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authorDanny Holman <dholman@gymli.org>2024-06-24 02:07:27 -0500
committerDanny Holman <dholman@gymli.org>2024-06-24 02:07:27 -0500
commitb09100f8b79b77f613f5d68fd661e3cbaf1f5c86 (patch)
tree25c053e2b2a39e9ca356d57428bb5b045d7d42a9 /arch/i386/kernel
parent5e376ab1287be429c021907fa719ce42173b1df2 (diff)
arch: i386: add a function that walks the stack
Add a function that will walk the stack and save the return addresses into an array. This will allow the kernel to print out stack traces during a panic or on demand inside a debugger. Signed-off-by: Danny Holman <dholman@gymli.org>
Diffstat (limited to 'arch/i386/kernel')
-rw-r--r--arch/i386/kernel/stack_trace.s31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/i386/kernel/stack_trace.s b/arch/i386/kernel/stack_trace.s
new file mode 100644
index 0000000..fbd77ed
--- /dev/null
+++ b/arch/i386/kernel/stack_trace.s
@@ -0,0 +1,31 @@
+.section .text
+
+.global walk_stack
+.type walk_stack, @function
+walk_stack:
+ pushl %ebp
+ movl %esp, %ebp
+
+ pushl %edi
+ movl -4(%ebp), %edi
+ pushl %ebx
+ movl -8(%ebp), %ebx
+
+ xorl %eax, %eax
+ movl 8(%esp), %ebx
+ movl 16(%esp), %edi
+ movl 20(%esp), %ecx
+walk:
+ testl %ebx, %ebx
+ jz done
+ movl 4(%ebx), %edx
+ movl 0(%ebx), %ebx
+ movl %edx, (%edi)
+ addl $4, %edi
+ inc %eax
+ loop walk
+done:
+ popl %ebx
+ popl %edi
+ popl %ebp
+ ret