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Diffstat (limited to 'js/src/ctypes/libffi/src/x86/ffi64.c')
| -rw-r--r-- | js/src/ctypes/libffi/src/x86/ffi64.c | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/js/src/ctypes/libffi/src/x86/ffi64.c b/js/src/ctypes/libffi/src/x86/ffi64.c new file mode 100644 index 0000000000..b7c7d5218e --- /dev/null +++ b/js/src/ctypes/libffi/src/x86/ffi64.c @@ -0,0 +1,896 @@ +/* ----------------------------------------------------------------------- + ffi64.c - Copyright (c) 2011, 2018 Anthony Green + Copyright (c) 2013 The Written Word, Inc. + Copyright (c) 2008, 2010 Red Hat, Inc. + Copyright (c) 2002, 2007 Bo Thorsen <bo@suse.de> + + x86-64 Foreign Function Interface + + Permission is hereby granted, free of charge, to any person obtaining + a copy of this software and associated documentation files (the + ``Software''), to deal in the Software without restriction, including + without limitation the rights to use, copy, modify, merge, publish, + distribute, sublicense, and/or sell copies of the Software, and to + permit persons to whom the Software is furnished to do so, subject to + the following conditions: + + The above copyright notice and this permission notice shall be included + in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, + EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + DEALINGS IN THE SOFTWARE. + ----------------------------------------------------------------------- */ + +#include <ffi.h> +#include <ffi_common.h> + +#include <stdlib.h> +#include <stdarg.h> +#include <stdint.h> +#include "internal64.h" + +#ifdef __x86_64__ + +#define MAX_GPR_REGS 6 +#define MAX_SSE_REGS 8 + +#if defined(__INTEL_COMPILER) +#include "xmmintrin.h" +#define UINT128 __m128 +#else +#if defined(__SUNPRO_C) +#include <sunmedia_types.h> +#define UINT128 __m128i +#else +#define UINT128 __int128_t +#endif +#endif + +union big_int_union +{ + UINT32 i32; + UINT64 i64; + UINT128 i128; +}; + +struct register_args +{ + /* Registers for argument passing. */ + UINT64 gpr[MAX_GPR_REGS]; + union big_int_union sse[MAX_SSE_REGS]; + UINT64 rax; /* ssecount */ + UINT64 r10; /* static chain */ +}; + +extern void ffi_call_unix64 (void *args, unsigned long bytes, unsigned flags, + void *raddr, void (*fnaddr)(void)) FFI_HIDDEN; + +/* All reference to register classes here is identical to the code in + gcc/config/i386/i386.c. Do *not* change one without the other. */ + +/* Register class used for passing given 64bit part of the argument. + These represent classes as documented by the PS ABI, with the + exception of SSESF, SSEDF classes, that are basically SSE class, + just gcc will use SF or DFmode move instead of DImode to avoid + reformatting penalties. + + Similary we play games with INTEGERSI_CLASS to use cheaper SImode moves + whenever possible (upper half does contain padding). */ +enum x86_64_reg_class + { + X86_64_NO_CLASS, + X86_64_INTEGER_CLASS, + X86_64_INTEGERSI_CLASS, + X86_64_SSE_CLASS, + X86_64_SSESF_CLASS, + X86_64_SSEDF_CLASS, + X86_64_SSEUP_CLASS, + X86_64_X87_CLASS, + X86_64_X87UP_CLASS, + X86_64_COMPLEX_X87_CLASS, + X86_64_MEMORY_CLASS + }; + +#define MAX_CLASSES 4 + +#define SSE_CLASS_P(X) ((X) >= X86_64_SSE_CLASS && X <= X86_64_SSEUP_CLASS) + +/* x86-64 register passing implementation. See x86-64 ABI for details. Goal + of this code is to classify each 8bytes of incoming argument by the register + class and assign registers accordingly. */ + +/* Return the union class of CLASS1 and CLASS2. + See the x86-64 PS ABI for details. */ + +static enum x86_64_reg_class +merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2) +{ + /* Rule #1: If both classes are equal, this is the resulting class. */ + if (class1 == class2) + return class1; + + /* Rule #2: If one of the classes is NO_CLASS, the resulting class is + the other class. */ + if (class1 == X86_64_NO_CLASS) + return class2; + if (class2 == X86_64_NO_CLASS) + return class1; + + /* Rule #3: If one of the classes is MEMORY, the result is MEMORY. */ + if (class1 == X86_64_MEMORY_CLASS || class2 == X86_64_MEMORY_CLASS) + return X86_64_MEMORY_CLASS; + + /* Rule #4: If one of the classes is INTEGER, the result is INTEGER. */ + if ((class1 == X86_64_INTEGERSI_CLASS && class2 == X86_64_SSESF_CLASS) + || (class2 == X86_64_INTEGERSI_CLASS && class1 == X86_64_SSESF_CLASS)) + return X86_64_INTEGERSI_CLASS; + if (class1 == X86_64_INTEGER_CLASS || class1 == X86_64_INTEGERSI_CLASS + || class2 == X86_64_INTEGER_CLASS || class2 == X86_64_INTEGERSI_CLASS) + return X86_64_INTEGER_CLASS; + + /* Rule #5: If one of the classes is X87, X87UP, or COMPLEX_X87 class, + MEMORY is used. */ + if (class1 == X86_64_X87_CLASS + || class1 == X86_64_X87UP_CLASS + || class1 == X86_64_COMPLEX_X87_CLASS + || class2 == X86_64_X87_CLASS + || class2 == X86_64_X87UP_CLASS + || class2 == X86_64_COMPLEX_X87_CLASS) + return X86_64_MEMORY_CLASS; + + /* Rule #6: Otherwise class SSE is used. */ + return X86_64_SSE_CLASS; +} + +/* Classify the argument of type TYPE and mode MODE. + CLASSES will be filled by the register class used to pass each word + of the operand. The number of words is returned. In case the parameter + should be passed in memory, 0 is returned. As a special case for zero + sized containers, classes[0] will be NO_CLASS and 1 is returned. + + See the x86-64 PS ABI for details. +*/ +static size_t +classify_argument (ffi_type *type, enum x86_64_reg_class classes[], + size_t byte_offset) +{ + switch (type->type) + { + case FFI_TYPE_UINT8: + case FFI_TYPE_SINT8: + case FFI_TYPE_UINT16: + case FFI_TYPE_SINT16: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + case FFI_TYPE_POINTER: + do_integer: + { + size_t size = byte_offset + type->size; + + if (size <= 4) + { + classes[0] = X86_64_INTEGERSI_CLASS; + return 1; + } + else if (size <= 8) + { + classes[0] = X86_64_INTEGER_CLASS; + return 1; + } + else if (size <= 12) + { + classes[0] = X86_64_INTEGER_CLASS; + classes[1] = X86_64_INTEGERSI_CLASS; + return 2; + } + else if (size <= 16) + { + classes[0] = classes[1] = X86_64_INTEGER_CLASS; + return 2; + } + else + FFI_ASSERT (0); + } + case FFI_TYPE_FLOAT: + if (!(byte_offset % 8)) + classes[0] = X86_64_SSESF_CLASS; + else + classes[0] = X86_64_SSE_CLASS; + return 1; + case FFI_TYPE_DOUBLE: + classes[0] = X86_64_SSEDF_CLASS; + return 1; +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + classes[0] = X86_64_X87_CLASS; + classes[1] = X86_64_X87UP_CLASS; + return 2; +#endif + case FFI_TYPE_STRUCT: + { + const size_t UNITS_PER_WORD = 8; + size_t words = (type->size + UNITS_PER_WORD - 1) / UNITS_PER_WORD; + ffi_type **ptr; + unsigned int i; + enum x86_64_reg_class subclasses[MAX_CLASSES]; + + /* If the struct is larger than 32 bytes, pass it on the stack. */ + if (type->size > 32) + return 0; + + for (i = 0; i < words; i++) + classes[i] = X86_64_NO_CLASS; + + /* Zero sized arrays or structures are NO_CLASS. We return 0 to + signalize memory class, so handle it as special case. */ + if (!words) + { + case FFI_TYPE_VOID: + classes[0] = X86_64_NO_CLASS; + return 1; + } + + /* Merge the fields of structure. */ + for (ptr = type->elements; *ptr != NULL; ptr++) + { + size_t num; + + byte_offset = FFI_ALIGN (byte_offset, (*ptr)->alignment); + + num = classify_argument (*ptr, subclasses, byte_offset % 8); + if (num == 0) + return 0; + for (i = 0; i < num; i++) + { + size_t pos = byte_offset / 8; + classes[i + pos] = + merge_classes (subclasses[i], classes[i + pos]); + } + + byte_offset += (*ptr)->size; + } + + if (words > 2) + { + /* When size > 16 bytes, if the first one isn't + X86_64_SSE_CLASS or any other ones aren't + X86_64_SSEUP_CLASS, everything should be passed in + memory. */ + if (classes[0] != X86_64_SSE_CLASS) + return 0; + + for (i = 1; i < words; i++) + if (classes[i] != X86_64_SSEUP_CLASS) + return 0; + } + + /* Final merger cleanup. */ + for (i = 0; i < words; i++) + { + /* If one class is MEMORY, everything should be passed in + memory. */ + if (classes[i] == X86_64_MEMORY_CLASS) + return 0; + + /* The X86_64_SSEUP_CLASS should be always preceded by + X86_64_SSE_CLASS or X86_64_SSEUP_CLASS. */ + if (i > 1 && classes[i] == X86_64_SSEUP_CLASS + && classes[i - 1] != X86_64_SSE_CLASS + && classes[i - 1] != X86_64_SSEUP_CLASS) + { + /* The first one should never be X86_64_SSEUP_CLASS. */ + FFI_ASSERT (i != 0); + classes[i] = X86_64_SSE_CLASS; + } + + /* If X86_64_X87UP_CLASS isn't preceded by X86_64_X87_CLASS, + everything should be passed in memory. */ + if (i > 1 && classes[i] == X86_64_X87UP_CLASS + && (classes[i - 1] != X86_64_X87_CLASS)) + { + /* The first one should never be X86_64_X87UP_CLASS. */ + FFI_ASSERT (i != 0); + return 0; + } + } + return words; + } + case FFI_TYPE_COMPLEX: + { + ffi_type *inner = type->elements[0]; + switch (inner->type) + { + case FFI_TYPE_INT: + case FFI_TYPE_UINT8: + case FFI_TYPE_SINT8: + case FFI_TYPE_UINT16: + case FFI_TYPE_SINT16: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + goto do_integer; + + case FFI_TYPE_FLOAT: + classes[0] = X86_64_SSE_CLASS; + if (byte_offset % 8) + { + classes[1] = X86_64_SSESF_CLASS; + return 2; + } + return 1; + case FFI_TYPE_DOUBLE: + classes[0] = classes[1] = X86_64_SSEDF_CLASS; + return 2; +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + classes[0] = X86_64_COMPLEX_X87_CLASS; + return 1; +#endif + } + } + } + abort(); +} + +/* Examine the argument and return set number of register required in each + class. Return zero iff parameter should be passed in memory, otherwise + the number of registers. */ + +static size_t +examine_argument (ffi_type *type, enum x86_64_reg_class classes[MAX_CLASSES], + _Bool in_return, int *pngpr, int *pnsse) +{ + size_t n; + unsigned int i; + int ngpr, nsse; + + n = classify_argument (type, classes, 0); + if (n == 0) + return 0; + + ngpr = nsse = 0; + for (i = 0; i < n; ++i) + switch (classes[i]) + { + case X86_64_INTEGER_CLASS: + case X86_64_INTEGERSI_CLASS: + ngpr++; + break; + case X86_64_SSE_CLASS: + case X86_64_SSESF_CLASS: + case X86_64_SSEDF_CLASS: + nsse++; + break; + case X86_64_NO_CLASS: + case X86_64_SSEUP_CLASS: + break; + case X86_64_X87_CLASS: + case X86_64_X87UP_CLASS: + case X86_64_COMPLEX_X87_CLASS: + return in_return != 0; + default: + abort (); + } + + *pngpr = ngpr; + *pnsse = nsse; + + return n; +} + +/* Perform machine dependent cif processing. */ + +#ifndef __ILP32__ +extern ffi_status +ffi_prep_cif_machdep_efi64(ffi_cif *cif); +#endif + +ffi_status FFI_HIDDEN +ffi_prep_cif_machdep (ffi_cif *cif) +{ + int gprcount, ssecount, i, avn, ngpr, nsse; + unsigned flags; + enum x86_64_reg_class classes[MAX_CLASSES]; + size_t bytes, n, rtype_size; + ffi_type *rtype; + +#ifndef __ILP32__ + if (cif->abi == FFI_EFI64 || cif->abi == FFI_GNUW64) + return ffi_prep_cif_machdep_efi64(cif); +#endif + if (cif->abi != FFI_UNIX64) + return FFI_BAD_ABI; + + gprcount = ssecount = 0; + + rtype = cif->rtype; + rtype_size = rtype->size; + switch (rtype->type) + { + case FFI_TYPE_VOID: + flags = UNIX64_RET_VOID; + break; + case FFI_TYPE_UINT8: + flags = UNIX64_RET_UINT8; + break; + case FFI_TYPE_SINT8: + flags = UNIX64_RET_SINT8; + break; + case FFI_TYPE_UINT16: + flags = UNIX64_RET_UINT16; + break; + case FFI_TYPE_SINT16: + flags = UNIX64_RET_SINT16; + break; + case FFI_TYPE_UINT32: + flags = UNIX64_RET_UINT32; + break; + case FFI_TYPE_INT: + case FFI_TYPE_SINT32: + flags = UNIX64_RET_SINT32; + break; + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + flags = UNIX64_RET_INT64; + break; + case FFI_TYPE_POINTER: + flags = (sizeof(void *) == 4 ? UNIX64_RET_UINT32 : UNIX64_RET_INT64); + break; + case FFI_TYPE_FLOAT: + flags = UNIX64_RET_XMM32; + break; + case FFI_TYPE_DOUBLE: + flags = UNIX64_RET_XMM64; + break; +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + flags = UNIX64_RET_X87; + break; +#endif + case FFI_TYPE_STRUCT: + n = examine_argument (cif->rtype, classes, 1, &ngpr, &nsse); + if (n == 0) + { + /* The return value is passed in memory. A pointer to that + memory is the first argument. Allocate a register for it. */ + gprcount++; + /* We don't have to do anything in asm for the return. */ + flags = UNIX64_RET_VOID | UNIX64_FLAG_RET_IN_MEM; + } + else + { + _Bool sse0 = SSE_CLASS_P (classes[0]); + + if (rtype_size == 4 && sse0) + flags = UNIX64_RET_XMM32; + else if (rtype_size == 8) + flags = sse0 ? UNIX64_RET_XMM64 : UNIX64_RET_INT64; + else + { + _Bool sse1 = n == 2 && SSE_CLASS_P (classes[1]); + if (sse0 && sse1) + flags = UNIX64_RET_ST_XMM0_XMM1; + else if (sse0) + flags = UNIX64_RET_ST_XMM0_RAX; + else if (sse1) + flags = UNIX64_RET_ST_RAX_XMM0; + else + flags = UNIX64_RET_ST_RAX_RDX; + flags |= rtype_size << UNIX64_SIZE_SHIFT; + } + } + break; + case FFI_TYPE_COMPLEX: + switch (rtype->elements[0]->type) + { + case FFI_TYPE_UINT8: + case FFI_TYPE_SINT8: + case FFI_TYPE_UINT16: + case FFI_TYPE_SINT16: + case FFI_TYPE_INT: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + flags = UNIX64_RET_ST_RAX_RDX | ((unsigned) rtype_size << UNIX64_SIZE_SHIFT); + break; + case FFI_TYPE_FLOAT: + flags = UNIX64_RET_XMM64; + break; + case FFI_TYPE_DOUBLE: + flags = UNIX64_RET_ST_XMM0_XMM1 | (16 << UNIX64_SIZE_SHIFT); + break; +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + flags = UNIX64_RET_X87_2; + break; +#endif + default: + return FFI_BAD_TYPEDEF; + } + break; + default: + return FFI_BAD_TYPEDEF; + } + + /* Go over all arguments and determine the way they should be passed. + If it's in a register and there is space for it, let that be so. If + not, add it's size to the stack byte count. */ + for (bytes = 0, i = 0, avn = cif->nargs; i < avn; i++) + { + if (examine_argument (cif->arg_types[i], classes, 0, &ngpr, &nsse) == 0 + || gprcount + ngpr > MAX_GPR_REGS + || ssecount + nsse > MAX_SSE_REGS) + { + long align = cif->arg_types[i]->alignment; + + if (align < 8) + align = 8; + + bytes = FFI_ALIGN (bytes, align); + bytes += cif->arg_types[i]->size; + } + else + { + gprcount += ngpr; + ssecount += nsse; + } + } + if (ssecount) + flags |= UNIX64_FLAG_XMM_ARGS; + + cif->flags = flags; + cif->bytes = (unsigned) FFI_ALIGN (bytes, 8); + + return FFI_OK; +} + +#ifndef __SANITIZE_ADDRESS__ +# ifdef __clang__ +# if __has_feature(address_sanitizer) +# define __SANITIZE_ADDRESS__ +# endif +# endif +#endif +#ifdef __SANITIZE_ADDRESS__ +__attribute__((noinline,no_sanitize_address)) +#endif +static void +ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue, + void **avalue, void *closure) +{ + enum x86_64_reg_class classes[MAX_CLASSES]; + char *stack, *argp; + ffi_type **arg_types; + int gprcount, ssecount, ngpr, nsse, i, avn, flags; + struct register_args *reg_args; + + /* Can't call 32-bit mode from 64-bit mode. */ + FFI_ASSERT (cif->abi == FFI_UNIX64); + + /* If the return value is a struct and we don't have a return value + address then we need to make one. Otherwise we can ignore it. */ + flags = cif->flags; + if (rvalue == NULL) + { + if (flags & UNIX64_FLAG_RET_IN_MEM) + rvalue = alloca (cif->rtype->size); + else + flags = UNIX64_RET_VOID; + } + + /* Allocate the space for the arguments, plus 4 words of temp space. */ + stack = alloca (sizeof (struct register_args) + cif->bytes + 4*8); + reg_args = (struct register_args *) stack; + argp = stack + sizeof (struct register_args); + + reg_args->r10 = (uintptr_t) closure; + + gprcount = ssecount = 0; + + /* If the return value is passed in memory, add the pointer as the + first integer argument. */ + if (flags & UNIX64_FLAG_RET_IN_MEM) + reg_args->gpr[gprcount++] = (unsigned long) rvalue; + + avn = cif->nargs; + arg_types = cif->arg_types; + + for (i = 0; i < avn; ++i) + { + size_t n, size = arg_types[i]->size; + + n = examine_argument (arg_types[i], classes, 0, &ngpr, &nsse); + if (n == 0 + || gprcount + ngpr > MAX_GPR_REGS + || ssecount + nsse > MAX_SSE_REGS) + { + long align = arg_types[i]->alignment; + + /* Stack arguments are *always* at least 8 byte aligned. */ + if (align < 8) + align = 8; + + /* Pass this argument in memory. */ + argp = (void *) FFI_ALIGN (argp, align); + memcpy (argp, avalue[i], size); + argp += size; + } + else + { + /* The argument is passed entirely in registers. */ + char *a = (char *) avalue[i]; + unsigned int j; + + for (j = 0; j < n; j++, a += 8, size -= 8) + { + switch (classes[j]) + { + case X86_64_NO_CLASS: + case X86_64_SSEUP_CLASS: + break; + case X86_64_INTEGER_CLASS: + case X86_64_INTEGERSI_CLASS: + /* Sign-extend integer arguments passed in general + purpose registers, to cope with the fact that + LLVM incorrectly assumes that this will be done + (the x86-64 PS ABI does not specify this). */ + switch (arg_types[i]->type) + { + case FFI_TYPE_SINT8: + reg_args->gpr[gprcount] = (SINT64) *((SINT8 *) a); + break; + case FFI_TYPE_SINT16: + reg_args->gpr[gprcount] = (SINT64) *((SINT16 *) a); + break; + case FFI_TYPE_SINT32: + reg_args->gpr[gprcount] = (SINT64) *((SINT32 *) a); + break; + default: + reg_args->gpr[gprcount] = 0; + memcpy (®_args->gpr[gprcount], a, size); + } + gprcount++; + break; + case X86_64_SSE_CLASS: + case X86_64_SSEDF_CLASS: + memcpy (®_args->sse[ssecount++].i64, a, sizeof(UINT64)); + break; + case X86_64_SSESF_CLASS: + memcpy (®_args->sse[ssecount++].i32, a, sizeof(UINT32)); + break; + default: + abort(); + } + } + } + } + reg_args->rax = ssecount; + + ffi_call_unix64 (stack, cif->bytes + sizeof (struct register_args), + flags, rvalue, fn); +} + +#ifndef __ILP32__ +extern void +ffi_call_efi64(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue); +#endif + +void +ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) +{ +#ifndef __ILP32__ + if (cif->abi == FFI_EFI64 || cif->abi == FFI_GNUW64) + { + ffi_call_efi64(cif, fn, rvalue, avalue); + return; + } +#endif + ffi_call_int (cif, fn, rvalue, avalue, NULL); +} + +#ifndef __ILP32__ +extern void +ffi_call_go_efi64(ffi_cif *cif, void (*fn)(void), void *rvalue, + void **avalue, void *closure); +#endif + +void +ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue, + void **avalue, void *closure) +{ +#ifndef __ILP32__ + if (cif->abi == FFI_EFI64 || cif->abi == FFI_GNUW64) + { + ffi_call_go_efi64(cif, fn, rvalue, avalue, closure); + return; + } +#endif + ffi_call_int (cif, fn, rvalue, avalue, closure); +} + + +extern void ffi_closure_unix64(void) FFI_HIDDEN; +extern void ffi_closure_unix64_sse(void) FFI_HIDDEN; + +#ifndef __ILP32__ +extern ffi_status +ffi_prep_closure_loc_efi64(ffi_closure* closure, + ffi_cif* cif, + void (*fun)(ffi_cif*, void*, void**, void*), + void *user_data, + void *codeloc); +#endif + +ffi_status +ffi_prep_closure_loc (ffi_closure* closure, + ffi_cif* cif, + void (*fun)(ffi_cif*, void*, void**, void*), + void *user_data, + void *codeloc) +{ + static const unsigned char trampoline[16] = { + /* leaq -0x7(%rip),%r10 # 0x0 */ + 0x4c, 0x8d, 0x15, 0xf9, 0xff, 0xff, 0xff, + /* jmpq *0x3(%rip) # 0x10 */ + 0xff, 0x25, 0x03, 0x00, 0x00, 0x00, + /* nopl (%rax) */ + 0x0f, 0x1f, 0x00 + }; + void (*dest)(void); + char *tramp = closure->tramp; + +#ifndef __ILP32__ + if (cif->abi == FFI_EFI64 || cif->abi == FFI_GNUW64) + return ffi_prep_closure_loc_efi64(closure, cif, fun, user_data, codeloc); +#endif + if (cif->abi != FFI_UNIX64) + return FFI_BAD_ABI; + + if (cif->flags & UNIX64_FLAG_XMM_ARGS) + dest = ffi_closure_unix64_sse; + else + dest = ffi_closure_unix64; + + memcpy (tramp, trampoline, sizeof(trampoline)); + *(UINT64 *)(tramp + 16) = (uintptr_t)dest; + + closure->cif = cif; + closure->fun = fun; + closure->user_data = user_data; + + return FFI_OK; +} + +int FFI_HIDDEN +ffi_closure_unix64_inner(ffi_cif *cif, + void (*fun)(ffi_cif*, void*, void**, void*), + void *user_data, + void *rvalue, + struct register_args *reg_args, + char *argp) +{ + void **avalue; + ffi_type **arg_types; + long i, avn; + int gprcount, ssecount, ngpr, nsse; + int flags; + + avn = cif->nargs; + flags = cif->flags; + avalue = alloca(avn * sizeof(void *)); + gprcount = ssecount = 0; + + if (flags & UNIX64_FLAG_RET_IN_MEM) + { + /* On return, %rax will contain the address that was passed + by the caller in %rdi. */ + void *r = (void *)(uintptr_t)reg_args->gpr[gprcount++]; + *(void **)rvalue = r; + rvalue = r; + flags = (sizeof(void *) == 4 ? UNIX64_RET_UINT32 : UNIX64_RET_INT64); + } + + arg_types = cif->arg_types; + for (i = 0; i < avn; ++i) + { + enum x86_64_reg_class classes[MAX_CLASSES]; + size_t n; + + n = examine_argument (arg_types[i], classes, 0, &ngpr, &nsse); + if (n == 0 + || gprcount + ngpr > MAX_GPR_REGS + || ssecount + nsse > MAX_SSE_REGS) + { + long align = arg_types[i]->alignment; + + /* Stack arguments are *always* at least 8 byte aligned. */ + if (align < 8) + align = 8; + + /* Pass this argument in memory. */ + argp = (void *) FFI_ALIGN (argp, align); + avalue[i] = argp; + argp += arg_types[i]->size; + } + /* If the argument is in a single register, or two consecutive + integer registers, then we can use that address directly. */ + else if (n == 1 + || (n == 2 && !(SSE_CLASS_P (classes[0]) + || SSE_CLASS_P (classes[1])))) + { + /* The argument is in a single register. */ + if (SSE_CLASS_P (classes[0])) + { + avalue[i] = ®_args->sse[ssecount]; + ssecount += n; + } + else + { + avalue[i] = ®_args->gpr[gprcount]; + gprcount += n; + } + } + /* Otherwise, allocate space to make them consecutive. */ + else + { + char *a = alloca (16); + unsigned int j; + + avalue[i] = a; + for (j = 0; j < n; j++, a += 8) + { + if (SSE_CLASS_P (classes[j])) + memcpy (a, ®_args->sse[ssecount++], 8); + else + memcpy (a, ®_args->gpr[gprcount++], 8); + } + } + } + + /* Invoke the closure. */ + fun (cif, rvalue, avalue, user_data); + + /* Tell assembly how to perform return type promotions. */ + return flags; +} + +extern void ffi_go_closure_unix64(void) FFI_HIDDEN; +extern void ffi_go_closure_unix64_sse(void) FFI_HIDDEN; + +#ifndef __ILP32__ +extern ffi_status +ffi_prep_go_closure_efi64(ffi_go_closure* closure, ffi_cif* cif, + void (*fun)(ffi_cif*, void*, void**, void*)); +#endif + +ffi_status +ffi_prep_go_closure (ffi_go_closure* closure, ffi_cif* cif, + void (*fun)(ffi_cif*, void*, void**, void*)) +{ +#ifndef __ILP32__ + if (cif->abi == FFI_EFI64 || cif->abi == FFI_GNUW64) + return ffi_prep_go_closure_efi64(closure, cif, fun); +#endif + if (cif->abi != FFI_UNIX64) + return FFI_BAD_ABI; + + closure->tramp = (cif->flags & UNIX64_FLAG_XMM_ARGS + ? ffi_go_closure_unix64_sse + : ffi_go_closure_unix64); + closure->cif = cif; + closure->fun = fun; + + return FFI_OK; +} + +#endif /* __x86_64__ */ |