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Diffstat (limited to 'gcc-4.4.3/libffi/src/cris/sysv.S')
| -rw-r--r-- | gcc-4.4.3/libffi/src/cris/sysv.S | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/gcc-4.4.3/libffi/src/cris/sysv.S b/gcc-4.4.3/libffi/src/cris/sysv.S new file mode 100644 index 000000000..79abaee4d --- /dev/null +++ b/gcc-4.4.3/libffi/src/cris/sysv.S @@ -0,0 +1,215 @@ +/* ----------------------------------------------------------------------- + sysv.S - Copyright (c) 2004 Simon Posnjak + Copyright (c) 2005 Axis Communications AB + + CRIS 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 SIMON POSNJAK 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 <ffi.h> +#define CONCAT(x,y) x ## y +#define XCONCAT(x,y) CONCAT (x, y) +#define L(x) XCONCAT (__USER_LABEL_PREFIX__, x) + + .text + + ;; OK, when we get called we should have this (according to + ;; AXIS ETRAX 100LX Programmer's Manual chapter 6.3). + ;; + ;; R10: ffi_prep_args (func. pointer) + ;; R11: &ecif + ;; R12: cif->bytes + ;; R13: fig->flags + ;; sp+0: ecif.rvalue + ;; sp+4: fn (function pointer to the function that we need to call) + + .globl L(ffi_call_SYSV) + .type L(ffi_call_SYSV),@function + .hidden L(ffi_call_SYSV) + +L(ffi_call_SYSV): + ;; Save the regs to the stack. + push $srp + ;; Used for stack pointer saving. + push $r6 + ;; Used for function address pointer. + push $r7 + ;; Used for stack pointer saving. + push $r8 + ;; We save fig->flags to stack we will need them after we + ;; call The Function. + push $r13 + + ;; Saving current stack pointer. + move.d $sp,$r8 + move.d $sp,$r6 + + ;; Move address of ffi_prep_args to r13. + move.d $r10,$r13 + + ;; Make room on the stack for the args of fn. + sub.d $r12,$sp + + ;; Function void ffi_prep_args(char *stack, extended_cif *ecif) parameters are: + ;; r10 <-- stack pointer + ;; r11 <-- &ecif (already there) + move.d $sp,$r10 + + ;; Call the function. + jsr $r13 + + ;; Save the size of the structures which are passed on stack. + move.d $r10,$r7 + + ;; Move first four args in to r10..r13. + move.d [$sp+0],$r10 + move.d [$sp+4],$r11 + move.d [$sp+8],$r12 + move.d [$sp+12],$r13 + + ;; Adjust the stack and check if any parameters are given on stack. + addq 16,$sp + sub.d $r7,$r6 + cmp.d $sp,$r6 + + bpl go_on + nop + +go_on_no_params_on_stack: + move.d $r6,$sp + +go_on: + ;; Discover if we need to put rval address in to r9. + move.d [$r8+0],$r7 + cmpq FFI_TYPE_STRUCT,$r7 + bne call_now + nop + + ;; Move rval address to $r9. + move.d [$r8+20],$r9 + +call_now: + ;; Move address of The Function in to r7. + move.d [$r8+24],$r7 + + ;; Call The Function. + jsr $r7 + + ;; Reset stack. + move.d $r8,$sp + + ;; Load rval type (fig->flags) in to r13. + pop $r13 + + ;; Detect rval type. + cmpq FFI_TYPE_VOID,$r13 + beq epilogue + + cmpq FFI_TYPE_STRUCT,$r13 + beq epilogue + + cmpq FFI_TYPE_DOUBLE,$r13 + beq return_double_or_longlong + + cmpq FFI_TYPE_UINT64,$r13 + beq return_double_or_longlong + + cmpq FFI_TYPE_SINT64,$r13 + beq return_double_or_longlong + nop + + ;; Just return the 32 bit value. + ba return + nop + +return_double_or_longlong: + ;; Load half of the rval to r10 and the other half to r11. + move.d [$sp+16],$r13 + move.d $r10,[$r13] + addq 4,$r13 + move.d $r11,[$r13] + ba epilogue + nop + +return: + ;; Load the rval to r10. + move.d [$sp+16],$r13 + move.d $r10,[$r13] + +epilogue: + pop $r8 + pop $r7 + pop $r6 + Jump [$sp+] + + .size ffi_call_SYSV,.-ffi_call_SYSV + +/* Save R10..R13 into an array, somewhat like varargs. Copy the next + argument too, to simplify handling of any straddling parameter. + Save R9 and SP after those. Jump to function handling the rest. + Since this is a template, copied and the main function filled in by + the user. */ + + .globl L(ffi_cris_trampoline_template) + .type L(ffi_cris_trampoline_template),@function + .hidden L(ffi_cris_trampoline_template) + +L(ffi_cris_trampoline_template): +0: + /* The value we get for "PC" is right after the prefix instruction, + two bytes from the beginning, i.e. 0b+2. */ + move.d $r10,[$pc+2f-(0b+2)] + move.d $pc,$r10 +1: + addq 2f-1b+4,$r10 + move.d $r11,[$r10+] + move.d $r12,[$r10+] + move.d $r13,[$r10+] + move.d [$sp],$r11 + move.d $r11,[$r10+] + move.d $r9,[$r10+] + move.d $sp,[$r10+] + subq FFI_CRIS_TRAMPOLINE_DATA_PART_SIZE,$r10 + move.d 0,$r11 +3: + jump 0 +2: + .size ffi_cris_trampoline_template,.-0b + +/* This macro create a constant usable as "extern const int \name" in + C from within libffi, when \name has no prefix decoration. */ + + .macro const name,value + .globl \name + .type \name,@object + .hidden \name +\name: + .dword \value + .size \name,4 + .endm + +/* Constants for offsets within the trampoline. We could do this with + just symbols, avoiding memory contents and memory accesses, but the + C usage code would look a bit stranger. */ + + const L(ffi_cris_trampoline_fn_offset),2b-4-0b + const L(ffi_cris_trampoline_closure_offset),3b-4-0b |