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jlechner |
/* -----------------------------------------------------------------------
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unix64.S - Copyright (c) 2002 Bo Thorsen
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x86-64 Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#ifdef __x86_64__
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#define LIBFFI_ASM
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#include
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#include
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.text
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/* ffi_call_unix64 (void *args, unsigned long bytes, unsigned flags,
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void *raddr, void (*fnaddr)());
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Bit o trickiness here -- ARGS+BYTES is the base of the stack frame
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for this function. This has been allocated by ffi_call. We also
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deallocate some of the stack that has been alloca'd. */
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.align 2
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.globl ffi_call_unix64
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.type ffi_call_unix64,@function
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ffi_call_unix64:
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.LUW0:
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movq (%rsp), %r10 /* Load return address. */
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leaq (%rdi, %rsi), %rax /* Find local stack base. */
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movq %rdx, (%rax) /* Save flags. */
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movq %rcx, 8(%rax) /* Save raddr. */
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movq %rbp, 16(%rax) /* Save old frame pointer. */
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movq %r10, 24(%rax) /* Relocate return address. */
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movq %rax, %rbp /* Finalize local stack frame. */
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.LUW1:
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movq %rdi, %r10 /* Save a copy of the register area. */
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movq %r8, %r11 /* Save a copy of the target fn. */
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movl %r9d, %eax /* Set number of SSE registers. */
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/* Load up all argument registers. */
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movq (%r10), %rdi
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movq 8(%r10), %rsi
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movq 16(%r10), %rdx
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movq 24(%r10), %rcx
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movq 32(%r10), %r8
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movq 40(%r10), %r9
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testl %eax, %eax
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jnz .Lload_sse
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.Lret_from_load_sse:
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/* Deallocate the reg arg area. */
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leaq 176(%r10), %rsp
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/* Call the user function. */
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call *%r11
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/* Deallocate stack arg area; local stack frame in redzone. */
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leaq 24(%rbp), %rsp
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movq 0(%rbp), %rcx /* Reload flags. */
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movq 8(%rbp), %rdi /* Reload raddr. */
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movq 16(%rbp), %rbp /* Reload old frame pointer. */
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.LUW2:
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/* The first byte of the flags contains the FFI_TYPE. */
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movzbl %cl, %r10d
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leaq .Lstore_table(%rip), %r11
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movslq (%r11, %r10, 4), %r10
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addq %r11, %r10
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jmp *%r10
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.section .rodata
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.Lstore_table:
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.long .Lst_void-.Lstore_table /* FFI_TYPE_VOID */
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.long .Lst_sint32-.Lstore_table /* FFI_TYPE_INT */
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.long .Lst_float-.Lstore_table /* FFI_TYPE_FLOAT */
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.long .Lst_double-.Lstore_table /* FFI_TYPE_DOUBLE */
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.long .Lst_ldouble-.Lstore_table /* FFI_TYPE_LONGDOUBLE */
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.long .Lst_uint8-.Lstore_table /* FFI_TYPE_UINT8 */
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.long .Lst_sint8-.Lstore_table /* FFI_TYPE_SINT8 */
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.long .Lst_uint16-.Lstore_table /* FFI_TYPE_UINT16 */
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.long .Lst_sint16-.Lstore_table /* FFI_TYPE_SINT16 */
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.long .Lst_uint32-.Lstore_table /* FFI_TYPE_UINT32 */
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.long .Lst_sint32-.Lstore_table /* FFI_TYPE_SINT32 */
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.long .Lst_int64-.Lstore_table /* FFI_TYPE_UINT64 */
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.long .Lst_int64-.Lstore_table /* FFI_TYPE_SINT64 */
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.long .Lst_struct-.Lstore_table /* FFI_TYPE_STRUCT */
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.long .Lst_int64-.Lstore_table /* FFI_TYPE_POINTER */
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.text
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.align 2
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.Lst_void:
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ret
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.align 2
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.Lst_uint8:
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movzbq %al, %rax
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movq %rax, (%rdi)
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ret
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.align 2
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.Lst_sint8:
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movsbq %al, %rax
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movq %rax, (%rdi)
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ret
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.align 2
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.Lst_uint16:
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movzwq %ax, %rax
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movq %rax, (%rdi)
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.align 2
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.Lst_sint16:
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movswq %ax, %rax
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movq %rax, (%rdi)
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ret
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.align 2
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.Lst_uint32:
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movl %eax, %eax
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movq %rax, (%rdi)
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.align 2
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.Lst_sint32:
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cltq
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movq %rax, (%rdi)
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ret
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.align 2
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.Lst_int64:
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movq %rax, (%rdi)
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ret
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.align 2
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.Lst_float:
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movss %xmm0, (%rdi)
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ret
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.align 2
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.Lst_double:
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movsd %xmm0, (%rdi)
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ret
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.Lst_ldouble:
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fstpt (%rdi)
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ret
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.align 2
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.Lst_struct:
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leaq -20(%rsp), %rsi /* Scratch area in redzone. */
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/* We have to locate the values now, and since we don't want to
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write too much data into the user's return value, we spill the
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value to a 16 byte scratch area first. Bits 8, 9, and 10
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control where the values are located. Only one of the three
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bits will be set; see ffi_prep_cif_machdep for the pattern. */
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movd %xmm0, %r10
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movd %xmm1, %r11
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testl $0x100, %ecx
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cmovnz %rax, %rdx
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cmovnz %r10, %rax
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testl $0x200, %ecx
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cmovnz %r10, %rdx
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testl $0x400, %ecx
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cmovnz %r10, %rax
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cmovnz %r11, %rdx
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movq %rax, (%rsi)
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movq %rdx, 8(%rsi)
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/* Bits 12-31 contain the true size of the structure. Copy from
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the scratch area to the true destination. */
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shrl $12, %ecx
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rep movsb
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ret
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/* Many times we can avoid loading any SSE registers at all.
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It's not worth an indirect jump to load the exact set of
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SSE registers needed; zero or all is a good compromise. */
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.align 2
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.LUW3:
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.Lload_sse:
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movdqa 48(%r10), %xmm0
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movdqa 64(%r10), %xmm1
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movdqa 80(%r10), %xmm2
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movdqa 96(%r10), %xmm3
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movdqa 112(%r10), %xmm4
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movdqa 128(%r10), %xmm5
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movdqa 144(%r10), %xmm6
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movdqa 160(%r10), %xmm7
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jmp .Lret_from_load_sse
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.LUW4:
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.size ffi_call_unix64,.-ffi_call_unix64
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.align 2
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.globl ffi_closure_unix64
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.type ffi_closure_unix64,@function
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ffi_closure_unix64:
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.LUW5:
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/* The carry flag is set by the trampoline iff SSE registers
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are used. Don't clobber it before the branch instruction. */
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leaq -200(%rsp), %rsp
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.LUW6:
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movq %rdi, (%rsp)
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movq %rsi, 8(%rsp)
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movq %rdx, 16(%rsp)
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movq %rcx, 24(%rsp)
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movq %r8, 32(%rsp)
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movq %r9, 40(%rsp)
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jc .Lsave_sse
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.Lret_from_save_sse:
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movq %r10, %rdi
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leaq 176(%rsp), %rsi
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movq %rsp, %rdx
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leaq 208(%rsp), %rcx
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call ffi_closure_unix64_inner@PLT
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/* Deallocate stack frame early; return value is now in redzone. */
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addq $200, %rsp
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.LUW7:
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/* The first byte of the return value contains the FFI_TYPE. */
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movzbl %al, %r10d
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leaq .Lload_table(%rip), %r11
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movslq (%r11, %r10, 4), %r10
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addq %r11, %r10
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jmp *%r10
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.section .rodata
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.Lload_table:
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.long .Lld_void-.Lload_table /* FFI_TYPE_VOID */
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.long .Lld_int32-.Lload_table /* FFI_TYPE_INT */
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| 245 |
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.long .Lld_float-.Lload_table /* FFI_TYPE_FLOAT */
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| 246 |
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.long .Lld_double-.Lload_table /* FFI_TYPE_DOUBLE */
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| 247 |
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.long .Lld_ldouble-.Lload_table /* FFI_TYPE_LONGDOUBLE */
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| 248 |
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.long .Lld_int8-.Lload_table /* FFI_TYPE_UINT8 */
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| 249 |
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.long .Lld_int8-.Lload_table /* FFI_TYPE_SINT8 */
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.long .Lld_int16-.Lload_table /* FFI_TYPE_UINT16 */
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| 251 |
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.long .Lld_int16-.Lload_table /* FFI_TYPE_SINT16 */
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| 252 |
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.long .Lld_int32-.Lload_table /* FFI_TYPE_UINT32 */
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| 253 |
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.long .Lld_int32-.Lload_table /* FFI_TYPE_SINT32 */
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| 254 |
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.long .Lld_int64-.Lload_table /* FFI_TYPE_UINT64 */
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.long .Lld_int64-.Lload_table /* FFI_TYPE_SINT64 */
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| 256 |
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.long .Lld_struct-.Lload_table /* FFI_TYPE_STRUCT */
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| 257 |
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.long .Lld_int64-.Lload_table /* FFI_TYPE_POINTER */
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.text
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.align 2
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| 261 |
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.Lld_void:
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| 262 |
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ret
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| 263 |
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.align 2
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| 265 |
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.Lld_int8:
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movzbl -24(%rsp), %eax
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ret
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| 268 |
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.align 2
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| 269 |
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.Lld_int16:
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| 270 |
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movzwl -24(%rsp), %eax
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| 271 |
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ret
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.align 2
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| 273 |
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.Lld_int32:
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| 274 |
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movl -24(%rsp), %eax
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| 275 |
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ret
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| 276 |
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.align 2
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| 277 |
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.Lld_int64:
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| 278 |
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movq -24(%rsp), %rax
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| 279 |
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ret
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| 280 |
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| 281 |
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.align 2
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| 282 |
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.Lld_float:
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| 283 |
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movss -24(%rsp), %xmm0
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| 284 |
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ret
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| 285 |
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.align 2
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| 286 |
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.Lld_double:
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| 287 |
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movsd -24(%rsp), %xmm0
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| 288 |
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ret
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| 289 |
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.align 2
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| 290 |
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.Lld_ldouble:
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| 291 |
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fldt -24(%rsp)
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| 292 |
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ret
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| 293 |
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| 294 |
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.align 2
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| 295 |
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.Lld_struct:
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| 296 |
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/* There are four possibilities here, %rax/%rdx, %xmm0/%rax,
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| 297 |
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%rax/%xmm0, %xmm0/%xmm1. We collapse two by always loading
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| 298 |
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both rdx and xmm1 with the second word. For the remaining,
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| 299 |
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bit 8 set means xmm0 gets the second word, and bit 9 means
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| 300 |
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that rax gets the second word. */
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| 301 |
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movq -24(%rsp), %rcx
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| 302 |
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movq -16(%rsp), %rdx
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| 303 |
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movq -16(%rsp), %xmm1
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| 304 |
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testl $0x100, %eax
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| 305 |
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cmovnz %rdx, %rcx
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| 306 |
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movd %rcx, %xmm0
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| 307 |
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testl $0x200, %eax
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| 308 |
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movq -24(%rsp), %rax
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| 309 |
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cmovnz %rdx, %rax
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| 310 |
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ret
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| 311 |
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| 312 |
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/* See the comment above .Lload_sse; the same logic applies here. */
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| 313 |
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.align 2
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| 314 |
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.LUW8:
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| 315 |
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.Lsave_sse:
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| 316 |
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movdqa %xmm0, 48(%rsp)
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| 317 |
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movdqa %xmm1, 64(%rsp)
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| 318 |
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movdqa %xmm2, 80(%rsp)
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| 319 |
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movdqa %xmm3, 96(%rsp)
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| 320 |
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movdqa %xmm4, 112(%rsp)
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| 321 |
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movdqa %xmm5, 128(%rsp)
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| 322 |
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movdqa %xmm6, 144(%rsp)
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| 323 |
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movdqa %xmm7, 160(%rsp)
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| 324 |
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jmp .Lret_from_save_sse
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| 325 |
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| 326 |
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.LUW9:
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| 327 |
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.size ffi_closure_unix64,.-ffi_closure_unix64
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| 328 |
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| 329 |
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.section .eh_frame,"a",@progbits
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| 330 |
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.Lframe1:
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| 331 |
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.long .LECIE1-.LSCIE1 /* CIE Length */
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| 332 |
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.LSCIE1:
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| 333 |
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.long 0 /* CIE Identifier Tag */
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| 334 |
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.byte 1 /* CIE Version */
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| 335 |
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.ascii "zR\0" /* CIE Augmentation */
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| 336 |
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.uleb128 1 /* CIE Code Alignment Factor */
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| 337 |
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.sleb128 -8 /* CIE Data Alignment Factor */
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| 338 |
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.byte 0x10 /* CIE RA Column */
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| 339 |
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.uleb128 1 /* Augmentation size */
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| 340 |
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.byte 0x1b /* FDE Encoding (pcrel sdata4) */
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| 341 |
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.byte 0xc /* DW_CFA_def_cfa, %rsp offset 8 */
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| 342 |
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.uleb128 7
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| 343 |
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.uleb128 8
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| 344 |
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.byte 0x80+16 /* DW_CFA_offset, %rip offset 1*-8 */
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| 345 |
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.uleb128 1
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| 346 |
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.align 8
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| 347 |
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.LECIE1:
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| 348 |
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.LSFDE1:
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| 349 |
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.long .LEFDE1-.LASFDE1 /* FDE Length */
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| 350 |
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.LASFDE1:
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| 351 |
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.long .LASFDE1-.Lframe1 /* FDE CIE offset */
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| 352 |
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.long .LUW0-. /* FDE initial location */
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| 353 |
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.long .LUW4-.LUW0 /* FDE address range */
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| 354 |
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.uleb128 0x0 /* Augmentation size */
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| 355 |
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|
| 356 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
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| 357 |
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.long .LUW1-.LUW0
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| 358 |
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|
|
| 359 |
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/* New stack frame based off rbp. This is a itty bit of unwind
|
| 360 |
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trickery in that the CFA *has* changed. There is no easy way
|
| 361 |
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to describe it correctly on entry to the function. Fortunately,
|
| 362 |
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it doesn't matter too much since at all points we can correctly
|
| 363 |
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unwind back to ffi_call. Note that the location to which we
|
| 364 |
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moved the return address is (the new) CFA-8, so from the
|
| 365 |
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perspective of the unwind info, it hasn't moved. */
|
| 366 |
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.byte 0xc /* DW_CFA_def_cfa, %rbp offset 32 */
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| 367 |
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.uleb128 6
|
| 368 |
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.uleb128 32
|
| 369 |
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.byte 0x80+6 /* DW_CFA_offset, %rbp offset 2*-8 */
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| 370 |
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.uleb128 2
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| 371 |
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.byte 0xa /* DW_CFA_remember_state */
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| 372 |
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|
|
| 373 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
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| 374 |
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.long .LUW2-.LUW1
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| 375 |
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.byte 0xc /* DW_CFA_def_cfa, %rsp offset 8 */
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| 376 |
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.uleb128 7
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| 377 |
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.uleb128 8
|
| 378 |
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.byte 0xc0+6 /* DW_CFA_restore, %rbp */
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| 379 |
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|
|
| 380 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
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| 381 |
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.long .LUW3-.LUW2
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| 382 |
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.byte 0xb /* DW_CFA_restore_state */
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| 383 |
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|
|
| 384 |
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.align 8
|
| 385 |
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.LEFDE1:
|
| 386 |
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.LSFDE3:
|
| 387 |
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.long .LEFDE3-.LASFDE3 /* FDE Length */
|
| 388 |
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.LASFDE3:
|
| 389 |
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.long .LASFDE3-.Lframe1 /* FDE CIE offset */
|
| 390 |
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.long .LUW5-. /* FDE initial location */
|
| 391 |
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.long .LUW9-.LUW5 /* FDE address range */
|
| 392 |
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.uleb128 0x0 /* Augmentation size */
|
| 393 |
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|
| 394 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
|
| 395 |
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.long .LUW6-.LUW5
|
| 396 |
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.byte 0xe /* DW_CFA_def_cfa_offset */
|
| 397 |
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.uleb128 208
|
| 398 |
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.byte 0xa /* DW_CFA_remember_state */
|
| 399 |
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|
|
| 400 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
|
| 401 |
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.long .LUW7-.LUW6
|
| 402 |
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.byte 0xe /* DW_CFA_def_cfa_offset */
|
| 403 |
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.uleb128 8
|
| 404 |
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|
|
| 405 |
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.byte 0x4 /* DW_CFA_advance_loc4 */
|
| 406 |
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.long .LUW8-.LUW7
|
| 407 |
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.byte 0xb /* DW_CFA_restore_state */
|
| 408 |
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|
|
| 409 |
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.align 8
|
| 410 |
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.LEFDE3:
|
| 411 |
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|
|
| 412 |
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#endif /* __x86_64__ */
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