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https://github.com/Atmosphere-NX/Atmosphere
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Stage2: Add exception handlers
This commit is contained in:
TuxSH
parent
c1687905a3
commit
bf2c6dff25
5 changed files with 195 additions and 5 deletions
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@ -1,3 +1,5 @@
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#include <inttypes.h>
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#include "exception_handlers.h"
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#include "lib/driver_utils.h"
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#include "utils.h"
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@ -37,7 +39,7 @@ void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
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uint32_t instr_addr = pc + ((cpsr & 0x20) ? 2 : 4) - CODE_DUMP_SIZE;
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printk("Something went wrong...\n");
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printk("\nSomething went wrong...\n");
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code_dump_size = safecpy(code_dump, (const void *)instr_addr, CODE_DUMP_SIZE);
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stack_dump_size = safecpy(stack_dump, (const void *)registers[13], STACK_DUMP_SIZE);
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@ -47,11 +49,11 @@ void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
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/* Print r0 to pc. */
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for (int i = 0; i < 16; i += 2) {
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printk("%-7s%08X %-7s%08X\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
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printk("%-7s%08"PRIX32" %-7s%08"PRIX32"\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
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}
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/* Print cpsr. */
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printk("%-7s%08X\n", register_names[16], registers[16]);
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printk("%-7s%08"PRIX32"\n", register_names[16], registers[16]);
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printk("\nCode dump:\n");
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hexdump(code_dump, code_dump_size, instr_addr);
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64
fusee/fusee-secondary/src/exception_handlers.c
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64
fusee/fusee-secondary/src/exception_handlers.c
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@ -0,0 +1,64 @@
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#include <inttypes.h>
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#include "exception_handlers.h"
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#include "lib/driver_utils.h"
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#include "utils.h"
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#include "display/video_fb.h"
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#define CODE_DUMP_SIZE 0x30
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#define STACK_DUMP_SIZE 0x60
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extern const uint32_t exception_handler_table[];
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static const char *exception_names[] = {
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"Reset", "Undefined instruction", "SWI", "Prefetch abort", "Data abort", "Reserved", "IRQ", "FIQ",
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};
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static const char *register_names[] = {
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"R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", "R8", "R9", "R10", "R11", "R12",
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"SP", "LR", "PC", "CPSR",
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};
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void setup_exception_handlers(void) {
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volatile uint32_t *bpmp_exception_handler_table = (volatile uint32_t *)0x6000F200;
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for (int i = 0; i < 8; i++) {
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if (exception_handler_table[i] != 0) {
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bpmp_exception_handler_table[i] = exception_handler_table[i];
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}
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}
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}
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void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
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uint8_t code_dump[CODE_DUMP_SIZE];
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uint8_t stack_dump[STACK_DUMP_SIZE];
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size_t code_dump_size;
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size_t stack_dump_size;
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uint32_t pc = registers[15];
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uint32_t cpsr = registers[16];
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uint32_t instr_addr = pc + ((cpsr & 0x20) ? 2 : 4) - CODE_DUMP_SIZE;
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printk("\nSomething went wrong...\n");
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code_dump_size = safecpy(code_dump, (const void *)instr_addr, CODE_DUMP_SIZE);
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stack_dump_size = safecpy(stack_dump, (const void *)registers[13], STACK_DUMP_SIZE);
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printk("\nException type: %s\n", exception_names[exception_type]);
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printk("\nRegisters:\n\n");
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/* Print r0 to pc. */
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for (int i = 0; i < 16; i += 2) {
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printk("%-7s%08"PRIX32" %-7s%08"PRIX32"\n", register_names[i], registers[i], register_names[i+1], registers[i+1]);
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}
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/* Print cpsr. */
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printk("%-7s%08"PRIX32"\n", register_names[16], registers[16]);
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printk("\nCode dump:\n");
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hexdump(code_dump, code_dump_size, instr_addr);
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printk("\nStack dump:\n");
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hexdump(stack_dump, stack_dump_size, registers[13]);
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printk("\n");
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fatal_error("An exception occured!\n");
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}
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12
fusee/fusee-secondary/src/exception_handlers.h
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12
fusee/fusee-secondary/src/exception_handlers.h
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@ -0,0 +1,12 @@
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#ifndef FUSEE_EXCEPTION_HANDLERS_H
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#define FUSEE_EXCEPTION_HANDLERS_H
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#include <stdint.h>
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#include <stddef.h>
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/* Copies up to len bytes, stops and returns the read length on data fault. */
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size_t safecpy(void *dst, const void *src, size_t len);
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void setup_exception_handlers(void);
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#endif
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109
fusee/fusee-secondary/src/exception_handlers_asm.s
Normal file
109
fusee/fusee-secondary/src/exception_handlers_asm.s
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@ -0,0 +1,109 @@
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.macro GEN_USUAL_HANDLER name, index, lr_arm_displ, lr_thumb_displ
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_exception_handler_\name:
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ldr sp, =_regs
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stmia sp!, {r0-r7}
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/* Adjust lr to make it point to the location where the exception occured. */
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mrs r1, spsr
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tst r1, #0x20
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subeq lr, lr, #\lr_arm_displ
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subne lr, lr, #\lr_thumb_displ
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mov r0, sp
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mov r1, #\index
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b _exception_handler_common
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.endm
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.section .text.exception_handlers_asm, "ax", %progbits
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.arm
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.align 4
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_exception_handler_common:
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mrs r2, spsr
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mrs r3, cpsr
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/* Mask interrupts. */
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orr r3, #0xC0
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msr cpsr_cx, r3
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/* Switch to the mode that triggered the interrupt, get the remaining regs, switch back. */
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ands r4, r2, #0xF
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moveq r4, #0xF /* usr => sys */
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bic r5, r3, #0xF
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orr r5, r4
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msr cpsr_c, r5
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stmia r0!, {r8-lr}
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msr cpsr_c, r3
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str lr, [r0], #4
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str r2, [r0]
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/* Finally, switch to system mode, setting interrupts and clearing the flags; set sp as well. */
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msr cpsr_cxsf, #0xDF
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ldr sp, =(_exception_handler_stack + 0x1000)
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ldr r0, =_regs
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bl exception_handler_main
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b .
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GEN_USUAL_HANDLER undefined_instruction, 1, 4, 2
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GEN_USUAL_HANDLER swi, 2, 4, 2
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GEN_USUAL_HANDLER prefetch_abort, 3, 4, 4
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GEN_USUAL_HANDLER data_abort_normal, 4, 8, 8
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GEN_USUAL_HANDLER fiq, 7, 4, 4
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_exception_handler_data_abort:
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/* Mask interrupts (abort mode). */
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msr cpsr_cx, #0xD7
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adr sp, safecpy+8
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cmp lr, sp
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blo _exception_handler_data_abort_normal
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adr sp, _safecpy_end+8
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cmp lr, sp
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bhs _exception_handler_data_abort_normal
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/* Set the flags, set r12 to 0 for safecpy, return from exception. */
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msr spsr_f, #(1 << 30)
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mov r12, #0
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subs pc, lr, #4
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.global safecpy
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.type safecpy, %function
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safecpy:
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push {r4, lr}
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mov r3, #0
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movs r12, #1
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_safecpy_loop:
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ldrb r4, [r1, r3]
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cmp r12, #0
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beq _safecpy_loop_end
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strb r4, [r0, r3]
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add r3, #1
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cmp r3, r2
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blo _safecpy_loop
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_safecpy_loop_end:
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mov r0, r3
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pop {r4, lr}
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bx lr /* Need to do that separately on ARMv4. */
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_safecpy_end:
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.section .rodata.exception_handlers_asm, "a", %progbits
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.align 2
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.global exception_handler_table
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exception_handler_table:
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.word 0 /* Reset */
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.word _exception_handler_undefined_instruction
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.word _exception_handler_swi
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.word _exception_handler_prefetch_abort
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.word _exception_handler_data_abort
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.word 0 /* Reserved */
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.word 0 /* IRQ */
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.word _exception_handler_fiq
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.section .bss.exception_handlers_asm, "w", %nobits
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.align 4
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_exception_handler_stack: .skip 0x1000
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_regs: .skip (4 * 17)
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@ -5,6 +5,7 @@
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#include <malloc.h>
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#include "utils.h"
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#include "panic.h"
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#include "exception_handlers.h"
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#include "loader.h"
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#include "chainloader.h"
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#include "stage2.h"
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@ -26,9 +27,11 @@ static void setup_env(void) {
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generic_panic();
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}
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/* Set up exception handlers. */
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setup_exception_handlers();
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if(switchfs_mount_all() == -1) {
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perror("Failed to mount at least one parition");
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generic_panic();
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fatal_error("Failed to mount at least one parition: %s\n", strerror(errno));
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}
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/* TODO: What other hardware init should we do here? */
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