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ARM: Implement setjmp/longjmp. 

* lib/arm-mes-gcc/setjmp.c (setjmp): Implement.
(longjmp): Implement.
This commit is contained in:
Danny Milosavljevic 2019-03-14 18:46:06 +01:00 committed by Jan Nieuwenhuizen
parent 21bf8a0d92
commit fbe90fb293
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1 changed files with 24 additions and 17 deletions
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41
lib/arm-mes-gcc/setjmp.c
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@ -21,34 +21,41 @@
#include <setjmp.h>
#include <stdlib.h>
/* This assumes that both longjmp and setjmp either have frames, or both have no frames. */
void
longjmp (jmp_buf env, int val)
{
val = val == 0 ? 1 : val;
// *INDENT-OFF*
#if 1
#warning LONGJMP not implemented
#else
asm (
"mov 0x8(%ebp),%ebp\n\t" // env*
"mov 0x4(%ebp),%ebx\n\t" // env->__pc
"mov 0x8(%ebp),%esp\n\t" // env->__sp
"mov 0x0(%ebp),%ebp\n\t" // env->__bp
"jmp *%ebx\n\t" // jmp *PC
);
#endif
"mov r0, %0\n\t"
"mov r1, %1\n\t"
"cmp r1, #0\n\t"
"moveq r1, #1\n\t" /* returning 0 is not allowed, even when the user wanted to. */
"ldr r13, [r0], #4\n\t" /* stack pointer (sp) */
"ldr r14, [r0], #4\n\t" /* link register (lr) */
"ldmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
// TODO: If using VFP, vldmia r0!, {d8-d15}
"mov r0, r1\n\t"
:
: "r" (env), "r" (val));
// *INDENT-ON*
// not reached
exit (42);
}
int
setjmp (jmp_buf env)
{
long *p = (long *) &env;
env[0].__bp = p[-2];
env[0].__pc = p[-1];
env[0].__sp = (long) &env;
// *INDENT-OFF*
asm (
"mov r0, %0\n\t"
"str r13, [r0], #4\n\t" /* stack pointer (sp) */
"str r14, [r0], #4\n\t" /* link register (lr) */
"stmia r0!, {r4, r5, r6, r7, r8, r9, r10, r11}\n\t"
// TODO: If using VFP, vstmia r0!, {d8-d15}
:
: "r" (env)
: "r0");
// *INDENT-ON*
return 0;
}