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aarch64: Reduce the size of register_context

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We don't need to store 32 general and vector registers.
Only 8 of each are used for parameter passing.
This commit is contained in:
Richard Henderson
2014-10-21 22:41:07 -04:00
committed by Richard Henderson
parent 77c4cddca6
commit 95a04af134
4 changed files with 91 additions and 76 deletions
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35
src/aarch64/ffi.c
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@@ -21,8 +21,10 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <ffi.h>
#include <ffi_common.h>
#include "internal.h"
/* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
all further uses in this file will refer to the 128-bit type. */
@@ -35,38 +37,35 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
# define FFI_TYPE_LONGDOUBLE 4
#endif
#define N_X_ARG_REG 8
#define N_V_ARG_REG 8
#define AARCH64_FFI_WITH_V (1 << AARCH64_FFI_WITH_V_BIT)
union _d
{
UINT64 d;
UINT32 s[2];
};
struct _v
{
union _d d[2] __attribute__((aligned(16)));
};
struct call_context
{
UINT64 x [AARCH64_N_XREG];
struct
{
union _d d[2];
} v [AARCH64_N_VREG];
struct _v v[N_V_ARG_REG];
UINT64 x[N_X_ARG_REG];
UINT64 x8;
};
#if defined (__clang__) && defined (__APPLE__)
extern void
sys_icache_invalidate (void *start, size_t len);
extern void sys_icache_invalidate (void *start, size_t len);
#endif
static inline void
ffi_clear_cache (void *start, void *end)
{
#if defined (__clang__) && defined (__APPLE__)
sys_icache_invalidate (start, (char *)end - (char *)start);
sys_icache_invalidate (start, (char *)end - (char *)start);
#elif defined (__GNUC__)
__builtin___clear_cache (start, end);
__builtin___clear_cache (start, end);
#else
#error "Missing builtin to flush instruction cache"
#endif
@@ -802,7 +801,7 @@ ffi_prep_cif_machdep (ffi_cif *cif)
if (is_v_register_candidate (cif->rtype))
{
cif->aarch64_flags |= AARCH64_FFI_WITH_V;
cif->aarch64_flags |= AARCH64_FLAG_ARG_V;
}
else
{
@@ -810,7 +809,7 @@ ffi_prep_cif_machdep (ffi_cif *cif)
for (i = 0; i < cif->nargs; i++)
if (is_v_register_candidate (cif->arg_types[i]))
{
cif->aarch64_flags |= AARCH64_FFI_WITH_V;
cif->aarch64_flags |= AARCH64_FLAG_ARG_V;
break;
}
}
@@ -924,7 +923,7 @@ ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
}
else
{
memcpy (get_x_addr (&context, 8), &rvalue, sizeof (UINT64));
context.x8 = (uintptr_t)rvalue;
ffi_call_SYSV (aarch64_prep_args, &context, &ecif,
stack_bytes, fn);
}
@@ -1201,7 +1200,7 @@ ffi_closure_SYSV_inner (ffi_closure *closure, struct call_context *context,
}
else
{
memcpy (&rvalue, get_x_addr (context, 8), sizeof (UINT64));
rvalue = (void *)(uintptr_t)context->x8;
(closure->fun) (cif, rvalue, avalue, closure->user_data);
}
}