/* -----------------------------------------------------------------------
unix64.S - Copyright (c) 2013 The Written Word, Inc.
- Copyright (c) 2008 Red Hat, Inc
- Copyright (c) 2002 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.
----------------------------------------------------------------------- */
#ifdef __x86_64__
#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
.text
/* ffi_call_unix64 (void *args, unsigned long bytes, unsigned flags,
void *raddr, void (*fnaddr)(void));
Bit o trickiness here -- ARGS+BYTES is the base of the stack frame
for this function. This has been allocated by ffi_call. We also
deallocate some of the stack that has been alloca'd. */
.align 2
.globl ffi_call_unix64
.type ffi_call_unix64,@function
ffi_call_unix64:
.LUW0:
movq (%rsp), %r10 /* Load return address. */
leaq (%rdi, %rsi), %rax /* Find local stack base. */
movq %rdx, (%rax) /* Save flags. */
movq %rcx, 8(%rax) /* Save raddr. */
movq %rbp, 16(%rax) /* Save old frame pointer. */
movq %r10, 24(%rax) /* Relocate return address. */
movq %rax, %rbp /* Finalize local stack frame. */
.LUW1:
movq %rdi, %r10 /* Save a copy of the register area. */
movq %r8, %r11 /* Save a copy of the target fn. */
movl %r9d, %eax /* Set number of SSE registers. */
/* Load up all argument registers. */
movq (%r10), %rdi
movq 8(%r10), %rsi
movq 16(%r10), %rdx
movq 24(%r10), %rcx
movq 32(%r10), %r8
movq 40(%r10), %r9
testl %eax, %eax
jnz .Lload_sse
.Lret_from_load_sse:
/* Deallocate the reg arg area. */
leaq 176(%r10), %rsp
/* Call the user function. */
call *%r11
/* Deallocate stack arg area; local stack frame in redzone. */
leaq 24(%rbp), %rsp
movq 0(%rbp), %rcx /* Reload flags. */
movq 8(%rbp), %rdi /* Reload raddr. */
movq 16(%rbp), %rbp /* Reload old frame pointer. */
.LUW2:
/* The first byte of the flags contains the FFI_TYPE. */
movzbl %cl, %r10d
leaq .Lstore_table(%rip), %r11
movslq (%r11, %r10, 4), %r10
addq %r11, %r10
jmp *%r10
.Lstore_table:
.long .Lst_void-.Lstore_table /* FFI_TYPE_VOID */
.long .Lst_sint32-.Lstore_table /* FFI_TYPE_INT */
.long .Lst_float-.Lstore_table /* FFI_TYPE_FLOAT */
.long .Lst_double-.Lstore_table /* FFI_TYPE_DOUBLE */
.long .Lst_ldouble-.Lstore_table /* FFI_TYPE_LONGDOUBLE */
.long .Lst_uint8-.Lstore_table /* FFI_TYPE_UINT8 */
.long .Lst_sint8-.Lstore_table /* FFI_TYPE_SINT8 */
.long .Lst_uint16-.Lstore_table /* FFI_TYPE_UINT16 */
.long .Lst_sint16-.Lstore_table /* FFI_TYPE_SINT16 */
.long .Lst_uint32-.Lstore_table /* FFI_TYPE_UINT32 */
.long .Lst_sint32-.Lstore_table /* FFI_TYPE_SINT32 */
.long .Lst_int64-.Lstore_table /* FFI_TYPE_UINT64 */
.long .Lst_int64-.Lstore_table /* FFI_TYPE_SINT64 */
.long .Lst_struct-.Lstore_table /* FFI_TYPE_STRUCT */
.long .Lst_int64-.Lstore_table /* FFI_TYPE_POINTER */
.align 2
.Lst_void:
ret
.align 2
.Lst_uint8:
movzbq %al, %rax
movq %rax, (%rdi)
ret
.align 2
.Lst_sint8:
movsbq %al, %rax
movq %rax, (%rdi)
ret
.align 2
.Lst_uint16:
movzwq %ax, %rax
movq %rax, (%rdi)
.align 2
.Lst_sint16:
movswq %ax, %rax
movq %rax, (%rdi)
ret
.align 2
.Lst_uint32:
movl %eax, %eax
movq %rax, (%rdi)
.align 2
.Lst_sint32:
cltq
movq %rax, (%rdi)
ret
.align 2
.Lst_int64:
movq %rax, (%rdi)
ret
.align 2
.Lst_float:
movss %xmm0, (%rdi)
ret
.align 2
.Lst_double:
movsd %xmm0, (%rdi)
ret
.Lst_ldouble:
fstpt (%rdi)
ret
.align 2
.Lst_struct:
leaq -20(%rsp), %rsi /* Scratch area in redzone. */
/* We have to locate the values now, and since we don't want to
write too much data into the user's return value, we spill the
value to a 16 byte scratch area first. Bits 8, 9, and 10
control where the values are located. Only one of the three
bits will be set; see ffi_prep_cif_machdep for the pattern. */
movd %xmm0, %r10
movd %xmm1, %r11
testl $0x100, %ecx
cmovnz %rax, %rdx
cmovnz %r10, %rax
testl $0x200, %ecx
cmovnz %r10, %rdx
testl $0x400, %ecx
cmovnz %r10, %rax
cmovnz %r11, %rdx
movq %rax, (%rsi)
movq %rdx, 8(%rsi)
/* Bits 12-31 contain the true size of the structure. Copy from
the scratch area to the true destination. */
shrl $12, %ecx
rep movsb
ret
/* Many times we can avoid loading any SSE registers at all.
It's not worth an indirect jump to load the exact set of
SSE registers needed; zero or all is a good compromise. */
.align 2
.LUW3:
.Lload_sse:
movdqa 48(%r10), %xmm0
movdqa 64(%r10), %xmm1
movdqa 80(%r10), %xmm2
movdqa 96(%r10), %xmm3
movdqa 112(%r10), %xmm4
movdqa 128(%r10), %xmm5
movdqa 144(%r10), %xmm6
movdqa 160(%r10), %xmm7
jmp .Lret_from_load_sse
.LUW4:
.size ffi_call_unix64,.-ffi_call_unix64
.align 2
.globl ffi_closure_unix64
.type ffi_closure_unix64,@function
ffi_closure_unix64:
.LUW5:
/* The carry flag is set by the trampoline iff SSE registers
are used. Don't clobber it before the branch instruction. */
leaq -200(%rsp), %rsp
.LUW6:
movq %rdi, (%rsp)
movq %rsi, 8(%rsp)
movq %rdx, 16(%rsp)
movq %rcx, 24(%rsp)
movq %r8, 32(%rsp)
movq %r9, 40(%rsp)
jc .Lsave_sse
.Lret_from_save_sse:
movq %r10, %rdi
leaq 176(%rsp), %rsi
movq %rsp, %rdx
leaq 208(%rsp), %rcx
call ffi_closure_unix64_inner@PLT
/* Deallocate stack frame early; return value is now in redzone. */
addq $200, %rsp
.LUW7:
/* The first byte of the return value contains the FFI_TYPE. */
movzbl %al, %r10d
leaq .Lload_table(%rip), %r11
movslq (%r11, %r10, 4), %r10
addq %r11, %r10
jmp *%r10
.Lload_table:
.long .Lld_void-.Lload_table /* FFI_TYPE_VOID */
.long .Lld_int32-.Lload_table /* FFI_TYPE_INT */
.long .Lld_float-.Lload_table /* FFI_TYPE_FLOAT */
.long .Lld_double-.Lload_table /* FFI_TYPE_DOUBLE */
.long .Lld_ldouble-.Lload_table /* FFI_TYPE_LONGDOUBLE */
.long .Lld_int8-.Lload_table /* FFI_TYPE_UINT8 */
.long .Lld_int8-.Lload_table /* FFI_TYPE_SINT8 */
.long .Lld_int16-.Lload_table /* FFI_TYPE_UINT16 */
.long .Lld_int16-.Lload_table /* FFI_TYPE_SINT16 */
.long .Lld_int32-.Lload_table /* FFI_TYPE_UINT32 */
.long .Lld_int32-.Lload_table /* FFI_TYPE_SINT32 */
.long .Lld_int64-.Lload_table /* FFI_TYPE_UINT64 */
.long .Lld_int64-.Lload_table /* FFI_TYPE_SINT64 */
.long .Lld_struct-.Lload_table /* FFI_TYPE_STRUCT */
.long .Lld_int64-.Lload_table /* FFI_TYPE_POINTER */
.align 2
.Lld_void:
ret
.align 2
.Lld_int8:
movzbl -24(%rsp), %eax
ret
.align 2
.Lld_int16:
movzwl -24(%rsp), %eax
ret
.align 2
.Lld_int32:
movl -24(%rsp), %eax
ret
.align 2
.Lld_int64:
movq -24(%rsp), %rax
ret
.align 2
.Lld_float:
movss -24(%rsp), %xmm0
ret
.align 2
.Lld_double:
movsd -24(%rsp), %xmm0
ret
.align 2
.Lld_ldouble:
fldt -24(%rsp)
ret
.align 2
.Lld_struct:
/* There are four possibilities here, %rax/%rdx, %xmm0/%rax,
%rax/%xmm0, %xmm0/%xmm1. We collapse two by always loading
both rdx and xmm1 with the second word. For the remaining,
bit 8 set means xmm0 gets the second word, and bit 9 means
that rax gets the second word. */
movq -24(%rsp), %rcx
movq -16(%rsp), %rdx
movq -16(%rsp), %xmm1
testl $0x100, %eax
cmovnz %rdx, %rcx
movd %rcx, %xmm0
testl $0x200, %eax
movq -24(%rsp), %rax
cmovnz %rdx, %rax
ret
/* See the comment above .Lload_sse; the same logic applies here. */
.align 2
.LUW8:
.Lsave_sse:
movdqa %xmm0, 48(%rsp)
movdqa %xmm1, 64(%rsp)
movdqa %xmm2, 80(%rsp)
movdqa %xmm3, 96(%rsp)
movdqa %xmm4, 112(%rsp)
movdqa %xmm5, 128(%rsp)
movdqa %xmm6, 144(%rsp)
movdqa %xmm7, 160(%rsp)
jmp .Lret_from_save_sse
.LUW9:
.size ffi_closure_unix64,.-ffi_closure_unix64
#ifdef __GNUC__
/* Only emit DWARF unwind info when building with the GNU toolchain. */
#ifdef HAVE_AS_X86_64_UNWIND_SECTION_TYPE
.section .eh_frame,"a",@unwind
#else
.section .eh_frame,"a",@progbits
#endif
.Lframe1:
.long .LECIE1-.LSCIE1 /* CIE Length */
.LSCIE1:
.long 0 /* CIE Identifier Tag */
.byte 1 /* CIE Version */
.ascii "zR\0" /* CIE Augmentation */
.uleb128 1 /* CIE Code Alignment Factor */
.sleb128 -8 /* CIE Data Alignment Factor */
.byte 0x10 /* CIE RA Column */
.uleb128 1 /* Augmentation size */
.byte 0x1b /* FDE Encoding (pcrel sdata4) */
.byte 0xc /* DW_CFA_def_cfa, %rsp offset 8 */
.uleb128 7
.uleb128 8
.byte 0x80+16 /* DW_CFA_offset, %rip offset 1*-8 */
.uleb128 1
.align 8
.LECIE1:
.LSFDE1:
.long .LEFDE1-.LASFDE1 /* FDE Length */
.LASFDE1:
.long .LASFDE1-.Lframe1 /* FDE CIE offset */
#if HAVE_AS_X86_PCREL
.long .LUW0-. /* FDE initial location */
#else
.long .LUW0@rel
#endif
.long .LUW4-.LUW0 /* FDE address range */
.uleb128 0x0 /* Augmentation size */
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW1-.LUW0
/* New stack frame based off rbp. This is a itty bit of unwind
trickery in that the CFA *has* changed. There is no easy way
to describe it correctly on entry to the function. Fortunately,
it doesn't matter too much since at all points we can correctly
unwind back to ffi_call. Note that the location to which we
moved the return address is (the new) CFA-8, so from the
perspective of the unwind info, it hasn't moved. */
.byte 0xc /* DW_CFA_def_cfa, %rbp offset 32 */
.uleb128 6
.uleb128 32
.byte 0x80+6 /* DW_CFA_offset, %rbp offset 2*-8 */
.uleb128 2
.byte 0xa /* DW_CFA_remember_state */
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW2-.LUW1
.byte 0xc /* DW_CFA_def_cfa, %rsp offset 8 */
.uleb128 7
.uleb128 8
.byte 0xc0+6 /* DW_CFA_restore, %rbp */
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW3-.LUW2
.byte 0xb /* DW_CFA_restore_state */
.align 8
.LEFDE1:
.LSFDE3:
.long .LEFDE3-.LASFDE3 /* FDE Length */
.LASFDE3:
.long .LASFDE3-.Lframe1 /* FDE CIE offset */
#if HAVE_AS_X86_PCREL
.long .LUW5-. /* FDE initial location */
#else
.long .LUW5@rel
#endif
.long .LUW9-.LUW5 /* FDE address range */
.uleb128 0x0 /* Augmentation size */
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW6-.LUW5
.byte 0xe /* DW_CFA_def_cfa_offset */
.uleb128 208
.byte 0xa /* DW_CFA_remember_state */
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW7-.LUW6
.byte 0xe /* DW_CFA_def_cfa_offset */
.uleb128 8
.byte 0x4 /* DW_CFA_advance_loc4 */
.long .LUW8-.LUW7
.byte 0xb /* DW_CFA_restore_state */
.align 8
.LEFDE3:
#endif /* __GNUC__ */
#endif /* __x86_64__ */
#if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",@progbits
#endif