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Message-ID: <exdwzuxv7qr24uogqhakmt7tog6cetcojzrxvx73jot4c7t26k@s2bz4cbkcbia>
Date: Wed, 12 Mar 2025 16:41:09 +0100
From: Ignacy Gawędzki <ignacy.gawedzki@...en-communications.fr>
To: musl@...ts.openwall.com
Subject: [RFC PATCH 1/1] arm: Add CFA annotations to __syscall_cp_asm.
When debugging a process that is currently in __syscall_cp_asm, GDB
loses track of the current frame once it passes __cp_begin. At that
moment, the frame is at $sp + 16, and it seems GDB is unable to infer
that without proper support.
A remedy is to add CFI annotations to that part of code, to tell that
the frame starts at $ip, right after $sp has been saved to $ip.
Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@...en-communications.fr>
---
src/thread/arm/syscall_cp.s | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/thread/arm/syscall_cp.s b/src/thread/arm/syscall_cp.s
index e607dd42..f5b9521e 100644
--- a/src/thread/arm/syscall_cp.s
+++ b/src/thread/arm/syscall_cp.s
@@ -10,7 +10,9 @@
.hidden __syscall_cp_asm
.type __syscall_cp_asm,%function
__syscall_cp_asm:
+ .cfi_startproc
mov ip,sp
+ .cfi_def_cfa_register ip
stmfd sp!,{r4,r5,r6,r7}
__cp_begin:
ldr r0,[r0]
@@ -27,3 +29,4 @@ __cp_end:
__cp_cancel:
ldmfd sp!,{r4,r5,r6,r7}
b __cancel
+ .cfi_endproc
--
2.45.2
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