/* -----------------------------------------------------------------------
sysv.S - Copyright (c) 1998, 2008, 2011 Red Hat, Inc.
Copyright (c) 2011 Plausible Labs Cooperative, 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 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>
#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
#ifdef __APPLE__
#define ENTRY(x) .globl CNAME(x); CNAME(x):
#else
#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
#endif /* __APPLE__ */
#endif
#ifdef __ELF__
#define LSYM(x) .x
#else
#define LSYM(x) x
#endif
/* Use the SOFTFP return value ABI on Mac OS X, as per the iOS ABI
Function Call Guide */
#ifdef __APPLE__
#define __SOFTFP__
#endif
/* We need a better way of testing for this, but for now, this is all
we can do. */
@ This selects the minimum architecture level required.
#define __ARM_ARCH__ 3
#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 4
#endif
#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
|| defined(__ARM_ARCH_5TEJ__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 5
#endif
#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
|| defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
|| defined(__ARM_ARCH_6M__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 6
#endif
#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
|| defined(__ARM_ARCH_7EM__)
# undef __ARM_ARCH__
# define __ARM_ARCH__ 7
#endif
#if __ARM_ARCH__ >= 5
# define call_reg(x) blx x
#elif defined (__ARM_ARCH_4T__)
# define call_reg(x) mov lr, pc ; bx x
# if defined(__thumb__) || defined(__THUMB_INTERWORK__)
# define __INTERWORKING__
# endif
#else
# define call_reg(x) mov lr, pc ; mov pc, x
#endif
/* Conditionally compile unwinder directives. */
#ifdef __ARM_EABI__
#define UNWIND
#else
#define UNWIND @
#endif
#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
.macro ARM_FUNC_START name
.text
.align 0
.thumb
.thumb_func
#ifdef __APPLE__
ENTRY($0)
#else
ENTRY(\name)
#endif
bx pc
nop
.arm
UNWIND .fnstart
/* A hook to tell gdb that we've switched to ARM mode. Also used to call
directly from other local arm routines. */
#ifdef __APPLE__
_L__$0:
#else
_L__\name:
#endif
.endm
#else
.macro ARM_FUNC_START name
.text
.align 0
.arm
#ifdef __APPLE__
ENTRY($0)
#else
ENTRY(\name)
#endif
UNWIND .fnstart
.endm
#endif
.macro RETLDM regs=, cond=, dirn=ia
#if defined (__INTERWORKING__)
.ifc "\regs",""
ldr\cond lr, [sp], #4
.else
ldm\cond\dirn sp!, {\regs, lr}
.endif
bx\cond lr
#else
.ifc "\regs",""
ldr\cond pc, [sp], #4
.else
ldm\cond\dirn sp!, {\regs, pc}
.endif
#endif
.endm
@ r0: ffi_prep_args
@ r1: &ecif
@ r2: cif->bytes
@ r3: fig->flags
@ sp+0: ecif.rvalue
@ This assumes we are using gas.
ARM_FUNC_START ffi_call_SYSV
@ Save registers
stmfd sp!, {r0-r3, fp, lr}
UNWIND .save {r0-r3, fp, lr}
mov fp, sp
UNWIND .setfp fp, sp
@ Make room for all of the new args.
sub sp, fp, r2
@ Place all of the ffi_prep_args in position
mov r0, sp
@ r1 already set
@ Call ffi_prep_args(stack, &ecif)
bl ffi_prep_args
@ move first 4 parameters in registers
ldmia sp, {r0-r3}
@ and adjust stack
sub lr, fp, sp @ cif->bytes == fp - sp
ldr ip, [fp] @ load fn() in advance
cmp lr, #16
movhs lr, #16
add sp, sp, lr
@ call (fn) (...)
call_reg(ip)
@ Remove the space we pushed for the args
mov sp, fp
@ Load r2 with the pointer to storage for the return value
ldr r2, [sp, #24]
@ Load r3 with the return type code
ldr r3, [sp, #12]
@ If the return value pointer is NULL, assume no return value.
cmp r2, #0
beq LSYM(Lepilogue)
@ return INT
cmp r3, #FFI_TYPE_INT
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
cmpne r3, #FFI_TYPE_FLOAT
#endif
streq r0, [r2]
beq LSYM(Lepilogue)
@ return INT64
cmp r3, #FFI_TYPE_SINT64
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
cmpne r3, #FFI_TYPE_DOUBLE
#endif
stmeqia r2, {r0, r1}
#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
beq LSYM(Lepilogue)
@ return FLOAT
cmp r3, #FFI_TYPE_FLOAT
stfeqs f0, [r2]
beq LSYM(Lepilogue)
@ return DOUBLE or LONGDOUBLE
cmp r3, #FFI_TYPE_DOUBLE
stfeqd f0, [r2]
#endif
LSYM(Lepilogue):
#if defined (__INTERWORKING__)
ldmia sp!, {r0-r3,fp, lr}
bx lr
#else
ldmia sp!, {r0-r3,fp, pc}
#endif
.ffi_call_SYSV_end:
UNWIND .fnend
#ifdef __ELF__
.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
#endif
/*
unsigned int FFI_HIDDEN
ffi_closure_SYSV_inner (closure, respp, args)
ffi_closure *closure;
void **respp;
void *args;
*/
ARM_FUNC_START ffi_closure_SYSV
UNWIND .pad #16
add ip, sp, #16
stmfd sp!, {ip, lr}
UNWIND .save {r0, lr}
add r2, sp, #8
UNWIND .pad #16
sub sp, sp, #16
str sp, [sp, #8]
add r1, sp, #8
bl CNAME(ffi_closure_SYSV_inner)
cmp r0, #FFI_TYPE_INT
beq .Lretint
cmp r0, #FFI_TYPE_FLOAT
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
beq .Lretint
#else
beq .Lretfloat
#endif
cmp r0, #FFI_TYPE_DOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
beq .Lretlonglong
#else
beq .Lretdouble
#endif
cmp r0, #FFI_TYPE_LONGDOUBLE
#if defined(__SOFTFP__) || defined(__ARM_EABI__)
beq .Lretlonglong
#else
beq .Lretlongdouble
#endif
cmp r0, #FFI_TYPE_SINT64
beq .Lretlonglong
.Lclosure_epilogue:
add sp, sp, #16
ldmfd sp, {sp, pc}
.Lretint:
ldr r0, [sp]
b .Lclosure_epilogue
.Lretlonglong:
ldr r0, [sp]
ldr r1, [sp, #4]
b .Lclosure_epilogue
#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
.Lretfloat:
ldfs f0, [sp]
b .Lclosure_epilogue
.Lretdouble:
ldfd f0, [sp]
b .Lclosure_epilogue
.Lretlongdouble:
ldfd f0, [sp]
b .Lclosure_epilogue
#endif
.ffi_closure_SYSV_end:
UNWIND .fnend
#ifdef __ELF__
.size CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)
#endif
/* Below are VFP hard-float ABI call and closure implementations.
Add VFP FPU directive here. */
.fpu vfp
@ r0: fn
@ r1: &ecif
@ r2: cif->bytes
@ r3: fig->flags
@ sp+0: ecif.rvalue
ARM_FUNC_START ffi_call_VFP
@ Save registers
stmfd sp!, {r0-r3, fp, lr}
UNWIND .save {r0-r3, fp, lr}
mov fp, sp
UNWIND .setfp fp, sp
@ Make room for all of the new args.
sub sp, sp, r2
@ Make room for loading VFP args
sub sp, sp, #64
@ Place all of the ffi_prep_args in position
mov r0, sp
@ r1 already set
sub r2, fp, #64 @ VFP scratch space
@ Call ffi_prep_args(stack, &ecif, vfp_space)
bl ffi_prep_args
@ Load VFP register args if needed
cmp r0, #0
beq LSYM(Lbase_args)
@ Load only d0 if possible
cmp r0, #3
sub ip, fp, #64
flddle d0, [ip]
fldmiadgt ip, {d0-d7}
LSYM(Lbase_args):
@ move first 4 parameters in registers
ldmia sp, {r0-r3}
@ and adjust stack
sub lr, ip, sp @ cif->bytes == (fp - 64) - sp
ldr ip, [fp] @ load fn() in advance
cmp lr, #16
movhs lr, #16
add sp, sp, lr
@ call (fn) (...)
call_reg(ip)
@ Remove the space we pushed for the args
mov sp, fp
@ Load r2 with the pointer to storage for
@ the return value
ldr r2, [sp, #24]
@ Load r3 with the return type code
ldr r3, [sp, #12]
@ If the return value pointer is NULL,
@ assume no return value.
cmp r2, #0
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_INT
streq r0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_SINT64
stmeqia r2, {r0, r1}
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_FLOAT
fstseq s0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_DOUBLE
fstdeq d0, [r2]
beq LSYM(Lepilogue_vfp)
cmp r3, #FFI_TYPE_STRUCT_VFP_FLOAT
cmpne r3, #FFI_TYPE_STRUCT_VFP_DOUBLE
fstmiadeq r2, {d0-d3}
LSYM(Lepilogue_vfp):
RETLDM "r0-r3,fp"
.ffi_call_VFP_end:
UNWIND .fnend
.size CNAME(ffi_call_VFP),.ffi_call_VFP_end-CNAME(ffi_call_VFP)
ARM_FUNC_START ffi_closure_VFP
fstmfdd sp!, {d0-d7}
@ r0-r3, then d0-d7
UNWIND .pad #80
add ip, sp, #80
stmfd sp!, {ip, lr}
UNWIND .save {r0, lr}
add r2, sp, #72
add r3, sp, #8
UNWIND .pad #72
sub sp, sp, #72
str sp, [sp, #64]
add r1, sp, #64
bl ffi_closure_SYSV_inner
cmp r0, #FFI_TYPE_INT
beq .Lretint_vfp
cmp r0, #FFI_TYPE_FLOAT
beq .Lretfloat_vfp
cmp r0, #FFI_TYPE_DOUBLE
cmpne r0, #FFI_TYPE_LONGDOUBLE
beq .Lretdouble_vfp
cmp r0, #FFI_TYPE_SINT64
beq .Lretlonglong_vfp
cmp r0, #FFI_TYPE_STRUCT_VFP_FLOAT
beq .Lretfloat_struct_vfp
cmp r0, #FFI_TYPE_STRUCT_VFP_DOUBLE
beq .Lretdouble_struct_vfp
.Lclosure_epilogue_vfp:
add sp, sp, #72
ldmfd sp, {sp, pc}
.Lretfloat_vfp:
flds s0, [sp]
b .Lclosure_epilogue_vfp
.Lretdouble_vfp:
fldd d0, [sp]
b .Lclosure_epilogue_vfp
.Lretint_vfp:
ldr r0, [sp]
b .Lclosure_epilogue_vfp
.Lretlonglong_vfp:
ldmia sp, {r0, r1}
b .Lclosure_epilogue_vfp
.Lretfloat_struct_vfp:
fldmiad sp, {d0-d1}
b .Lclosure_epilogue_vfp
.Lretdouble_struct_vfp:
fldmiad sp, {d0-d3}
b .Lclosure_epilogue_vfp
.ffi_closure_VFP_end:
UNWIND .fnend
.size CNAME(ffi_closure_VFP),.ffi_closure_VFP_end-CNAME(ffi_closure_VFP)
ENTRY(ffi_arm_trampoline)
stmfd sp!, {r0-r3}
ldr r0, [pc]
ldr pc, [pc]
#if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",%progbits
#endif
