diff options
Diffstat (limited to 'ext/ffi_c/libffi/src/xtensa/sysv.S')
| -rw-r--r-- | ext/ffi_c/libffi/src/xtensa/sysv.S | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/ext/ffi_c/libffi/src/xtensa/sysv.S b/ext/ffi_c/libffi/src/xtensa/sysv.S new file mode 100644 index 0000000..64e6a09 --- /dev/null +++ b/ext/ffi_c/libffi/src/xtensa/sysv.S @@ -0,0 +1,253 @@ +/* ----------------------------------------------------------------------- + sysv.S - Copyright (c) 2013 Tensilica, Inc. + + XTENSA 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> + +#define ENTRY(name) .text; .globl name; .type name,@function; .align 4; name: +#define END(name) .size name , . - name + +/* Assert that the table below is in sync with ffi.h. */ + +#if FFI_TYPE_UINT8 != 5 \ + || FFI_TYPE_SINT8 != 6 \ + || FFI_TYPE_UINT16 != 7 \ + || FFI_TYPE_SINT16 != 8 \ + || FFI_TYPE_UINT32 != 9 \ + || FFI_TYPE_SINT32 != 10 \ + || FFI_TYPE_UINT64 != 11 +#error "xtensa/sysv.S out of sync with ffi.h" +#endif + + +/* ffi_call_SYSV (rvalue, rbytes, flags, (*fnaddr)(), bytes, ecif) + void *rvalue; a2 + unsigned long rbytes; a3 + unsigned flags; a4 + void (*fnaddr)(); a5 + unsigned long bytes; a6 + extended_cif* ecif) a7 +*/ + +ENTRY(ffi_call_SYSV) + + entry a1, 32 # 32 byte frame for using call8 below + + mov a10, a7 # a10(->arg0): ecif + sub a11, a1, a6 # a11(->arg1): stack pointer + mov a7, a1 # fp + movsp a1, a11 # set new sp = old_sp - bytes + + movi a8, ffi_prep_args + callx8 a8 # ffi_prep_args(ecif, stack) + + # prepare to move stack pointer back up to 6 arguments + # note that 'bytes' is already aligned + + movi a10, 6*4 + sub a11, a6, a10 + movgez a6, a10, a11 + add a6, a1, a6 + + + # we can pass up to 6 arguments in registers + # for simplicity, just load 6 arguments + # (the stack size is at least 32 bytes, so no risk to cross boundaries) + + l32i a10, a1, 0 + l32i a11, a1, 4 + l32i a12, a1, 8 + l32i a13, a1, 12 + l32i a14, a1, 16 + l32i a15, a1, 20 + + # move stack pointer + + movsp a1, a6 + + callx8 a5 # (*fn)(args...) + + # Handle return value(s) + + beqz a2, .Lexit + + movi a5, FFI_TYPE_STRUCT + bne a4, a5, .Lstore + movi a5, 16 + blt a5, a3, .Lexit + + s32i a10, a2, 0 + blti a3, 5, .Lexit + addi a3, a3, -1 + s32i a11, a2, 4 + blti a3, 8, .Lexit + s32i a12, a2, 8 + blti a3, 12, .Lexit + s32i a13, a2, 12 + +.Lexit: retw + +.Lstore: + addi a4, a4, -FFI_TYPE_UINT8 + bgei a4, 7, .Lexit # should never happen + movi a6, store_calls + add a4, a4, a4 + addx4 a6, a4, a6 # store_table + idx * 8 + jx a6 + + .align 8 +store_calls: + # UINT8 + s8i a10, a2, 0 + retw + + # SINT8 + .align 8 + s8i a10, a2, 0 + retw + + # UINT16 + .align 8 + s16i a10, a2, 0 + retw + + # SINT16 + .align 8 + s16i a10, a2, 0 + retw + + # UINT32 + .align 8 + s32i a10, a2, 0 + retw + + # SINT32 + .align 8 + s32i a10, a2, 0 + retw + + # UINT64 + .align 8 + s32i a10, a2, 0 + s32i a11, a2, 4 + retw + +END(ffi_call_SYSV) + + +/* + * void ffi_cacheflush (unsigned long start, unsigned long end) + */ + +#define EXTRA_ARGS_SIZE 24 + +ENTRY(ffi_cacheflush) + + entry a1, 16 + +1: dhwbi a2, 0 + ihi a2, 0 + addi a2, a2, 4 + blt a2, a3, 1b + + retw + +END(ffi_cacheflush) + +/* ffi_trampoline is copied to the stack */ + +ENTRY(ffi_trampoline) + + entry a1, 16 + (FFI_REGISTER_NARGS * 4) + (4 * 4) # [ 0] + j 2f # [ 3] + .align 4 # [ 6] +1: .long 0 # [ 8] +2: l32r a15, 1b # [12] + _mov a14, a0 # [15] + callx0 a15 # [18] + # [21] +END(ffi_trampoline) + +/* + * ffi_closure() + * + * a0: closure + 21 + * a14: return address (a0) + */ + +ENTRY(ffi_closure_SYSV) + + /* intentionally omitting entry here */ + + # restore return address (a0) and move pointer to closure to a10 + addi a10, a0, -21 + mov a0, a14 + + # allow up to 4 arguments as return values + addi a11, a1, 4 * 4 + + # save up to 6 arguments to stack (allocated by entry below) + s32i a2, a11, 0 + s32i a3, a11, 4 + s32i a4, a11, 8 + s32i a5, a11, 12 + s32i a6, a11, 16 + s32i a7, a11, 20 + + movi a8, ffi_closure_SYSV_inner + mov a12, a1 + callx8 a8 # .._inner(*closure, **avalue, *rvalue) + + # load up to four return arguments + l32i a2, a1, 0 + l32i a3, a1, 4 + l32i a4, a1, 8 + l32i a5, a1, 12 + + # (sign-)extend return value + movi a11, FFI_TYPE_UINT8 + bne a10, a11, 1f + extui a2, a2, 0, 8 + retw + +1: movi a11, FFI_TYPE_SINT8 + bne a10, a11, 1f + sext a2, a2, 7 + retw + +1: movi a11, FFI_TYPE_UINT16 + bne a10, a11, 1f + extui a2, a2, 0, 16 + retw + +1: movi a11, FFI_TYPE_SINT16 + bne a10, a11, 1f + sext a2, a2, 15 + +1: retw + +END(ffi_closure_SYSV) |