/* ———————————————————————–
sysv.S - Copyright (c) 2022 Xu Chenghua <xuchenghua@loongson.cn>
2022 Cheng Lulu <chenglulu@loongson.cn>
LoongArch 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.
----------------------------------------------------------------------- */
define LIBFFI_ASM include <fficonfig.h> include <ffi.h>
/* Define aliases so that we can handle all ABIs uniformly. */
if SIZEOF_POINTER == 8 # define PTRS 8 # define LARG ld.d # define SARG st.d else # define PTRS 4 # define LARG ld.w # define SARG st.w endif
if defined(__loongarch_single_float) # define FLTS 4 # define FLD fld.w # define FST fst.w elif defined(__loongarch_double_float) # define FLTS 8 # define FLARG fld.d # define FSARG fst.d elif defined(__loongarch_soft_float) # define FLTS 0 else error unsupported LoongArch floating-point ABI endif
.text .globl ffi_call_asm .type ffi_call_asm, @function .hidden ffi_call_asm
/* struct call_context
{
ABI_FLOAT fa[8];
size_t a[10];
}
- 8 floating point parameter/result registers (fa[0] - fa[7])
- 8 integer parameter/result registers (a[0] - a[7])
- 2 registers used by the assembly code to in-place construct its own stack
frame.
- frame pointer (a[8])
- return address (a[9])
void ffi_call_asm (size_t *stackargs, struct call_context *regargs,
void (*fn)(void), void *closure); */
define FRAME_LEN (8 * FLTS + 10 * PTRS)
ffi_call_asm:
.cfi_startproc /* We are NOT going to set up an ordinary stack frame. In order to pass the stacked args to the called function, we adjust our stack pointer to a0, which is in the _caller's_ alloca area. We establish our own stack frame at the end of the call_context. Anything below the arguments will be freed at this point, although we preserve the call_context so that it can be read back in the caller. */ .cfi_def_cfa 5, FRAME_LEN # Interim CFA based on a1. SARG $fp, $a1, FRAME_LEN - 2*PTRS .cfi_offset 22, -2*PTRS SARG $ra, $a1, FRAME_LEN - 1*PTRS .cfi_offset 1, -1*PTRS addi.d $fp, $a1, FRAME_LEN move $sp, $a0 .cfi_def_cfa 22, 0 # Our frame is fully set up. # Load arguments. move $t1, $a2 move $t2, $a3
if FLTS
FLARG $fa0, $fp, -FRAME_LEN+0*FLTS FLARG $fa1, $fp, -FRAME_LEN+1*FLTS FLARG $fa2, $fp, -FRAME_LEN+2*FLTS FLARG $fa3, $fp, -FRAME_LEN+3*FLTS FLARG $fa4, $fp, -FRAME_LEN+4*FLTS FLARG $fa5, $fp, -FRAME_LEN+5*FLTS FLARG $fa6, $fp, -FRAME_LEN+6*FLTS FLARG $fa7, $fp, -FRAME_LEN+7*FLTS
endif
LARG $a0, $fp, -FRAME_LEN+8*FLTS+0*PTRS LARG $a1, $fp, -FRAME_LEN+8*FLTS+1*PTRS LARG $a2, $fp, -FRAME_LEN+8*FLTS+2*PTRS LARG $a3, $fp, -FRAME_LEN+8*FLTS+3*PTRS LARG $a4, $fp, -FRAME_LEN+8*FLTS+4*PTRS LARG $a5, $fp, -FRAME_LEN+8*FLTS+5*PTRS LARG $a6, $fp, -FRAME_LEN+8*FLTS+6*PTRS LARG $a7, $fp, -FRAME_LEN+8*FLTS+7*PTRS /* Call */ jirl $ra, $t1, 0
if FLTS
/* Save return values - only a0/a1 (fa0/fa1) are used. */ FSARG $fa0, $fp, -FRAME_LEN+0*FLTS FSARG $fa1, $fp, -FRAME_LEN+1*FLTS
endif
SARG $a0, $fp, -FRAME_LEN+8*FLTS+0*PTRS SARG $a1, $fp, -FRAME_LEN+8*FLTS+1*PTRS /* Restore and return. */ addi.d $sp, $fp, -FRAME_LEN .cfi_def_cfa 3, FRAME_LEN LARG $ra, $fp, -1*PTRS .cfi_restore 1 LARG $fp, $fp, -2*PTRS .cfi_restore 22 jr $ra .cfi_endproc .size ffi_call_asm, .-ffi_call_asm
/* ffi_closure_asm. Expects address of the passed-in ffi_closure in t0.
void ffi_closure_inner (ffi_cif *cif,
void (*fun)(ffi_cif *, void *, void **, void *),
void *user_data,
size_t *stackargs, struct call_context *regargs) */
.globl ffi_closure_asm
.hidden ffi_closure_asm
.type ffi_closure_asm, @function
ffi_closure_asm:
.cfi_startproc addi.d $sp, $sp, -FRAME_LEN .cfi_def_cfa_offset FRAME_LEN /* Make a frame. */ SARG $fp, $sp, FRAME_LEN - 2*PTRS .cfi_offset 22, -2*PTRS SARG $ra, $sp, FRAME_LEN - 1*PTRS .cfi_offset 1, -1*PTRS addi.d $fp, $sp, FRAME_LEN /* Save arguments. */
if FLTS
FSARG $fa0, $sp, 0*FLTS FSARG $fa1, $sp, 1*FLTS FSARG $fa2, $sp, 2*FLTS FSARG $fa3, $sp, 3*FLTS FSARG $fa4, $sp, 4*FLTS FSARG $fa5, $sp, 5*FLTS FSARG $fa6, $sp, 6*FLTS FSARG $fa7, $sp, 7*FLTS
endif
SARG $a0, $sp, 8*FLTS+0*PTRS SARG $a1, $sp, 8*FLTS+1*PTRS SARG $a2, $sp, 8*FLTS+2*PTRS SARG $a3, $sp, 8*FLTS+3*PTRS SARG $a4, $sp, 8*FLTS+4*PTRS SARG $a5, $sp, 8*FLTS+5*PTRS SARG $a6, $sp, 8*FLTS+6*PTRS SARG $a7, $sp, 8*FLTS+7*PTRS /* Enter C */ LARG $a0, $t0, FFI_TRAMPOLINE_SIZE+0*PTRS LARG $a1, $t0, FFI_TRAMPOLINE_SIZE+1*PTRS LARG $a2, $t0, FFI_TRAMPOLINE_SIZE+2*PTRS addi.d $a3, $sp, FRAME_LEN move $a4, $sp bl ffi_closure_inner /* Return values. */
if FLTS
FLARG $fa0, $sp, 0*FLTS FLARG $fa1, $sp, 1*FLTS
endif
LARG $a0, $sp, 8*FLTS+0*PTRS LARG $a1, $sp, 8*FLTS+1*PTRS /* Restore and return. */ LARG $ra, $sp, FRAME_LEN-1*PTRS .cfi_restore 1 LARG $fp, $sp, FRAME_LEN-2*PTRS .cfi_restore 22 addi.d $sp, $sp, FRAME_LEN .cfi_def_cfa_offset 0 jr $ra .cfi_endproc .size ffi_closure_asm, .-ffi_closure_asm
/* Static trampoline code table, in which each element is a trampoline.
The trampoline clobbers t0 and t1, but we don't save them on the stack because our psABI explicitly says they are scratch registers, at least for ELF. Our dynamic trampoline is already clobbering them anyway. The trampoline has two parameters - target code to jump to and data for the target code. The trampoline extracts the parameters from its parameter block (see tramp_table_map()). The trampoline saves the data address in t0 and jumps to the target code. As ffi_closure_asm() already expects the data address to be in t0, we don't need a "ffi_closure_asm_alt". */
if defined(FFI_EXEC_STATIC_TRAMP)
.align 16 .globl trampoline_code_table .hidden trampoline_code_table .type trampoline_code_table, @function
trampoline_code_table:
.rept 65536 / 16 pcaddu12i $t1, 16 # 65536 >> 12 ld.d $t0, $t1, 0 ld.d $t1, $t1, 8 jirl $zero, $t1, 0 .endr .size trampoline_code_table, .-trampoline_code_table .align 2
endif
/* ffi_go_closure_asm. Expects address of the passed-in ffi_go_closure in t2.
void ffi_closure_inner (ffi_cif *cif,
void (*fun)(ffi_cif *, void *, void **, void *),
void *user_data,
size_t *stackargs, struct call_context *regargs) */
.globl ffi_go_closure_asm
.hidden ffi_go_closure_asm
.type ffi_go_closure_asm, @function
ffi_go_closure_asm:
.cfi_startproc addi.d $sp, $sp, -FRAME_LEN .cfi_def_cfa_offset FRAME_LEN /* Make a frame. */ SARG $fp, $sp, FRAME_LEN - 2*PTRS .cfi_offset 22, -2*PTRS SARG $ra, $sp, FRAME_LEN - 1*PTRS .cfi_offset 1, -1*PTRS addi.d $fp, $sp, FRAME_LEN /* Save arguments. */
if FLTS
FSARG $fa0, $sp, 0*FLTS FSARG $fa1, $sp, 1*FLTS FSARG $fa2, $sp, 2*FLTS FSARG $fa3, $sp, 3*FLTS FSARG $fa4, $sp, 4*FLTS FSARG $fa5, $sp, 5*FLTS FSARG $fa6, $sp, 6*FLTS FSARG $fa7, $sp, 7*FLTS
endif
SARG $a0, $sp, 8*FLTS+0*PTRS SARG $a1, $sp, 8*FLTS+1*PTRS SARG $a2, $sp, 8*FLTS+2*PTRS SARG $a3, $sp, 8*FLTS+3*PTRS SARG $a4, $sp, 8*FLTS+4*PTRS SARG $a5, $sp, 8*FLTS+5*PTRS SARG $a6, $sp, 8*FLTS+6*PTRS SARG $a7, $sp, 8*FLTS+7*PTRS /* Enter C */ LARG $a0, $t2, 1*PTRS LARG $a1, $t2, 2*PTRS move $a2, $t2 addi.d $a3, $sp, FRAME_LEN move $a4, $sp bl ffi_closure_inner /* Return values. */
if FLTS
FLARG $fa0, $sp, 0*FLTS FLARG $fa1, $sp, 1*FLTS
endif
LARG $a0, $sp, 8*FLTS+0*PTRS LARG $a1, $sp, 8*FLTS+1*PTRS /* Restore and return. */ LARG $ra, $sp, FRAME_LEN-1*PTRS .cfi_restore 1 LARG $fp, $sp, FRAME_LEN-2*PTRS .cfi_restore 22 addi.d $sp, $sp, FRAME_LEN .cfi_def_cfa_offset 0 jr $ra .cfi_endproc .size ffi_go_closure_asm, .-ffi_go_closure_asm
if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",%progbits
endif