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compiler-rt: Support thumb versions older than armv6

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Add versions of __aeabi_memset and __aeabi_memclr which do not use mov
instructions between low registers, as this is unsupported on thumbv4t
and thumbv5.
This commit is contained in:
Carter Sande 2019-06-24 22:32:50 -07:00
parent de2b0cd722
commit cd02630da8
1 changed files with 41 additions and 2 deletions
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43
std/special/compiler_rt.zig
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@ -471,6 +471,28 @@ test "usesThumb1" {
//etc.
}
const use_thumb_1_pre_armv6 = usesThumb1PreArmv6(builtin.arch);
fn usesThumb1PreArmv6(arch: builtin.Arch) bool {
return switch (arch) {
.thumb => switch (arch.thumb) {
.v5,
.v5te,
.v4t,
=> true,
else => false,
},
.thumbeb => switch (arch.thumbeb) {
.v5,
.v5te,
.v4t,
=> true,
else => false,
},
else => false,
};
}
nakedcc fn __aeabi_memcpy() noreturn {
@setRuntimeSafety(false);
if (use_thumb_1) {
@ -505,7 +527,16 @@ nakedcc fn __aeabi_memmove() noreturn {
nakedcc fn __aeabi_memset() noreturn {
@setRuntimeSafety(false);
if (use_thumb_1) {
if (use_thumb_1_pre_armv6) {
asm volatile (
\\ eors r1, r2
\\ eors r2, r1
\\ eors r1, r2
\\ push {r7, lr}
\\ b memset
\\ pop {r7, pc}
);
} else if (use_thumb_1) {
asm volatile (
\\ mov r3, r1
\\ mov r1, r2
@ -527,7 +558,15 @@ nakedcc fn __aeabi_memset() noreturn {
nakedcc fn __aeabi_memclr() noreturn {
@setRuntimeSafety(false);
if (use_thumb_1) {
if (use_thumb_1_pre_armv6) {
asm volatile (
\\ adds r2, r1, #0
\\ movs r1, #0
\\ push {r7, lr}
\\ bl memset
\\ pop {r7, pc}
);
} else if (use_thumb_1) {
asm volatile (
\\ mov r2, r1
\\ movs r1, #0