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

mescc: Mes C Library: ARM: _write.c: Inline fake asm.

Browse source 
* lib/linux/arm-mes-gcc/_write.c (_write): Use inline fake asm.
This commit is contained in:
Jan (janneke) Nieuwenhuizen 2020-12-07 13:03:21 +01:00
parent 0667d1aa25
commit e5ce69ec3f
No known key found for this signature in database
GPG key ID: F3C1A0D9C1D65273
1 changed files with 16 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
lib/linux/arm-mes-gcc/_write.c
View file

@ -21,10 +21,9 @@
#include "mes/lib-mini.h"
#define SYS_write "0x04"
// *INDENT-OFF*
#if !__TINYC__
#define SYS_write "0x04"
ssize_t
_write (int filedes, void const *buffer, size_t size)
{
@ -42,28 +41,20 @@ _write (int filedes, void const *buffer, size_t size)
);
return r;
}
// *INDENT-ON*
#else //__TINYC__
__asm__ (".global _write\n");
__asm__ ("_write:\n");
__asm__ (".int 0xe92d4880\n"); //push {r7, fp, lr}
__asm__ (".int 0xe28db008\n"); //add fp, sp, #8
__asm__ (".int 0xe24dd01c\n"); //sub sp, sp, #28
__asm__ (".int 0xe50b0018\n"); //str r0, [fp, #-24] ; 0xffffffe8
__asm__ (".int 0xe50b101c\n"); //str r1, [fp, #-28] ; 0xffffffe4
__asm__ (".int 0xe50b2020\n"); //str r2, [fp, #-32] ; 0xffffffe0
__asm__ (".int 0xe51b3018\n"); //ldr r3, [fp, #-24] ; 0xffffffe8
__asm__ (".int 0xe51bc01c\n"); //ldr ip, [fp, #-28] ; 0xffffffe4
__asm__ (".int 0xe51be020\n"); //ldr lr, [fp, #-32] ; 0xffffffe0
__asm__ (".int 0xe3a07004\n"); //mov r7, #4
__asm__ (".int 0xe1a00003\n"); //mov r0, r3
__asm__ (".int 0xe1a0100c\n"); //mov r1, ip
__asm__ (".int 0xe1a0300e\n"); //mov r3, lr
__asm__ (".int 0xef000000\n"); //svc 0x00000000
__asm__ (".int 0xe1a03000\n"); //mov r3, r0
__asm__ (".int 0xe50b3010\n"); //str r3, [fp, #-16]
__asm__ (".int 0xe51b3010\n"); //ldr r3, [fp, #-16]
__asm__ (".int 0xe1a00003\n"); //mov r0, r3
__asm__ (".int 0xe24bd008\n"); //sub sp, fp, #8
__asm__ (".int 0xe8bd8880\n"); //pop {r7, fp, pc}
#define SYS_write 0x04
ssize_t
_write (int filedes, void const *buffer, size_t size)
{
long r;
int c = SYS_write;
__asm__ (".int 0xe51b7008\n"); //ldr r7, [fp, #-8] ; <c>
__asm__ (".int 0xe59b000c\n"); //ldr r0, [fp, #12] ; filedes
__asm__ (".int 0xe59b1010\n"); //ldr r1, [fp, #16] ; buffer
__asm__ (".int 0xe59b2014\n"); //ldr r2, [fp, #20] ; size
__asm__ (".int 0xef000000\n"); //svc 0x00000000
__asm__ (".int 0xe50b0004\n"); //str r0, [fp, #-4]
return r;
}
#endif //__TINYC__
// *INDENT-ON*