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[release/7.0-staging] [Mono] Look for Native Signal SIMD Context #89568

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merged 3 commits into from
Jul 27, 2023
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[release/7.0-staging] [Mono] Look for Native Signal SIMD Context #89568

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d302aba
Find Navtive Signal SIMD Context
fanyang-mono Jul 25, 2023
40f6eeb
Fix coding format
fanyang-mono Jul 26, 2023
3ce73f9
Set fregs to 0 when SIMD registers were not found
fanyang-mono Jul 26, 2023
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29 changes: 25 additions & 4 deletions src/mono/mono/utils/mono-context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -534,11 +534,32 @@ mono_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
#endif
#ifdef __linux__
struct fpsimd_context *fpctx = (struct fpsimd_context*)&((ucontext_t*)sigctx)->uc_mcontext.__reserved;
int i;

g_assert (fpctx->head.magic == FPSIMD_MAGIC);
for (i = 0; i < 32; ++i)
mctx->fregs [i] = fpctx->vregs [i];
size_t size = 0;
do {
struct fpsimd_context *fpctx_temp = (struct fpsimd_context*)&(((ucontext_t*)sigctx)->uc_mcontext.__reserved[size]);

if (fpctx_temp->head.magic == FPSIMD_MAGIC)
{
g_assert (fpctx_temp->head.size >= sizeof (struct fpsimd_context));
g_assert (size + fpctx_temp->head.size <= sizeof (((ucontext_t*)sigctx)->uc_mcontext.__reserved));

fpctx = fpctx_temp;
break;
}

if (fpctx_temp->head.size == 0)
break;

size += fpctx_temp->head.size;
} while (size + sizeof (struct fpsimd_context) <= sizeof (((ucontext_t*)sigctx)->uc_mcontext.__reserved));

if (fpctx->head.magic == FPSIMD_MAGIC)
for (int i = 0; i < 32; ++i)
mctx->fregs [i] = fpctx->vregs [i];
else
for (int i = 0; i < 32; ++i)
mctx->fregs [i] = 0;
#endif
/* FIXME: apple */
#endif
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