From 6a3abb0f55cc77403c19934641d380be91cd1fdd Mon Sep 17 00:00:00 2001
From: xamidev <xamidev@riseup.net>
Date: Sat, 14 Mar 2026 10:13:53 +0100
Subject: [PATCH] Read RFLAGS register at panic

---
 src/debug/panic.c      | 59 ++++++++++++++++++++++++++++++++++++++----
 src/debug/stacktrace.c |  2 +-
 src/idt/idt.c          |  7 +++++
 3 files changed, 62 insertions(+), 6 deletions(-)

diff --git a/src/debug/panic.c b/src/debug/panic.c
index d15a27d..3c2c5f2 100644
--- a/src/debug/panic.c
+++ b/src/debug/panic.c
@@ -11,6 +11,53 @@
 
 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
  * @ctx: CPU context (optional)
@@ -30,29 +77,31 @@ void panic(struct cpu_status_t* ctx, const char* str)
 		fctprintf((void*)&skputc, 0, "\x1b[0m");
 		skputc('\r');
 		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) {
 			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();
 	}
-	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,
 		str,
 		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);
 	
 	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,
 		str,
 		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);
 	}
-	
+
+	read_rflags(ctx->iret_flags);
 	debug_stack_trace(100);
 	
 	hcf();
diff --git a/src/debug/stacktrace.c b/src/debug/stacktrace.c
index 430bf94..3845c8c 100644
--- a/src/debug/stacktrace.c
+++ b/src/debug/stacktrace.c
@@ -46,7 +46,7 @@ void debug_stack_trace(unsigned int max_frames)
         rbp = next_rbp;
     }
     if (init.terminal) {
-        printf("*** end stack trace ***\x1b[0m");
+        printf("*** end stack trace ***\r\nHalting system...\x1b[0m");
     }
     DEBUG("*** end stack trace ***");
 }
diff --git a/src/idt/idt.c b/src/idt/idt.c
index dd465e9..f70959f 100644
--- a/src/idt/idt.c
+++ b/src/idt/idt.c
@@ -154,6 +154,12 @@ static void gp_fault_handler(struct cpu_status_t* ctx)
     panic(ctx, "gp fault");
 }
 
+// DEBUG
+void kbdproc_main(void* arg)
+{
+    printf("Key pressed/released.\r\n");
+}
+
 /*
  * interrupt_dispatch - Interrupt dispatcher
  * @context: CPU context
@@ -252,6 +258,7 @@ struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
 
         case 33: // Keyboard Interrupt
             keyboard_handler();
+            process_create("keyboard-initiated", kbdproc_main, NULL); // DEBUG
             outb(0x20, 0x20);
             break;