Clear `DF` flag during trap handling to conform to x86-64 calling convention

2024-11-24 22:46:52 +08:00 · 2024-11-24 22:46:52 +08:00 · 9e5075dab7
parent 5f35189a51
commit 9e5075dab7
1 changed files with 1 additions and 0 deletions
--- a/ostd/src/arch/x86/trap/trap.S
+++ b/ostd/src/arch/x86/trap/trap.S
@ -57,6 +57,7 @@ trap_handler_table:
 .section .text
 .global trap_common
 trap_common:
+    cld                     # clear DF before calling/returning to any C function to conform to x86-64 calling convention
    push rax
    mov ax, [rsp + 4*8]     # load cs
    and ax, 0x3             # test