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+/* -----------------------------------------------------------------------
+ sysv.S - Copyright (c) 1998, 2008, 2011 Red Hat, Inc.
+ Copyright (c) 2011 Plausible Labs Cooperative, Inc.
+ Copyright (c) 2019 Microsoft Corporation.
+
+ 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>
+#include <ffi_cfi.h>
+#include "internal.h"
+#include "ksarm.h"
+
+
+ ; 8 byte aligned AREA to support 8 byte aligned jump tables
+ MACRO
+ NESTED_ENTRY_FFI $FuncName, $AreaName, $ExceptHandler
+
+ ; compute the function's labels
+ __DeriveFunctionLabels $FuncName
+
+ ; determine the area we will put the function into
+__FuncArea SETS "|.text|"
+ IF "$AreaName" != ""
+__FuncArea SETS "$AreaName"
+ ENDIF
+
+ ; set up the exception handler itself
+__FuncExceptionHandler SETS ""
+ IF "$ExceptHandler" != ""
+__FuncExceptionHandler SETS "|$ExceptHandler|"
+ ENDIF
+
+ ; switch to the specified area, jump tables require 8 byte alignment
+ AREA $__FuncArea,CODE,CODEALIGN,ALIGN=3,READONLY
+
+ ; export the function name
+ __ExportProc $FuncName
+
+ ; flush any pending literal pool stuff
+ ROUT
+
+ ; reset the state of the unwind code tracking
+ __ResetUnwindState
+
+ MEND
+
+; MACRO
+; TABLE_ENTRY $Type, $Table
+;$Type_$Table
+; MEND
+
+#define E(index,table) return_##index##_##table
+
+ ; r0: stack
+ ; r1: frame
+ ; r2: fn
+ ; r3: vfp_used
+
+ ; fake entry point exists only to generate exists only to
+ ; generate .pdata for exception unwinding
+ NESTED_ENTRY_FFI ffi_call_VFP_fake
+ PROLOG_PUSH {r11, lr} ; save fp and lr for unwind
+
+ ALTERNATE_ENTRY ffi_call_VFP
+ cmp r3, #3 ; load only d0 if possible
+ vldrle d0, [r0]
+ vldmgt r0, {d0-d7}
+ add r0, r0, #64 ; discard the vfp register args
+ b ffi_call_SYSV
+ NESTED_END ffi_call_VFP_fake
+
+ ; fake entry point exists only to generate exists only to
+ ; generate .pdata for exception unwinding
+ NESTED_ENTRY_FFI ffi_call_SYSV_fake
+ PROLOG_PUSH {r11, lr} ; save fp and lr for unwind
+
+ ALTERNATE_ENTRY ffi_call_SYSV
+ stm r1, {fp, lr}
+ mov fp, r1
+
+ mov sp, r0 ; install the stack pointer
+ mov lr, r2 ; move the fn pointer out of the way
+ ldr ip, [fp, #16] ; install the static chain
+ ldmia sp!, {r0-r3} ; move first 4 parameters in registers.
+ blx lr ; call fn
+
+ ; Load r2 with the pointer to storage for the return value
+ ; Load r3 with the return type code
+ ldr r2, [fp, #8]
+ ldr r3, [fp, #12]
+
+ ; Deallocate the stack with the arguments.
+ mov sp, fp
+
+ ; Store values stored in registers.
+ ALIGN 8
+ lsl r3, #3
+ add r3, r3, pc
+ add r3, #8
+ mov pc, r3
+
+
+E(ARM_TYPE_VFP_S, ffi_call)
+ ALIGN 8
+ vstr s0, [r2]
+ pop {fp,pc}
+E(ARM_TYPE_VFP_D, ffi_call)
+ ALIGN 8
+ vstr d0, [r2]
+ pop {fp,pc}
+E(ARM_TYPE_VFP_N, ffi_call)
+ ALIGN 8
+ vstm r2, {d0-d3}
+ pop {fp,pc}
+E(ARM_TYPE_INT64, ffi_call)
+ ALIGN 8
+ str r1, [r2, #4]
+ nop
+E(ARM_TYPE_INT, ffi_call)
+ ALIGN 8
+ str r0, [r2]
+ pop {fp,pc}
+E(ARM_TYPE_VOID, ffi_call)
+ ALIGN 8
+ pop {fp,pc}
+ nop
+E(ARM_TYPE_STRUCT, ffi_call)
+ ALIGN 8
+ cmp r3, #ARM_TYPE_STRUCT
+ pop {fp,pc}
+ NESTED_END ffi_call_SYSV_fake
+
+ IMPORT |ffi_closure_inner_SYSV|
+ /*
+ int ffi_closure_inner_SYSV
+ (
+ cif, ; r0
+ fun, ; r1
+ user_data, ; r2
+ frame ; r3
+ )
+ */
+
+ NESTED_ENTRY_FFI ffi_go_closure_SYSV
+ stmdb sp!, {r0-r3} ; save argument regs
+ ldr r0, [ip, #4] ; load cif
+ ldr r1, [ip, #8] ; load fun
+ mov r2, ip ; load user_data
+ b ffi_go_closure_SYSV_0
+ NESTED_END ffi_go_closure_SYSV
+
+ ; r3: ffi_closure
+
+ ; fake entry point exists only to generate exists only to
+ ; generate .pdata for exception unwinding
+ NESTED_ENTRY_FFI ffi_closure_SYSV_fake
+ PROLOG_PUSH {r11, lr} ; save fp and lr for unwind
+ ALTERNATE_ENTRY ffi_closure_SYSV
+ ldmfd sp!, {ip,r0} ; restore fp (r0 is used for stack alignment)
+ stmdb sp!, {r0-r3} ; save argument regs
+
+ ldr r0, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET] ; ffi_closure->cif
+ ldr r1, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET+4] ; ffi_closure->fun
+ ldr r2, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET+8] ; ffi_closure->user_data
+
+ ALTERNATE_ENTRY ffi_go_closure_SYSV_0
+ add ip, sp, #16 ; compute entry sp
+
+ sub sp, sp, #64+32 ; allocate frame parameter (sizeof(vfp_space) = 64, sizeof(result) = 32)
+ mov r3, sp ; set frame parameter
+ stmdb sp!, {ip,lr}
+
+ bl ffi_closure_inner_SYSV ; call the Python closure
+
+ ; Load values returned in registers.
+ add r2, sp, #64+8 ; address of closure_frame->result
+ bl ffi_closure_ret ; move result to correct register or memory for type
+
+ ldmfd sp!, {ip,lr}
+ mov sp, ip ; restore stack pointer
+ mov pc, lr
+ NESTED_END ffi_closure_SYSV_fake
+
+ IMPORT |ffi_closure_inner_VFP|
+ /*
+ int ffi_closure_inner_VFP
+ (
+ cif, ; r0
+ fun, ; r1
+ user_data, ; r2
+ frame ; r3
+ )
+ */
+
+ NESTED_ENTRY_FFI ffi_go_closure_VFP
+ stmdb sp!, {r0-r3} ; save argument regs
+ ldr r0, [ip, #4] ; load cif
+ ldr r1, [ip, #8] ; load fun
+ mov r2, ip ; load user_data
+ b ffi_go_closure_VFP_0
+ NESTED_END ffi_go_closure_VFP
+
+ ; fake entry point exists only to generate exists only to
+ ; generate .pdata for exception unwinding
+ ; r3: closure
+ NESTED_ENTRY_FFI ffi_closure_VFP_fake
+ PROLOG_PUSH {r11, lr} ; save fp and lr for unwind
+
+ ALTERNATE_ENTRY ffi_closure_VFP
+ ldmfd sp!, {ip,r0} ; restore fp (r0 is used for stack alignment)
+ stmdb sp!, {r0-r3} ; save argument regs
+
+ ldr r0, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET] ; load cif
+ ldr r1, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET+4] ; load fun
+ ldr r2, [ip, #FFI_TRAMPOLINE_CLOSURE_OFFSET+8] ; load user_data
+
+ ALTERNATE_ENTRY ffi_go_closure_VFP_0
+ add ip, sp, #16 ; compute entry sp
+ sub sp, sp, #32 ; save space for closure_frame->result
+ vstmdb sp!, {d0-d7} ; push closure_frame->vfp_space
+
+ mov r3, sp ; save closure_frame
+ stmdb sp!, {ip,lr}
+
+ bl ffi_closure_inner_VFP
+
+ ; Load values returned in registers.
+ add r2, sp, #64+8 ; load result
+ bl ffi_closure_ret
+ ldmfd sp!, {ip,lr}
+ mov sp, ip ; restore stack pointer
+ mov pc, lr
+ NESTED_END ffi_closure_VFP_fake
+
+/* Load values returned in registers for both closure entry points.
+ Note that we use LDM with SP in the register set. This is deprecated
+ by ARM, but not yet unpredictable. */
+
+ NESTED_ENTRY_FFI ffi_closure_ret
+ stmdb sp!, {fp,lr}
+
+ ALIGN 8
+ lsl r0, #3
+ add r0, r0, pc
+ add r0, #8
+ mov pc, r0
+
+E(ARM_TYPE_VFP_S, ffi_closure)
+ ALIGN 8
+ vldr s0, [r2]
+ b call_epilogue
+E(ARM_TYPE_VFP_D, ffi_closure)
+ ALIGN 8
+ vldr d0, [r2]
+ b call_epilogue
+E(ARM_TYPE_VFP_N, ffi_closure)
+ ALIGN 8
+ vldm r2, {d0-d3}
+ b call_epilogue
+E(ARM_TYPE_INT64, ffi_closure)
+ ALIGN 8
+ ldr r1, [r2, #4]
+ nop
+E(ARM_TYPE_INT, ffi_closure)
+ ALIGN 8
+ ldr r0, [r2]
+ b call_epilogue
+E(ARM_TYPE_VOID, ffi_closure)
+ ALIGN 8
+ b call_epilogue
+ nop
+E(ARM_TYPE_STRUCT, ffi_closure)
+ ALIGN 8
+ b call_epilogue
+call_epilogue
+ ldmfd sp!, {fp,pc}
+ NESTED_END ffi_closure_ret
+
+ AREA |.trampoline|, DATA, THUMB, READONLY
+ EXPORT |ffi_arm_trampoline|
+|ffi_arm_trampoline| DATA
+thisproc adr ip, thisproc
+ stmdb sp!, {ip, r0}
+ ldr pc, [pc, #0]
+ DCD 0
+ ;ENDP
+
+ END \ No newline at end of file
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