diff options
Diffstat (limited to 'ext/ffi_c/libffi/src/microblaze/sysv.S')
| -rw-r--r-- | ext/ffi_c/libffi/src/microblaze/sysv.S | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/ext/ffi_c/libffi/src/microblaze/sysv.S b/ext/ffi_c/libffi/src/microblaze/sysv.S new file mode 100644 index 0000000..ea43e9d --- /dev/null +++ b/ext/ffi_c/libffi/src/microblaze/sysv.S @@ -0,0 +1,302 @@ +/* ----------------------------------------------------------------------- + sysv.S - Copyright (c) 2012, 2013 Xilinx, Inc + + MicroBlaze 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> + + /* + * arg[0] (r5) = ffi_prep_args, + * arg[1] (r6) = &ecif, + * arg[2] (r7) = cif->bytes, + * arg[3] (r8) = cif->flags, + * arg[4] (r9) = ecif.rvalue, + * arg[5] (r10) = fn + * arg[6] (sp[0]) = cif->rtype->type + * arg[7] (sp[4]) = cif->rtype->size + */ + .text + .globl ffi_call_SYSV + .type ffi_call_SYSV, @function +ffi_call_SYSV: + /* push callee saves */ + addik r1, r1, -20 + swi r19, r1, 0 /* Frame Pointer */ + swi r20, r1, 4 /* PIC register */ + swi r21, r1, 8 /* PIC register */ + swi r22, r1, 12 /* save for locals */ + swi r23, r1, 16 /* save for locals */ + + /* save the r5-r10 registers in the stack */ + addik r1, r1, -24 /* increment sp to store 6x 32-bit words */ + swi r5, r1, 0 + swi r6, r1, 4 + swi r7, r1, 8 + swi r8, r1, 12 + swi r9, r1, 16 + swi r10, r1, 20 + + /* save function pointer */ + addik r3, r5, 0 /* copy ffi_prep_args into r3 */ + addik r22, r1, 0 /* save sp for unallocated args into r22 (callee-saved) */ + addik r23, r10, 0 /* save function address into r23 (callee-saved) */ + + /* prepare stack with allocation for n (bytes = r7) args */ + rsub r1, r7, r1 /* subtract bytes from sp */ + + /* prep args for ffi_prep_args call */ + addik r5, r1, 0 /* store stack pointer into arg[0] */ + /* r6 still holds ecif for arg[1] */ + + /* Call ffi_prep_args(stack, &ecif). */ + addik r1, r1, -4 + swi r15, r1, 0 /* store the link register in the frame */ + brald r15, r3 + nop /* branch has delay slot */ + lwi r15, r1, 0 + addik r1, r1, 4 /* restore the link register from the frame */ + /* returns calling stack pointer location */ + + /* prepare args for fn call, prep_args populates them onto the stack */ + lwi r5, r1, 0 /* arg[0] */ + lwi r6, r1, 4 /* arg[1] */ + lwi r7, r1, 8 /* arg[2] */ + lwi r8, r1, 12 /* arg[3] */ + lwi r9, r1, 16 /* arg[4] */ + lwi r10, r1, 20 /* arg[5] */ + + /* call (fn) (...). */ + addik r1, r1, -4 + swi r15, r1, 0 /* store the link register in the frame */ + brald r15, r23 + nop /* branch has delay slot */ + lwi r15, r1, 0 + addik r1, r1, 4 /* restore the link register from the frame */ + + /* Remove the space we pushed for the args. */ + addik r1, r22, 0 /* restore old SP */ + + /* restore this functions parameters */ + lwi r5, r1, 0 /* arg[0] */ + lwi r6, r1, 4 /* arg[1] */ + lwi r7, r1, 8 /* arg[2] */ + lwi r8, r1, 12 /* arg[3] */ + lwi r9, r1, 16 /* arg[4] */ + lwi r10, r1, 20 /* arg[5] */ + addik r1, r1, 24 /* decrement sp to de-allocate 6x 32-bit words */ + + /* If the return value pointer is NULL, assume no return value. */ + beqi r9, ffi_call_SYSV_end + + lwi r22, r1, 48 /* get return type (20 for locals + 28 for arg[6]) */ + lwi r23, r1, 52 /* get return size (20 for locals + 32 for arg[7]) */ + + /* Check if return type is actually a struct, do nothing */ + rsubi r11, r22, FFI_TYPE_STRUCT + beqi r11, ffi_call_SYSV_end + + /* Return 8bit */ + rsubi r11, r23, 1 + beqi r11, ffi_call_SYSV_store8 + + /* Return 16bit */ + rsubi r11, r23, 2 + beqi r11, ffi_call_SYSV_store16 + + /* Return 32bit */ + rsubi r11, r23, 4 + beqi r11, ffi_call_SYSV_store32 + + /* Return 64bit */ + rsubi r11, r23, 8 + beqi r11, ffi_call_SYSV_store64 + + /* Didn't match anything */ + bri ffi_call_SYSV_end + +ffi_call_SYSV_store64: + swi r3, r9, 0 /* store word r3 into return value */ + swi r4, r9, 4 /* store word r4 into return value */ + bri ffi_call_SYSV_end + +ffi_call_SYSV_store32: + swi r3, r9, 0 /* store word r3 into return value */ + bri ffi_call_SYSV_end + +ffi_call_SYSV_store16: +#ifdef __BIG_ENDIAN__ + shi r3, r9, 2 /* store half-word r3 into return value */ +#else + shi r3, r9, 0 /* store half-word r3 into return value */ +#endif + bri ffi_call_SYSV_end + +ffi_call_SYSV_store8: +#ifdef __BIG_ENDIAN__ + sbi r3, r9, 3 /* store byte r3 into return value */ +#else + sbi r3, r9, 0 /* store byte r3 into return value */ +#endif + bri ffi_call_SYSV_end + +ffi_call_SYSV_end: + /* callee restores */ + lwi r19, r1, 0 /* frame pointer */ + lwi r20, r1, 4 /* PIC register */ + lwi r21, r1, 8 /* PIC register */ + lwi r22, r1, 12 + lwi r23, r1, 16 + addik r1, r1, 20 + + /* return from sub-routine (with delay slot) */ + rtsd r15, 8 + nop + + .size ffi_call_SYSV, . - ffi_call_SYSV + +/* ------------------------------------------------------------------------- */ + + /* + * args passed into this function, are passed down to the callee. + * this function is the target of the closure trampoline, as such r12 is + * a pointer to the closure object. + */ + .text + .globl ffi_closure_SYSV + .type ffi_closure_SYSV, @function +ffi_closure_SYSV: + /* push callee saves */ + addik r11, r1, 28 /* save stack args start location (excluding regs/link) */ + addik r1, r1, -12 + swi r19, r1, 0 /* Frame Pointer */ + swi r20, r1, 4 /* PIC register */ + swi r21, r1, 8 /* PIC register */ + + /* store register args on stack */ + addik r1, r1, -24 + swi r5, r1, 0 + swi r6, r1, 4 + swi r7, r1, 8 + swi r8, r1, 12 + swi r9, r1, 16 + swi r10, r1, 20 + + /* setup args */ + addik r5, r1, 0 /* register_args */ + addik r6, r11, 0 /* stack_args */ + addik r7, r12, 0 /* closure object */ + addik r1, r1, -8 /* allocate return value */ + addik r8, r1, 0 /* void* rvalue */ + addik r1, r1, -8 /* allocate for return type/size values */ + addik r9, r1, 0 /* void* rtype */ + addik r10, r1, 4 /* void* rsize */ + + /* call the wrap_call function */ + addik r1, r1, -28 /* allocate args + link reg */ + swi r15, r1, 0 /* store the link register in the frame */ + brald r15, r3 + nop /* branch has delay slot */ + lwi r15, r1, 0 + addik r1, r1, 28 /* restore the link register from the frame */ + +ffi_closure_SYSV_prepare_return: + lwi r9, r1, 0 /* rtype */ + lwi r10, r1, 4 /* rsize */ + addik r1, r1, 8 /* de-allocate return info values */ + + /* Check if return type is actually a struct, store 4 bytes */ + rsubi r11, r9, FFI_TYPE_STRUCT + beqi r11, ffi_closure_SYSV_store32 + + /* Return 8bit */ + rsubi r11, r10, 1 + beqi r11, ffi_closure_SYSV_store8 + + /* Return 16bit */ + rsubi r11, r10, 2 + beqi r11, ffi_closure_SYSV_store16 + + /* Return 32bit */ + rsubi r11, r10, 4 + beqi r11, ffi_closure_SYSV_store32 + + /* Return 64bit */ + rsubi r11, r10, 8 + beqi r11, ffi_closure_SYSV_store64 + + /* Didn't match anything */ + bri ffi_closure_SYSV_end + +ffi_closure_SYSV_store64: + lwi r3, r1, 0 /* store word r3 into return value */ + lwi r4, r1, 4 /* store word r4 into return value */ + /* 64 bits == 2 words, no sign extend occurs */ + bri ffi_closure_SYSV_end + +ffi_closure_SYSV_store32: + lwi r3, r1, 0 /* store word r3 into return value */ + /* 32 bits == 1 word, no sign extend occurs */ + bri ffi_closure_SYSV_end + +ffi_closure_SYSV_store16: +#ifdef __BIG_ENDIAN__ + lhui r3, r1, 2 /* store half-word r3 into return value */ +#else + lhui r3, r1, 0 /* store half-word r3 into return value */ +#endif + rsubi r11, r9, FFI_TYPE_SINT16 + bnei r11, ffi_closure_SYSV_end + sext16 r3, r3 /* fix sign extend of sint8 */ + bri ffi_closure_SYSV_end + +ffi_closure_SYSV_store8: +#ifdef __BIG_ENDIAN__ + lbui r3, r1, 3 /* store byte r3 into return value */ +#else + lbui r3, r1, 0 /* store byte r3 into return value */ +#endif + rsubi r11, r9, FFI_TYPE_SINT8 + bnei r11, ffi_closure_SYSV_end + sext8 r3, r3 /* fix sign extend of sint8 */ + bri ffi_closure_SYSV_end + +ffi_closure_SYSV_end: + addik r1, r1, 8 /* de-allocate return value */ + + /* de-allocate stored args */ + addik r1, r1, 24 + + /* callee restores */ + lwi r19, r1, 0 /* frame pointer */ + lwi r20, r1, 4 /* PIC register */ + lwi r21, r1, 8 /* PIC register */ + addik r1, r1, 12 + + /* return from sub-routine (with delay slot) */ + rtsd r15, 8 + nop + + .size ffi_closure_SYSV, . - ffi_closure_SYSV |