diff options
Diffstat (limited to 'ext/ffi_c/libffi/src/aarch64/sysv.S')
| -rw-r--r-- | ext/ffi_c/libffi/src/aarch64/sysv.S | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/ext/ffi_c/libffi/src/aarch64/sysv.S b/ext/ffi_c/libffi/src/aarch64/sysv.S new file mode 100644 index 0000000..169eab8 --- /dev/null +++ b/ext/ffi_c/libffi/src/aarch64/sysv.S @@ -0,0 +1,333 @@ +/* Copyright (c) 2009, 2010, 2011, 2012 ARM Ltd. + +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> + +#ifdef HAVE_MACHINE_ASM_H +#include <machine/asm.h> +#else +#ifdef __USER_LABEL_PREFIX__ +#define CONCAT1(a, b) CONCAT2(a, b) +#define CONCAT2(a, b) a ## b + +/* Use the right prefix for global labels. */ +#define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x) +#else +#define CNAME(x) x +#endif +#endif + +#define cfi_adjust_cfa_offset(off) .cfi_adjust_cfa_offset off +#define cfi_rel_offset(reg, off) .cfi_rel_offset reg, off +#define cfi_restore(reg) .cfi_restore reg +#define cfi_def_cfa_register(reg) .cfi_def_cfa_register reg + + .text + .globl CNAME(ffi_call_SYSV) +#ifdef __ELF__ + .type CNAME(ffi_call_SYSV), #function +#endif +#ifdef __APPLE__ + .align 2 +#endif + +/* ffi_call_SYSV() + + Create a stack frame, setup an argument context, call the callee + and extract the result. + + The maximum required argument stack size is provided, + ffi_call_SYSV() allocates that stack space then calls the + prepare_fn to populate register context and stack. The + argument passing registers are loaded from the register + context and the callee called, on return the register passing + register are saved back to the context. Our caller will + extract the return value from the final state of the saved + register context. + + Prototype: + + extern unsigned + ffi_call_SYSV (void (*)(struct call_context *context, unsigned char *, + extended_cif *), + struct call_context *context, + extended_cif *, + size_t required_stack_size, + void (*fn)(void)); + + Therefore on entry we have: + + x0 prepare_fn + x1 &context + x2 &ecif + x3 bytes + x4 fn + + This function uses the following stack frame layout: + + == + saved x30(lr) + x29(fp)-> saved x29(fp) + saved x24 + saved x23 + saved x22 + sp' -> saved x21 + ... + sp -> (constructed callee stack arguments) + == + + Voila! */ + +#define ffi_call_SYSV_FS (8 * 4) + + .cfi_startproc +CNAME(ffi_call_SYSV): + stp x29, x30, [sp, #-16]! + cfi_adjust_cfa_offset (16) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) + + mov x29, sp + cfi_def_cfa_register (x29) + sub sp, sp, #ffi_call_SYSV_FS + + stp x21, x22, [sp, #0] + cfi_rel_offset (x21, 0 - ffi_call_SYSV_FS) + cfi_rel_offset (x22, 8 - ffi_call_SYSV_FS) + + stp x23, x24, [sp, #16] + cfi_rel_offset (x23, 16 - ffi_call_SYSV_FS) + cfi_rel_offset (x24, 24 - ffi_call_SYSV_FS) + + mov x21, x1 + mov x22, x2 + mov x24, x4 + + /* Allocate the stack space for the actual arguments, many + arguments will be passed in registers, but we assume + worst case and allocate sufficient stack for ALL of + the arguments. */ + sub sp, sp, x3 + + /* unsigned (*prepare_fn) (struct call_context *context, + unsigned char *stack, extended_cif *ecif); + */ + mov x23, x0 + mov x0, x1 + mov x1, sp + /* x2 already in place */ + blr x23 + + /* Preserve the flags returned. */ + mov x23, x0 + + /* Figure out if we should touch the vector registers. */ + tbz x23, #AARCH64_FFI_WITH_V_BIT, 1f + + /* Load the vector argument passing registers. */ + ldp q0, q1, [x21, #8*32 + 0] + ldp q2, q3, [x21, #8*32 + 32] + ldp q4, q5, [x21, #8*32 + 64] + ldp q6, q7, [x21, #8*32 + 96] +1: + /* Load the core argument passing registers. */ + ldp x0, x1, [x21, #0] + ldp x2, x3, [x21, #16] + ldp x4, x5, [x21, #32] + ldp x6, x7, [x21, #48] + + /* Don't forget x8 which may be holding the address of a return buffer. + */ + ldr x8, [x21, #8*8] + + blr x24 + + /* Save the core argument passing registers. */ + stp x0, x1, [x21, #0] + stp x2, x3, [x21, #16] + stp x4, x5, [x21, #32] + stp x6, x7, [x21, #48] + + /* Note nothing useful ever comes back in x8! */ + + /* Figure out if we should touch the vector registers. */ + tbz x23, #AARCH64_FFI_WITH_V_BIT, 1f + + /* Save the vector argument passing registers. */ + stp q0, q1, [x21, #8*32 + 0] + stp q2, q3, [x21, #8*32 + 32] + stp q4, q5, [x21, #8*32 + 64] + stp q6, q7, [x21, #8*32 + 96] +1: + /* All done, unwind our stack frame. */ + ldp x21, x22, [x29, # - ffi_call_SYSV_FS] + cfi_restore (x21) + cfi_restore (x22) + + ldp x23, x24, [x29, # - ffi_call_SYSV_FS + 16] + cfi_restore (x23) + cfi_restore (x24) + + mov sp, x29 + cfi_def_cfa_register (sp) + + ldp x29, x30, [sp], #16 + cfi_adjust_cfa_offset (-16) + cfi_restore (x29) + cfi_restore (x30) + + ret + + .cfi_endproc +#ifdef __ELF__ + .size CNAME(ffi_call_SYSV), .-CNAME(ffi_call_SYSV) +#endif + +#define ffi_closure_SYSV_FS (8 * 2 + AARCH64_CALL_CONTEXT_SIZE) + +/* ffi_closure_SYSV + + Closure invocation glue. This is the low level code invoked directly by + the closure trampoline to setup and call a closure. + + On entry x17 points to a struct trampoline_data, x16 has been clobbered + all other registers are preserved. + + We allocate a call context and save the argument passing registers, + then invoked the generic C ffi_closure_SYSV_inner() function to do all + the real work, on return we load the result passing registers back from + the call context. + + On entry + + extern void + ffi_closure_SYSV (struct trampoline_data *); + + struct trampoline_data + { + UINT64 *ffi_closure; + UINT64 flags; + }; + + This function uses the following stack frame layout: + + == + saved x30(lr) + x29(fp)-> saved x29(fp) + saved x22 + saved x21 + ... + sp -> call_context + == + + Voila! */ + + .text + .globl CNAME(ffi_closure_SYSV) +#ifdef __APPLE__ + .align 2 +#endif + .cfi_startproc +CNAME(ffi_closure_SYSV): + stp x29, x30, [sp, #-16]! + cfi_adjust_cfa_offset (16) + cfi_rel_offset (x29, 0) + cfi_rel_offset (x30, 8) + + mov x29, sp + cfi_def_cfa_register (x29) + + sub sp, sp, #ffi_closure_SYSV_FS + + stp x21, x22, [x29, #-16] + cfi_rel_offset (x21, -16) + cfi_rel_offset (x22, -8) + + /* Load x21 with &call_context. */ + mov x21, sp + /* Preserve our struct trampoline_data * */ + mov x22, x17 + + /* Save the rest of the argument passing registers. */ + stp x0, x1, [x21, #0] + stp x2, x3, [x21, #16] + stp x4, x5, [x21, #32] + stp x6, x7, [x21, #48] + /* Don't forget we may have been given a result scratch pad address. + */ + str x8, [x21, #64] + + /* Figure out if we should touch the vector registers. */ + ldr x0, [x22, #8] + tbz x0, #AARCH64_FFI_WITH_V_BIT, 1f + + /* Save the argument passing vector registers. */ + stp q0, q1, [x21, #8*32 + 0] + stp q2, q3, [x21, #8*32 + 32] + stp q4, q5, [x21, #8*32 + 64] + stp q6, q7, [x21, #8*32 + 96] +1: + /* Load &ffi_closure.. */ + ldr x0, [x22, #0] + mov x1, x21 + /* Compute the location of the stack at the point that the + trampoline was called. */ + add x2, x29, #16 + + bl CNAME(ffi_closure_SYSV_inner) + + /* Figure out if we should touch the vector registers. */ + ldr x0, [x22, #8] + tbz x0, #AARCH64_FFI_WITH_V_BIT, 1f + + /* Load the result passing vector registers. */ + ldp q0, q1, [x21, #8*32 + 0] + ldp q2, q3, [x21, #8*32 + 32] + ldp q4, q5, [x21, #8*32 + 64] + ldp q6, q7, [x21, #8*32 + 96] +1: + /* Load the result passing core registers. */ + ldp x0, x1, [x21, #0] + ldp x2, x3, [x21, #16] + ldp x4, x5, [x21, #32] + ldp x6, x7, [x21, #48] + /* Note nothing useful is returned in x8. */ + + /* We are done, unwind our frame. */ + ldp x21, x22, [x29, #-16] + cfi_restore (x21) + cfi_restore (x22) + + mov sp, x29 + cfi_def_cfa_register (sp) + + ldp x29, x30, [sp], #16 + cfi_adjust_cfa_offset (-16) + cfi_restore (x29) + cfi_restore (x30) + + ret + .cfi_endproc +#ifdef __ELF__ + .size CNAME(ffi_closure_SYSV), .-CNAME(ffi_closure_SYSV) +#endif |