/Modules/_ctypes/libffi_arm_wince/sysv.asm
http://unladen-swallow.googlecode.com/ · Assembly · 228 lines · 99 code · 46 blank · 83 comment · 0 complexity · f2349a7d1d803cfb746229de0437ccdb MD5 · raw file
- ; -----------------------------------------------------------------------
- ; sysv.S - Copyright (c) 1998 Red Hat, Inc.
- ;
- ; ARM 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 CYGNUS SOLUTIONS 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>
- ;#ifdef HAVE_MACHINE_ASM_H
- ;#include <machine/asm.h>
- ;#else
- ;#ifdef __USER_LABEL_PREFIX__
- ;#define CONCAT1(a, b) CONCAT2(a, b)
- ;#define CONCAT2(a, b) a ## b
- ;/* Use the right prefix for global labels. */
- ;#define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
- ;#else
- ;#define CNAME(x) x
- ;#endif
- ;#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
- ;#endif
- FFI_TYPE_VOID EQU 0
- FFI_TYPE_INT EQU 1
- FFI_TYPE_FLOAT EQU 2
- FFI_TYPE_DOUBLE EQU 3
- ;FFI_TYPE_LONGDOUBLE EQU 4
- FFI_TYPE_UINT8 EQU 5
- FFI_TYPE_SINT8 EQU 6
- FFI_TYPE_UINT16 EQU 7
- FFI_TYPE_SINT16 EQU 8
- FFI_TYPE_UINT32 EQU 9
- FFI_TYPE_SINT32 EQU 10
- FFI_TYPE_UINT64 EQU 11
- FFI_TYPE_SINT64 EQU 12
- FFI_TYPE_STRUCT EQU 13
- FFI_TYPE_POINTER EQU 14
- ; WinCE always uses software floating point (I think)
- __SOFTFP__ EQU {TRUE}
- AREA |.text|, CODE, ARM ; .text
- ; a1: ffi_prep_args
- ; a2: &ecif
- ; a3: cif->bytes
- ; a4: fig->flags
- ; sp+0: ecif.rvalue
- ; sp+4: fn
- ; This assumes we are using gas.
- ;ENTRY(ffi_call_SYSV)
- EXPORT |ffi_call_SYSV|
- |ffi_call_SYSV| PROC
- ; Save registers
- stmfd sp!, {a1-a4, fp, lr}
- mov fp, sp
- ; Make room for all of the new args.
- sub sp, fp, a3
- ; Place all of the ffi_prep_args in position
- mov ip, a1
- mov a1, sp
- ; a2 already set
- ; And call
- mov lr, pc
- mov pc, ip
- ; move first 4 parameters in registers
- ldr a1, [sp, #0]
- ldr a2, [sp, #4]
- ldr a3, [sp, #8]
- ldr a4, [sp, #12]
- ; and adjust stack
- ldr ip, [fp, #8]
- cmp ip, #16
- movge ip, #16
- add sp, sp, ip
- ; call function
- mov lr, pc
- ldr pc, [fp, #28]
- ; Remove the space we pushed for the args
- mov sp, fp
- ; Load a3 with the pointer to storage for the return value
- ldr a3, [sp, #24]
- ; Load a4 with the return type code
- ldr a4, [sp, #12]
- ; If the return value pointer is NULL, assume no return value.
- cmp a3, #0
- beq call_epilogue
- ; return INT
- cmp a4, #FFI_TYPE_INT
- streq a1, [a3]
- beq call_epilogue
- ; return FLOAT
- cmp a4, #FFI_TYPE_FLOAT
- [ __SOFTFP__ ;ifdef __SOFTFP__
- streq a1, [a3]
- | ;else
- stfeqs f0, [a3]
- ] ;endif
- beq call_epilogue
- ; return DOUBLE or LONGDOUBLE
- cmp a4, #FFI_TYPE_DOUBLE
- [ __SOFTFP__ ;ifdef __SOFTFP__
- stmeqia a3, {a1, a2}
- | ;else
- stfeqd f0, [a3]
- ] ;endif
- beq call_epilogue
- ; return SINT64 or UINT64
- cmp a4, #FFI_TYPE_SINT64
- stmeqia a3, {a1, a2}
- call_epilogue
- ldmfd sp!, {a1-a4, fp, pc}
- ;.ffi_call_SYSV_end:
- ;.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
- ENDP
- RESERVE_RETURN EQU 16
- ; This function is called by the trampoline
- ; It is NOT callable from C
- ; ip = pointer to struct ffi_closure
- IMPORT |ffi_closure_SYSV_inner|
- EXPORT |ffi_closure_SYSV|
- |ffi_closure_SYSV| PROC
- ; Store the argument registers on the stack
- stmfd sp!, {a1-a4}
- ; Push the return address onto the stack
- stmfd sp!, {lr}
- mov a1, ip ; first arg = address of ffi_closure
- add a2, sp, #4 ; second arg = sp+4 (points to saved a1)
- ; Allocate space for a non-struct return value
- sub sp, sp, #RESERVE_RETURN
- mov a3, sp ; third arg = return value address
- ; static unsigned int
- ; ffi_closure_SYSV_inner (ffi_closure *closure, char *in_args, void *rvalue)
- bl ffi_closure_SYSV_inner
- ; a1 now contains the return type code
- ; At this point the return value is on the stack
- ; Transfer it to the correct registers if necessary
- ; return INT
- cmp a1, #FFI_TYPE_INT
- ldreq a1, [sp]
- beq closure_epilogue
- ; return FLOAT
- cmp a1, #FFI_TYPE_FLOAT
- [ __SOFTFP__ ;ifdef __SOFTFP__
- ldreq a1, [sp]
- | ;else
- stfeqs f0, [sp]
- ] ;endif
- beq closure_epilogue
- ; return DOUBLE or LONGDOUBLE
- cmp a1, #FFI_TYPE_DOUBLE
- [ __SOFTFP__ ;ifdef __SOFTFP__
- ldmeqia sp, {a1, a2}
- | ;else
- stfeqd f0, [sp]
- ] ;endif
- beq closure_epilogue
- ; return SINT64 or UINT64
- cmp a1, #FFI_TYPE_SINT64
- ldmeqia sp, {a1, a2}
- closure_epilogue
- add sp, sp, #RESERVE_RETURN ; remove return value buffer
- ldmfd sp!, {ip} ; ip = pop return address
- add sp, sp, #16 ; remove saved argument registers {a1-a4} from the stack
- mov pc, ip ; return
- ENDP ; ffi_closure_SYSV
- END