mescc: Mes C Library: ARM: _start: Inline fake asm.
* lib/linux/arm-mes-gcc/crt1.c (_start): Use inline fake asm.
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Jan (janneke) Nieuwenhuizen
parent
733b927c4c
commit
99a9ab7411
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@ -22,11 +22,11 @@
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#include <mes/lib-mini.h>
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//int main (int argc, char *argv[], char *envp[]);
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#if !__TINYC__
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/* Note: GCC automatically emits a preable in order to set up the
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frame pointer: "push {fp}" "add fp, sp, 0"
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*/
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// *INDENT-OFF*
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#if !__TINYC__
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void
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_start ()
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{
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@ -76,46 +76,81 @@ _start ()
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);
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}
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#else //__TINYC__
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__asm__ (".global _start\n");
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__asm__ ("_start:\n");
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__asm__ (".int 0xe52db004\n"); //push {fp} ; (str fp, [sp, #-4]!)
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__asm__ (".int 0xe28db000\n"); //add fp, sp, #0
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__asm__ (".int 0xe3a00000\n"); //mov r0, #0
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__asm__ (".int 0xe1a02000\n"); //mov r2, r0
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__asm__ (".int 0xe3003000\n"); //movw r3, #0
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__asm__ (".int 0xe3403000\n"); //movt r3, #0
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__asm__ (".int 0xe5832000\n"); //str r2, [r3]
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__asm__ (".int 0xe3a00001\n"); //mov r0, #1
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__asm__ (".int 0xe1a02000\n"); //mov r2, r0
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__asm__ (".int 0xe3003000\n"); //movw r3, #0
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__asm__ (".int 0xe3403000\n"); //movt r3, #0
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__asm__ (".int 0xe5832000\n"); //str r2, [r3]
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__asm__ (".int 0xe3a00002\n"); //mov r0, #2
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__asm__ (".int 0xe1a02000\n"); //mov r2, r0
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__asm__ (".int 0xe3003000\n"); //movw r3, #0
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__asm__ (".int 0xe3403000\n"); //movt r3, #0
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__asm__ (".int 0xe5832000\n"); //str r2, [r3]
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__asm__ (".int 0xe59b0004\n"); //ldr r0, [fp, #4]
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__asm__ (".int 0xe28b1008\n"); //add r1, fp, #8
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__asm__ (".int 0xe2802001\n"); //add r2, r0, #1
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__asm__ (".int 0xe1a02102\n"); //lsl r2, r2, #2
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__asm__ (".int 0xe0822001\n"); //add r2, r2, r1
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__asm__ (".int 0xe52d2004\n"); //push {r2} ; (str r2, [sp, #-4]!)
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__asm__ (".int 0xe52d1004\n"); //push {r1} ; (str r1, [sp, #-4]!)
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__asm__ (".int 0xe52d0004\n"); //push {r0} ; (str r0, [sp, #-4]!)
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__asm__ (".int 0xe1a02002\n"); //mov r2, r2
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__asm__ (".int 0xe3003000\n"); //movw r3, #0
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__asm__ (".int 0xe3403000\n"); //movt r3, #0
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__asm__ (".int 0xe5832000\n"); //str r2, [r3]
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__asm__ (".int 0xe59d0000\n"); //ldr r0, [sp]
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__asm__ (".int 0xe59d1004\n"); //ldr r1, [sp, #4]
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__asm__ (".int 0xe59d2008\n"); //ldr r2, [sp, #8]
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__asm__ (".int 0xebfffffe\n"); //bl 0 <main>
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__asm__ (".int 0xe3a07001\n"); //mov r7, #1
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__asm__ (".int 0xef000000\n"); //svc 0x00000000
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__asm__ (".int 0xe320f003\n"); //wfi
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe28bd000\n"); //add sp, fp, #0
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__asm__ (".int 0xe49db004\n"); //pop {fp} ; (ldr fp, [sp], #4)
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__asm__ (".int 0xe12fff1e\n"); //bx lr
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void
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_start ()
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{
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#if 0
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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#endif
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int *in = &__stdin;
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int *out = &__stdout;
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int *err = &__stderr;
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char ***env = &environ;
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#if 0
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*in = 0x22;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*out = 0x33;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*err = 0x44;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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*env = 0x55;
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__asm__ (".int 0xe320f000\n"); //nop {0}
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#endif
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/* environ = argv + argc + 1 */
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__asm__ (".int 0xe59b000c\n"); //ldr r0, [fp, #12]
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__asm__ (".int 0xe28b1010\n"); //add r1, fp, #16
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__asm__ (".int 0xe2802001\n"); //add r2, r0, #1
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__asm__ (".int 0xe1a02102\n"); //lsl r2, r2, #2
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__asm__ (".int 0xe0822001\n"); //add r2, r2, r1
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// setup argc, argv, envp parameters on stack
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__asm__ (".int 0xe52d2004\n"); //push {r2} ; (str r2, [sp, #-4]!)
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__asm__ (".int 0xe52d1004\n"); //push {r1} ; (str r1, [sp, #-4]!)
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__asm__ (".int 0xe52d0004\n"); //push {r0} ; (str r0, [sp, #-4]!)
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__asm__ (".int 0xe1a02002\n"); //mov r2, r2
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// *in = 0;
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__asm__ (".int 0xe3a01000\n"); //mov r1, #0
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__asm__ (".int 0xe51b0004\n"); //ldr r0, [fp, #-4]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *out = 1;
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__asm__ (".int 0xe3a01001\n"); //mov r1, #1
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__asm__ (".int 0xe51b0008\n"); //ldr r0, [fp, #-8]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *err = 2;
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__asm__ (".int 0xe3a01002\n"); //mov r1, #2
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__asm__ (".int 0xe51b000c\n"); //ldr r0, [fp, #-12]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// *env = [sp, #8]
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__asm__ (".int 0xe59d1008\n"); //ldr r1, [sp, #8]
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__asm__ (".int 0xe51b0010\n"); //ldr r0, [fp, #-16]
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__asm__ (".int 0xe5801000\n"); //str r1, [r0]
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__asm__ (".int 0xe320f000\n"); //nop {0}
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// setup argc, argv, envp parameters in registers
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__asm__ (".int 0xe59d0000\n"); //ldr r0, [sp]
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__asm__ (".int 0xe59d1004\n"); //ldr r1, [sp, #4]
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__asm__ (".int 0xe59d2008\n"); //ldr r2, [sp, #8]
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main ();
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__asm__ (".int 0xe3a07001\n"); //mov r7, #1
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__asm__ (".int 0xef000000\n"); //svc 0x00000000
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__asm__ (".int 0xe320f003\n"); //wfi
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__asm__ (".int 0xe320f000\n"); //nop {0}
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}
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#endif //__TINYC__
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