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ARM: Fix arm-mes-gcc _start. 

* lib/linux/arm-mes-gcc/crt1.c: Fix arm-mes-gcc _start.
This commit is contained in:
Danny Milosavljevic 2019-03-10 21:45:25 +01:00 committed by Jan Nieuwenhuizen
parent 37149aa84d
commit 5199db9d8e
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GPG Key ID: F3C1A0D9C1D65273
1 changed files with 22 additions and 33 deletions
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55
lib/linux/arm-mes-gcc/crt1.c
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@ -25,59 +25,48 @@
void
_start ()
{
#if 0
asm (
"mov $0,%%eax\n\t"
"mov %%eax,%0\n"
"mov r0,#0\n\t"
"mov %0,r0\n"
: "=r" (__stdin)
: //no inputs ""
);
asm (
"mov $1,%%eax\n\t"
"mov %%eax,%0\n"
"mov r0,$1\n\t"
"mov %0,r0\n"
: "=r" (__stdout)
: //no inputs ""
);
asm (
"mov $2,%%eax\n\t"
"mov %%eax,%0\n"
"mov r0,$2\n\t"
"mov %0,r0\n"
: "=r" (__stderr)
: //no inputs ""
);
/* environ = argv + argc + 1 */
asm (
"mov %%ebp,%%eax\n\t"
"add $4,%%eax\n\t"
"movzbl (%%eax),%%eax\n\t"
"add $3,%%eax\n\t"
"shl $2,%%eax\n\t"
"add %%ebp,%%eax\n\t"
"mov %%eax,%0\n\t"
"push %%eax\n\t"
"pop {r7}\n\t" /* gcc has a strange preable pushing r7. FIXME: Be nicer. */
"ldr r0,[sp]\n\t" /* r0 = argc */
"add r1,sp,#4\n\t" /* r1 = &argv[0] */
"add r2,r1,#1\n\t" /* r2 = r1 + 1 */
"lsl r2,#2\n\t" /* r2 = (r1 + 1) << 2 */
"push {r2}\n\t" /* envp */
"push {r1}\n\t" /* argv */
"push {r0}\n\t" /* argc */
"mov %0,r2\n\t"
: "=r" (environ)
: //no inputs ""
);
asm (
"mov %ebp,%eax\n\t"
"add $8,%eax\n\t"
"push %eax\n\t"
"mov %ebp,%eax\n\t"
"add $4,%eax\n\t"
"movzbl (%eax),%eax\n\t"
);
#endif
asm (
"mov r2, $0\n\t"
"push {r2}\n\t"
"mov r1, $0\n\t"
"push {r1}\n\t"
"mov r0, $1\n\t"
"push {r0}\n\t"
"ldr r0,[sp]\n\t" /* argc */
"ldr r1,[sp, #4]\n\t" /* argv */
"ldr r2,[sp, #8]\n\t" /* envp */
"bl main\n\t"
"mov r7, $1\n\t"
"swi $0\n\t"
"mov r7, #1\n\t"
"swi #0\n\t"
"wfi \n\t"
);
}