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ARM: Add fake asm for mini.c.

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* lib/linux/arm-mes-gcc/mini.c (_exit, _write)[__TINYC__]: Add fake asm.
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Jan (janneke) Nieuwenhuizen 2020-11-22 21:35:38 +01:00
parent 420d422e34
commit 40f270f3d7
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 44 additions and 1 deletions
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45
lib/linux/arm-mes-gcc/mini.c
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@ -1,6 +1,6 @@
/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2016,2017,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2019,2020 Danny Milosavljevic <dannym@scratchpost.org>
*
* This file is part of GNU Mes.
@ -24,6 +24,7 @@
#define SYS_exit "0x01"
#define SYS_write "0x04"
#if !__TINYC__
// *INDENT-OFF*
void
_exit (int code)
@ -39,7 +40,25 @@ _exit (int code)
// not reached
_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
__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__
#if !__TINYC__
ssize_t
_write (int filedes, void const *buffer, size_t size)
{
@ -58,3 +77,27 @@ _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}
#endif //__TINYC__