| /* ----------------------------------------------------------------------- |
| sysv.S - Copyright (c) 2014 Sebastian Macke <sebastian@macke.de> |
| |
| OpenRISC 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> |
| |
| .text |
| .globl ffi_call_SYSV |
| .type ffi_call_SYSV, @function |
| /* |
| r3: size to allocate on stack |
| r4: extended cif structure |
| r5: function pointer ffi_prep_args |
| r6: ret address |
| r7: function to call |
| r8: flag for return type |
| */ |
| |
| ffi_call_SYSV: |
| /* Store registers used on stack */ |
| l.sw -4(r1), r9 /* return address */ |
| l.sw -8(r1), r1 /* stack address */ |
| l.sw -12(r1), r14 /* callee saved registers */ |
| l.sw -16(r1), r16 |
| l.sw -20(r1), r18 |
| l.sw -24(r1), r20 |
| |
| l.ori r14, r1, 0x0 /* save stack pointer */ |
| l.addi r1, r1, -24 |
| |
| l.ori r16, r7, 0x0 /* save function address */ |
| l.ori r18, r6, 0x0 /* save ret address */ |
| l.ori r20, r8, 0x0 /* save flag */ |
| |
| l.sub r1, r1, r3 /* reserve space on stack */ |
| |
| /* Call ffi_prep_args */ |
| l.ori r3, r1, 0x0 /* first argument stack address, second already ecif */ |
| l.jalr r5 |
| l.nop |
| |
| /* Load register arguments and call*/ |
| |
| l.lwz r3, 0(r1) |
| l.lwz r4, 4(r1) |
| l.lwz r5, 8(r1) |
| l.lwz r6, 12(r1) |
| l.lwz r7, 16(r1) |
| l.lwz r8, 20(r1) |
| l.ori r1, r11, 0x0 /* new stack pointer */ |
| l.jalr r16 |
| l.nop |
| |
| /* handle return values */ |
| |
| l.sfeqi r20, FFI_TYPE_STRUCT |
| l.bf ret /* structs don't return an rvalue */ |
| l.nop |
| |
| /* copy ret address */ |
| |
| l.sfeqi r20, FFI_TYPE_UINT64 |
| l.bnf four_byte_ret /* 8 byte value is returned */ |
| l.nop |
| |
| l.sw 4(r18), r12 |
| |
| four_byte_ret: |
| l.sw 0(r18), r11 |
| |
| ret: |
| /* return */ |
| l.ori r1, r14, 0x0 /* reset stack pointer */ |
| l.lwz r9, -4(r1) |
| l.lwz r1, -8(r1) |
| l.lwz r14, -12(r1) |
| l.lwz r16, -16(r1) |
| l.lwz r18, -20(r1) |
| l.lwz r20, -24(r1) |
| l.jr r9 |
| l.nop |
| |
| .size ffi_call_SYSV, .-ffi_call_SYSV |