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Read RFLAGS register at panic

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xamidev
2026-03-14 10:13:53 +01:00
parent 6ceccb2374
commit 6a3abb0f55
3 changed files with 62 additions and 6 deletions
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59
src/debug/panic.c
View File

@@ -11,6 +11,53 @@
extern struct init_status init; extern struct init_status init;
/*
* reaf_rflags - provide easy reading of the RFLAGS register
* @rflags: RFLAGS register value
*/
void read_rflags(uint64_t rflags)
{
DEBUG("\x1b[38;5;226m%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\x1b[38;5;231m",
CHECK_BIT(rflags, 0) ? "CF " : "", /*carry flag*/
CHECK_BIT(rflags, 2) ? "PF " : "", /*parity flag*/
CHECK_BIT(rflags, 4) ? "AF " : "", /*auxiliary carry flag*/
CHECK_BIT(rflags, 6) ? "ZF " : "", /*zero flag*/
CHECK_BIT(rflags, 7) ? "SF " : "", /*sign flag*/
CHECK_BIT(rflags, 8) ? "TF " : "", /*trap flag*/
CHECK_BIT(rflags, 9) ? "IF " : "", /*interrupt enable flag*/
CHECK_BIT(rflags, 10) ? "DF " : "", /*direction flag*/
CHECK_BIT(rflags, 11) ? "OF " : "", /*overflow flag*/
(CHECK_BIT(rflags, 12) && CHECK_BIT(rflags, 13)) ? "IOPL3 " : "IOPL0 ", /*io privilege lvl*/
CHECK_BIT(rflags, 14) ? "NT " : "", /*nested task*/
CHECK_BIT(rflags, 16) ? "RF " : "", /*resume flag*/
CHECK_BIT(rflags, 17) ? "VM " : "", /*virtual 8086 mode*/
CHECK_BIT(rflags, 18) ? "AC " : "", /*alignment check/access control*/
CHECK_BIT(rflags, 19) ? "VIF " : "", /*virtual interrupt flag*/
CHECK_BIT(rflags, 20) ? "VIP " : "", /*virtual interrupt pending*/
CHECK_BIT(rflags, 21) ? "ID " : ""); /*id flag*/
if (init.terminal) {
printf("\x1b[38;5;226m%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\x1b[38;5;231m\r\n",
CHECK_BIT(rflags, 0) ? "CF " : "",
CHECK_BIT(rflags, 2) ? "PF " : "",
CHECK_BIT(rflags, 4) ? "AF " : "",
CHECK_BIT(rflags, 6) ? "ZF " : "",
CHECK_BIT(rflags, 7) ? "SF " : "",
CHECK_BIT(rflags, 8) ? "TF " : "",
CHECK_BIT(rflags, 9) ? "IF " : "",
CHECK_BIT(rflags, 10) ? "DF " : "",
CHECK_BIT(rflags, 11) ? "OF " : "",
(CHECK_BIT(rflags, 12) && CHECK_BIT(rflags, 13)) ? "IOPL3 " : "IOPL0 ",
CHECK_BIT(rflags, 14) ? "NT " : "",
CHECK_BIT(rflags, 16) ? "RF " : "",
CHECK_BIT(rflags, 17) ? "VM " : "",
CHECK_BIT(rflags, 18) ? "AC " : "",
CHECK_BIT(rflags, 19) ? "VIF " : "",
CHECK_BIT(rflags, 20) ? "VIP " : "",
CHECK_BIT(rflags, 21) ? "ID " : "");
}
}
/* /*
* panic - Kernel panic * panic - Kernel panic
* @ctx: CPU context (optional) * @ctx: CPU context (optional)
@@ -30,29 +77,31 @@ void panic(struct cpu_status_t* ctx, const char* str)
fctprintf((void*)&skputc, 0, "\x1b[0m"); fctprintf((void*)&skputc, 0, "\x1b[0m");
skputc('\r'); skputc('\r');
skputc('\n'); skputc('\n');
DEBUG("\x1b[38;5;231m\x1b[48;5;196mend Kernel panic - halting...\x1b[0m"); DEBUG("\x1b[38;5;231m\x1b[48;5;196mend Kernel panic\x1b[0m");
if (init.terminal) { if (init.terminal) {
printf("\r\n\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[48;5;232m Something went horribly wrong! (no cpu ctx)"); printf("\r\n\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[48;5;232m Something went horribly wrong! (no cpu ctx)");
printf("\r\n%s\r\n\x1b[38;5;231mend Kernel panic - halting...\x1b[0m", str); printf("\r\n%s\r\n\x1b[38;5;231mend Kernel panic\x1b[0m", str);
} }
debug_stack_trace(100);
hcf(); hcf();
} }
DEBUG("\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[0m at rip=%p\r\nSomething went horribly wrong! (%s) vect=0x%.2x errcode=0x%x\n\rrax=%p rbx=%p rcx=%p rdx=%p\n\rrsi=%p rdi=%p r8=%p r9=%p\n\rr10=%p r11=%p r12=%p r13=%p\n\rr14=%p r15=%p\n\n\rflags=%p\n\rHalting...\x1b[0m", DEBUG("\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[0m at rip=%p\r\nSomething went horribly wrong! (%s) vect=0x%.2x errcode=0x%x\n\rrax=%p rbx=%p rcx=%p rdx=%p\n\rrsi=%p rdi=%p r8=%p r9=%p\n\rr10=%p r11=%p r12=%p r13=%p\n\rr14=%p r15=%p\n\n\rflags=%p\n\r\x1b[0m",
ctx->iret_rip, ctx->iret_rip,
str, str,
ctx->vector_number, ctx->error_code, ctx->rax, ctx->rbx, ctx->rcx, ctx->rdx, ctx->rsi, ctx->rdi, ctx->vector_number, ctx->error_code, ctx->rax, ctx->rbx, ctx->rcx, ctx->rdx, ctx->rsi, ctx->rdi,
ctx->r8, ctx->r9, ctx->r10, ctx->r11, ctx->r12, ctx->r13, ctx->r14, ctx->r15, ctx->iret_flags); ctx->r8, ctx->r9, ctx->r10, ctx->r11, ctx->r12, ctx->r13, ctx->r14, ctx->r15, ctx->iret_flags);
if (init.terminal) { if (init.terminal) {
printf("\r\n\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[48;5;232mat rip=%p\r\nSomething went horribly wrong! (%s) vect=0x%.2x errcode=0x%x\n\rrax=%p rbx=%p rcx=%p rdx=%p\n\rrsi=%p rdi=%p r8=%p r9=%p\n\rr10=%p r11=%p r12=%p r13=%p\n\rr14=%p r15=%p\n\n\rflags=%p\n\rHalting...\x1b[0m", printf("\r\n\x1b[38;5;231m\x1b[48;5;196mKernel panic!!!\x1b[48;5;232mat rip=%p\r\nSomething went horribly wrong! (%s) vect=0x%.2x errcode=0x%x\n\rrax=%p rbx=%p rcx=%p rdx=%p\n\rrsi=%p rdi=%p r8=%p r9=%p\n\rr10=%p r11=%p r12=%p r13=%p\n\rr14=%p r15=%p\n\n\rflags=%p ",
ctx->iret_rip, ctx->iret_rip,
str, str,
ctx->vector_number, ctx->error_code, ctx->rax, ctx->rbx, ctx->rcx, ctx->rdx, ctx->rsi, ctx->rdi, ctx->vector_number, ctx->error_code, ctx->rax, ctx->rbx, ctx->rcx, ctx->rdx, ctx->rsi, ctx->rdi,
ctx->r8, ctx->r9, ctx->r10, ctx->r11, ctx->r12, ctx->r13, ctx->r14, ctx->r15, ctx->iret_flags); ctx->r8, ctx->r9, ctx->r10, ctx->r11, ctx->r12, ctx->r13, ctx->r14, ctx->r15, ctx->iret_flags);
} }
read_rflags(ctx->iret_flags);
debug_stack_trace(100); debug_stack_trace(100);
hcf(); hcf();

2
src/debug/stacktrace.c
View File

@@ -46,7 +46,7 @@ void debug_stack_trace(unsigned int max_frames)
rbp = next_rbp; rbp = next_rbp;
} }
if (init.terminal) { if (init.terminal) {
printf("*** end stack trace ***\x1b[0m"); printf("*** end stack trace ***\r\nHalting system...\x1b[0m");
} }
DEBUG("*** end stack trace ***"); DEBUG("*** end stack trace ***");
} }

7
src/idt/idt.c
View File

@@ -154,6 +154,12 @@ static void gp_fault_handler(struct cpu_status_t* ctx)
panic(ctx, "gp fault"); panic(ctx, "gp fault");
} }
// DEBUG
void kbdproc_main(void* arg)
{
printf("Key pressed/released.\r\n");
}
/* /*
* interrupt_dispatch - Interrupt dispatcher * interrupt_dispatch - Interrupt dispatcher
* @context: CPU context * @context: CPU context
@@ -252,6 +258,7 @@ struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
case 33: // Keyboard Interrupt case 33: // Keyboard Interrupt
keyboard_handler(); keyboard_handler();
process_create("keyboard-initiated", kbdproc_main, NULL); // DEBUG
outb(0x20, 0x20); outb(0x20, 0x20);
break; break;