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You can now say `gdb hello.com.dbg` and it'll work perfectly.
177 lines
4.9 KiB
ArmAsm
177 lines
4.9 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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// save argument registers
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// we save %rax because __gc() takes it as an argument.
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// we save %r10 because it's used as a syscall argument.
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cmpl $0,__ftrace(%rip)
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jle 1f
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.cfi_startproc
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push %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset %rbp, -16
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mov %rsp,%rbp
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.cfi_def_cfa_register %rbp
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and $-16,%rsp
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sub $128,%rsp
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movdqu %xmm0,-0x80(%rbp)
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movdqu %xmm1,-0x70(%rbp)
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movdqu %xmm2,-0x60(%rbp)
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movdqu %xmm3,-0x50(%rbp)
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movdqu %xmm4,-0x40(%rbp)
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movdqu %xmm5,-0x30(%rbp)
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movdqu %xmm6,-0x20(%rbp)
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movdqu %xmm7,-0x10(%rbp)
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push %rax
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.cfi_offset %rax, -24
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push %rcx
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.cfi_offset %rcx, -32
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push %rdx
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.cfi_offset %rdx, -40
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push %rdi
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.cfi_offset %rdi, -48
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push %rsi
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.cfi_offset %rsi, -56
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push %r8
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.cfi_offset %r8, -64
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push %r9
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.cfi_offset %r9, -72
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push %r10
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.cfi_offset %r10, -80
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call ftracer
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movdqu -0x80(%rbp),%xmm0
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movdqu -0x70(%rbp),%xmm1
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movdqu -0x60(%rbp),%xmm2
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movdqu -0x50(%rbp),%xmm3
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movdqu -0x40(%rbp),%xmm4
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movdqu -0x30(%rbp),%xmm5
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movdqu -0x20(%rbp),%xmm6
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movdqu -0x10(%rbp),%xmm7
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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 %rax
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leave
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.cfi_restore %rbp
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.cfi_def_cfa %rsp, 8
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1: ret
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.cfi_endproc
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#elif defined(__aarch64__)
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stp x29,x30,[sp,-384]!
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.cfi_startproc
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.cfi_def_cfa_offset 384
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.cfi_offset 29, -384 // x29 (fp) is saved at [sp - 384]
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.cfi_offset 30, -376 // x30 (lr) is saved at [sp - 376]
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mov x29,sp
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.cfi_def_cfa_register 29
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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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.cfi_offset 2, -352
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.cfi_offset 3, -344
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stp x4,x5,[sp,48]
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.cfi_offset 4, -336
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.cfi_offset 5, -328
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stp x6,x7,[sp,64]
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.cfi_offset 6, -320
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.cfi_offset 7, -312
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stp x8,x9,[sp,80]
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.cfi_offset 8, -304
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.cfi_offset 9, -296
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stp x10,x11,[sp,96]
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.cfi_offset 10, -288
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.cfi_offset 11, -280
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stp x12,x13,[sp,112]
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.cfi_offset 12, -272
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.cfi_offset 13, -264
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stp x14,x15,[sp,128]
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.cfi_offset 14, -256
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.cfi_offset 15, -248
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stp x16,x19,[sp,160]
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.cfi_offset 16, -224
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.cfi_offset 19, -216
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stp x20,x21,[sp,176]
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.cfi_offset 20, -208
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.cfi_offset 21, -200
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stp x22,x23,[sp,192]
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.cfi_offset 22, -192
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.cfi_offset 23, -184
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stp x24,x25,[sp,208]
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.cfi_offset 24, -176
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.cfi_offset 25, -168
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stp x26,x27,[sp,224]
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.cfi_offset 26, -160
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.cfi_offset 27, -152
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stp x17,x28,[sp,240]
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.cfi_offset 17, -144
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.cfi_offset 28, -136
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// No CFI directives needed for FP registers
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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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.cfi_restore 29
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.cfi_restore 30
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.cfi_def_cfa 7, 0 // On some ARM systems the stack pointer is represented by register 7
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.cfi_def_cfa_offset 0
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ret
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.cfi_endproc
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#endif /* __x86_64__ */
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.endfn ftrace_hook,globl,hidden
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