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ARM: Add fake asm for crt1.c.

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* lib/linux/arm-mes-gcc/crt1.c (_start)[__TINYC__]: Use fake asm.
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Jan (janneke) Nieuwenhuizen 2020-11-22 21:29:54 +01:00
parent ed59c243a8
commit 420d422e34
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 49 additions and 5 deletions
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52
lib/linux/arm-mes-gcc/crt1.c
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@ -1,6 +1,6 @@
/* -*-comment-start: "//";comment-end:""-*- /* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software * GNU Mes --- Maxwell Equations of Software
* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> * Copyright © 2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2019,2020 Danny Milosavljevic <dannym@scratchpost.org> * Copyright © 2019,2020 Danny Milosavljevic <dannym@scratchpost.org>
* *
* This file is part of GNU Mes. * This file is part of GNU Mes.
@ -22,9 +22,9 @@
#include <mes/lib-mini.h> #include <mes/lib-mini.h>
//int main (int argc, char *argv[], char *envp[]); //int main (int argc, char *argv[], char *envp[]);
/* Note: GCC automatically emits a preable in order to set up the frame pointer: #if !__TINYC__
"push {fp}" /* Note: GCC automatically emits a preable in order to set up the
"add fp, sp, 0" frame pointer: "push {fp}" "add fp, sp, 0"
*/ */
// *INDENT-OFF* // *INDENT-OFF*
void void
@ -75,3 +75,47 @@ _start ()
"wfi \n\t" "wfi \n\t"
); );
} }
#else //__TINYC__
__asm__ (".global _start\n");
__asm__ ("_start:\n");
__asm__ (".int 0xe52db004\n"); //push {fp} ; (str fp, [sp, #-4]!)
__asm__ (".int 0xe28db000\n"); //add fp, sp, #0
__asm__ (".int 0xe3a00000\n"); //mov r0, #0
__asm__ (".int 0xe1a02000\n"); //mov r2, r0
__asm__ (".int 0xe3003000\n"); //movw r3, #0
__asm__ (".int 0xe3403000\n"); //movt r3, #0
__asm__ (".int 0xe5832000\n"); //str r2, [r3]
__asm__ (".int 0xe3a00001\n"); //mov r0, #1
__asm__ (".int 0xe1a02000\n"); //mov r2, r0
__asm__ (".int 0xe3003000\n"); //movw r3, #0
__asm__ (".int 0xe3403000\n"); //movt r3, #0
__asm__ (".int 0xe5832000\n"); //str r2, [r3]
__asm__ (".int 0xe3a00002\n"); //mov r0, #2
__asm__ (".int 0xe1a02000\n"); //mov r2, r0
__asm__ (".int 0xe3003000\n"); //movw r3, #0
__asm__ (".int 0xe3403000\n"); //movt r3, #0
__asm__ (".int 0xe5832000\n"); //str r2, [r3]
__asm__ (".int 0xe59b0004\n"); //ldr r0, [fp, #4]
__asm__ (".int 0xe28b1008\n"); //add r1, fp, #8
__asm__ (".int 0xe2802001\n"); //add r2, r0, #1
__asm__ (".int 0xe1a02102\n"); //lsl r2, r2, #2
__asm__ (".int 0xe0822001\n"); //add r2, r2, r1
__asm__ (".int 0xe52d2004\n"); //push {r2} ; (str r2, [sp, #-4]!)
__asm__ (".int 0xe52d1004\n"); //push {r1} ; (str r1, [sp, #-4]!)
__asm__ (".int 0xe52d0004\n"); //push {r0} ; (str r0, [sp, #-4]!)
__asm__ (".int 0xe1a02002\n"); //mov r2, r2
__asm__ (".int 0xe3003000\n"); //movw r3, #0
__asm__ (".int 0xe3403000\n"); //movt r3, #0
__asm__ (".int 0xe5832000\n"); //str r2, [r3]
__asm__ (".int 0xe59d0000\n"); //ldr r0, [sp]
__asm__ (".int 0xe59d1004\n"); //ldr r1, [sp, #4]
__asm__ (".int 0xe59d2008\n"); //ldr r2, [sp, #8]
__asm__ (".int 0xebfffffe\n"); //bl 0 <main>
__asm__ (".int 0xe3a07001\n"); //mov r7, #1
__asm__ (".int 0xef000000\n"); //svc 0x00000000
__asm__ (".int 0xe320f003\n"); //wfi
__asm__ (".int 0xe320f000\n"); //nop {0}
__asm__ (".int 0xe28bd000\n"); //add sp, fp, #0
__asm__ (".int 0xe49db004\n"); //pop {fp} ; (ldr fp, [sp], #4)
__asm__ (".int 0xe12fff1e\n"); //bx lr
#endif //__TINYC__