/* -----------------------------------------------------------------------
- sysv.S - Copyright (c) 1998 Cygnus Solutions
+ sysv.S - Copyright (c) 1998, 2008 Red Hat, Inc.
ARM Foreign Function Interface
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.
+ 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
-/* XXX these lose for some platforms, I'm sure. */
+#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
+
+#ifdef __ELF__
+#define LSYM(x) .x
+#else
+#define LSYM(x) x
+#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
+ ENTRY(\name)
+ 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. */
+_L__\name:
+.endm
+#else
+.macro ARM_FUNC_START name
+ .text
+ .align 0
+ .arm
+ ENTRY(\name)
+ 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: fn
+ @ 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)
-.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)
- # 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 epilogue
-
-# return INT
- cmp a4, #FFI_TYPE_INT
- streq a1, [a3]
- beq epilogue
-
-# return FLOAT
- cmp a4, #FFI_TYPE_FLOAT
- stfeqs f0, [a3]
- beq epilogue
-
-# return DOUBLE or LONGDOUBLE
- cmp a4, #FFI_TYPE_DOUBLE
- stfeqd f0, [a3]
-
-epilogue:
- ldmfd sp!, {a1-a4, fp, pc}
+ @ 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):
+ RETLDM "r0-r3,fp"
.ffi_call_SYSV_end:
+ UNWIND .fnend
.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
+
+/*
+ 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 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
+ .size CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)
+
+
+/* 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)
+
+#if defined __ELF__ && defined __linux__
+ .section .note.GNU-stack,"",%progbits
+#endif
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