artemist/mes
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

mescc: Mes C Library: ARM: _exit: Inline fake asm.

Browse source 
* lib/linux/arm-mes-gcc/_exit.c (_exit): Use inline fake asm.
This commit is contained in:
Jan (janneke) Nieuwenhuizen 2020-12-07 13:03:06 +01:00
parent 4e7a6057aa
commit 0667d1aa25
No known key found for this signature in database
GPG key ID: F3C1A0D9C1D65273
1 changed files with 10 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
lib/linux/arm-mes-gcc/_exit.c
View file

@ -21,10 +21,9 @@
#include "mes/lib-mini.h"
#define SYS_exit "0x01"
// *INDENT-OFF*
#if !__TINYC__
#define SYS_exit "0x01"
void
_exit (int code)
{
@ -40,19 +39,13 @@ _exit (int code)
_exit (0);
}
#else //__TINYC__
__asm__ (".global _exit\n");
__asm__ ("_exit:\n");
__asm__ (".int 0xe92d4880\n"); //push {r7, fp, lr}
__asm__ (".int 0xe28db008\n"); //add fp, sp, #8
__asm__ (".int 0xe24dd00c\n"); //sub sp, sp, #12
__asm__ (".int 0xe50b0010\n"); //str r0, [fp, #-16]
__asm__ (".int 0xe51b3010\n"); //ldr r3, [fp, #-16]
__asm__ (".int 0xe3a07001\n"); //mov r7, #1
__asm__ (".int 0xe1a00003\n"); //mov r0, r3
#define SYS_exit 0x01
void
_exit (int code)
{
int c = SYS_exit;
__asm__ (".int 0xe51b7004\n"); //ldr r7, [fp, #-4] ; "c"
__asm__ (".int 0xe59b000c\n"); //ldr r0, [fp, #12] ; code
__asm__ (".int 0xef000000\n"); //svc 0x00000000
__asm__ (".int 0xe3a00000\n"); //mov r0, #0
__asm__ (".int 0xebfffffe\n"); //bl 0 <_exit>
__asm__ (".int 0xe320f000\n"); //nop {0}
__asm__ (".int 0xe24bd008\n"); //sub sp, fp, #8
__asm__ (".int 0xe8bd8880\n"); //pop {r7, fp, pc}
}
#endif //__TINYC__