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123 lines
3.4 KiB
ArmAsm
123 lines
3.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│ vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.privileged
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ftrace_hook:
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#ifdef __x86_64__
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// We need to save saved registers because we have some functions
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// like __errno_location which can be called from an inline asm()
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// statement. It's nice to have the flexibility anyway.
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cmpl $0,__ftrace(%rip)
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jle 1f
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push %rbp
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mov %rsp,%rbp
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and $-16,%rsp
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sub $256,%rsp
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push %rax
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push %rbx
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push %rcx
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push %rdx
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push %rdi
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push %rsi
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push %r8
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push %r9
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push %r10
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push %r11
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push %r12
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push %r13
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push %r14
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push %r15
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call __xmm_save
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call ftracer
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call __xmm_load
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pop %r15
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pop %r14
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pop %r13
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pop %r12
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pop %r11
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pop %r10
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pop %r9
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pop %r8
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pop %rsi
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pop %rdi
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pop %rdx
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pop %rcx
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pop %rbx
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pop %rax
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leave
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1: ret
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#elif defined(__aarch64__)
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stp x29,x30,[sp,-384]!
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mov x29,sp
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stp x0,x1,[sp,16]
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adrp x0,__ftrace
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ldr w0,[x0,#:lo12:__ftrace]
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cmp w0,0
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ble 1f
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stp x2,x3,[sp,32]
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stp x4,x5,[sp,48]
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stp x6,x7,[sp,64]
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stp x8,x9,[sp,80]
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stp x10,x11,[sp,96]
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stp x12,x13,[sp,112]
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stp x14,x15,[sp,128]
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stp x16,x19,[sp,160]
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stp x20,x21,[sp,176]
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stp x22,x23,[sp,192]
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stp x24,x25,[sp,208]
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stp x26,x27,[sp,224]
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stp x17,x28,[sp,240]
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stp q0,q1,[sp,256]
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stp q2,q3,[sp,288]
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stp q4,q5,[sp,320]
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stp q6,q7,[sp,352]
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bl ftracer
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ldp q6,q7,[sp,352]
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ldp q4,q5,[sp,320]
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ldp q2,q3,[sp,288]
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ldp q0,q1,[sp,256]
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ldp x17,x28,[sp,240]
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ldp x26,x27,[sp,224]
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ldp x24,x25,[sp,208]
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ldp x22,x23,[sp,192]
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ldp x20,x21,[sp,176]
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ldp x16,x19,[sp,160]
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ldp x14,x15,[sp,128]
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ldp x12,x13,[sp,112]
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ldp x10,x11,[sp,96]
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ldp x8,x9,[sp,80]
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ldp x6,x7,[sp,64]
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ldp x4,x5,[sp,48]
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ldp x2,x3,[sp,32]
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1: ldp x0,x1,[sp,16]
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ldp x29,x30,[sp],384
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ret
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#endif /* __x86_64__ */
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.endfn ftrace_hook,globl,hidden
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