters:\n\n");
/* Print r0 to pc. */
for (int i = 0; i < 16; i += 2) {
printk("%-7s%08"PRIX32" %-7s%08"PRIX32"\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
}
/* Print cpsr. */
printk("%-7s%08"PRIX32"\n", register_names[16], registers[16]);
printk("\nCode dump:\n");
hexdump(code_dump, code_dump_size, instr_addr);
printk("\nStack dump:\n");
hexdump(stack_dump, stack_dump_size, registers[13]);
printk("\n");
fatal_error("An exception occured!\n");
}

12
fusee/fusee-secondary/src/exception_handlers.h Normal file
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@ -0,0 +1,12 @@
#ifndef FUSEE_EXCEPTION_HANDLERS_H
#define FUSEE_EXCEPTION_HANDLERS_H
#include <stdint.h>
#include <stddef.h>
/* Copies up to len bytes, stops and returns the read length on data fault. */
size_t safecpy(void *dst, const void *src, size_t len);
void setup_exception_handlers(void);
#endif

109
fusee/fusee-secondary/src/exception_handlers_asm.s Normal file
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@ -0,0 +1,109 @@
.macro GEN_USUAL_HANDLER name, index, lr_arm_displ, lr_thumb_displ
_exception_handler_\name:
ldr sp, =_regs
stmia sp!, {r0-r7}
/* Adjust lr to make it point to the location where the exception occured. */
mrs r1, spsr
tst r1, #0x20
subeq lr, lr, #\lr_arm_displ
subne lr, lr, #\lr_thumb_displ
mov r0, sp
mov r1, #\index
b _exception_handler_common
.endm
.section .text.exception_handlers_asm, "ax", %progbits
.arm
.align 4
_exception_handler_common:
mrs r2, spsr
mrs r3, cpsr
/* Mask interrupts. */
orr r3, #0xC0
msr cpsr_cx, r3
/* Switch to the mode that triggered the interrupt, get the remaining regs, switch back. */
ands r4, r2, #0xF
moveq r4, #0xF /* usr => sys */
bic r5, r3, #0xF
orr r5, r4
msr cpsr_c, r5
stmia r0!, {r8-lr}
msr cpsr_c, r3
str lr, [r0], #4
str r2, [r0]
/* Finally, switch to system mode, setting interrupts and clearing the flags; set sp as well. */
msr cpsr_cxsf, #0xDF
ldr sp, =(_exception_handler_stack + 0x1000)
ldr r0, =_regs
bl exception_handler_main
b .
GEN_USUAL_HANDLER undefined_instruction, 1, 4, 2
GEN_USUAL_HANDLER swi, 2, 4, 2
GEN_USUAL_HANDLER prefetch_abort, 3, 4, 4
GEN_USUAL_HANDLER data_abort_normal, 4, 8, 8
GEN_USUAL_HANDLER fiq, 7, 4, 4
_exception_handler_data_abort:
/* Mask interrupts (abort mode). */
msr cpsr_cx, #0xD7
adr sp, safecpy+8
cmp lr, sp
blo _exception_handler_data_abort_normal
adr sp, _safecpy_end+8
cmp lr, sp
bhs _exception_handler_data_abort_normal
/* Set the flags, set r12 to 0 for safecpy, return from exception. */
msr spsr_f, #(1 << 30)
mov r12, #0
subs pc, lr, #4
.global safecpy
.type safecpy, %function
safecpy:
push {r4, lr}
mov r3, #0
movs r12, #1
_safecpy_loop:
ldrb r4, [r1, r3]
cmp r12, #0
beq _safecpy_loop_end
strb r4, [r0, r3]
add r3, #1
cmp r3, r2
blo _safecpy_loop
_safecpy_loop_end:
mov r0, r3
pop {r4, lr}
bx lr /* Need to do that separately on ARMv4. */
_safecpy_end:
.section .rodata.exception_handlers_asm, "a", %progbits
.align 2
.global exception_handler_table
exception_handler_table:
.word 0 /* Reset */
.word _exception_handler_undefined_instruction
.word _exception_handler_swi
.word _exception_handler_prefetch_abort
.word _exception_handler_data_abort
.word 0 /* Reserved */
.word 0 /* IRQ */
.word _exception_handler_fiq
.section .bss.exception_handlers_asm, "w", %nobits
.align 4
_exception_handler_stack: .skip 0x1000
_regs: .skip (4 * 17)

7
fusee/fusee-secondary/src/main.c
View file

@ -5,6 +5,7 @@
#include <malloc.h>
#include "utils.h"
#include "panic.h"
#include "exception_handlers.h"
#include "loader.h"
#include "chainloader.h"
#include "stage2.h"
@ -26,9 +27,11 @@ static void setup_env(void) {
generic_panic();
}
/* Set up exception handlers. */
setup_exception_handlers();
if(switchfs_mount_all() == -1) {
perror("Failed to mount at least one parition");
generic_panic();
fatal_error("Failed to mount at least one parition: %s\n", strerror(errno));
}
/* TODO: What other hardware init should we do here? */