| /* ********************************************************** |
| * Copyright (c) 2016 ARM Limited. All rights reserved. |
| * **********************************************************/ |
| |
| /* |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of ARM Limited nor the names of its contributors may be |
| * used to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL ARM LIMITED OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| /*************************************************************************** |
| * AArch64-specific assembly and trampoline code, shared with non-core-DR-lib |
| */ |
| |
| #include "../asm_defines.asm" |
| START_FILE |
| |
| #ifdef LINUX |
| #include "include/syscall.h" |
| #endif |
| |
| DECL_EXTERN(unexpected_return) |
| |
| DECLARE_FUNC(dynamorio_syscall) |
| GLOBAL_LABEL(dynamorio_syscall:) |
| #ifdef LINUX |
| /* |
| * ptr_int_t dynamorio_syscall(uint sysnum, uint num_args, ...); |
| * |
| * Linux arm64 system call: |
| * - x8: syscall number |
| * - x0..x6: syscall arguments |
| */ |
| cmp w1, #7 |
| mov x8,x0 |
| mov x0,x2 |
| mov x1,x3 |
| mov x2,x4 |
| mov x3,x5 |
| mov x4,x6 |
| mov x5,x7 |
| /* We set up first 6 args unconditionally, but read 7th arg from stack |
| * only if there are at least 7 args. |
| */ |
| b.cc 1f |
| ldr x6,[sp] |
| 1: |
| svc #0 |
| ret |
| #elif defined(MACOS) |
| /* |
| * x0 = syscall number |
| * x1 = number of arguments |
| * sp+8*n = argument n |
| */ |
| mov x16, x1 |
| ldr x1, [sp] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x2, [sp, #8] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x3, [sp, #16] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x4, [sp, #24] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x5, [sp, #32] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x6, [sp, #40] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x7, [sp, #48] |
| sub x16, x16, 1 |
| cbz x16, do_svc |
| ldr x8, [sp, #56] |
| do_svc: |
| mov x16, #0 |
| svc #0x80 |
| b.cs err_cf |
| ret |
| err_cf: |
| mov x1, x0 |
| mov x0, #-1 |
| ret |
| #endif |
| END_FUNC(dynamorio_syscall) |
| |
| DECLARE_FUNC(dr_fpu_exception_init) |
| GLOBAL_LABEL(dr_fpu_exception_init:) |
| mov x0, #0 |
| msr fpcr, x0 |
| msr fpsr, x0 |
| ret |
| END_FUNC(dr_fpu_exception_init) |
| |
| #ifdef MACOS |
| DECLARE_FUNC(dynamorio_mach_dep_syscall) |
| GLOBAL_LABEL(dynamorio_mach_dep_syscall:) |
| /* TODO i#5383: Use proper gateway. */ |
| brk 0xc001 /* For now we break with a unique code. */ |
| END_FUNC(dynamorio_mach_dep_syscall) |
| |
| DECLARE_FUNC(dynamorio_mach_syscall) |
| GLOBAL_LABEL(dynamorio_mach_syscall:) |
| b _dynamorio_syscall |
| END_FUNC(dynamorio_mach_syscall) |
| #endif |
| |
| #ifdef LINUX |
| /* thread_id_t dynamorio_clone(uint flags, byte *newsp, void *ptid, void *tls, |
| * void *ctid, void (*func)(void)) |
| * TODO i#6514: Add support for passing NULL for newsp. |
| */ |
| DECLARE_FUNC(dynamorio_clone) |
| GLOBAL_LABEL(dynamorio_clone:) |
| stp ARG6, x0, [ARG2, #-16]! /* func is now on TOS of newsp */ |
| /* All args are already in syscall registers. */ |
| mov SYSNUM_REG, #SYS_clone |
| svc #0 |
| cbnz x0, dynamorio_clone_parent |
| ldp x0, x1, [sp], #16 |
| blr x0 |
| bl GLOBAL_REF(unexpected_return) |
| dynamorio_clone_parent: |
| ret |
| END_FUNC(dynamorio_clone) |
| #endif |
| |
| END_FILE |