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py/asmarm: Use builtin func to flush I- and D-cache on ARM 7 archs.

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The inline assembler code does not work for __ARM_ARCH == 7.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2021-05-25 22:15:58 +10:00
parent c732b80f05
commit 4ee8ec6931
1 changed files with 3 additions and 3 deletions
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6
py/asmarm.c
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@ -40,7 +40,7 @@
void asm_arm_end_pass(asm_arm_t *as) {
if (as->base.pass == MP_ASM_PASS_EMIT) {
#if defined(__linux__) && defined(__GNUC__)
#if (defined(__linux__) && defined(__GNUC__)) || __ARM_ARCH == 7
char *start = mp_asm_base_get_code(&as->base);
char *end = start + mp_asm_base_get_code_size(&as->base);
__builtin___clear_cache(start, end);
@ -48,10 +48,10 @@ void asm_arm_end_pass(asm_arm_t *as) {
// flush I- and D-cache
asm volatile (
"0:"
"mrc p15, 0, r15, c7, c10, 3\n"
"mrc p15, 0, r15, c7, c10, 3\n" // test and clean D-cache
"bne 0b\n"
"mov r0, #0\n"
"mcr p15, 0, r0, c7, c7, 0\n"
"mcr p15, 0, r0, c7, c7, 0\n" // invalidate I-cache and D-cache
: : : "r0", "cc");
#endif
}