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Get --ftrace working on aarch64

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This change implements a new approach to function call logging, that's
based on the GCC flag: -fpatchable-function-entry. Read the commentary
in build/config.mk to learn how it works.
This commit is contained in:
Justine Tunney 2023-06-05 23:35:31 -07:00
parent 5b908bc756
commit eb40cb371d
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GPG key ID: BE714B4575D6E328
934 changed files with 2259 additions and 1268 deletions
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26
libc/sysv/macros.internal.h
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@ -19,14 +19,16 @@
.section .text.syscall,"ax",@progbits
#ifdef __x86_64__
.ifnb \kw2
.balign 16
\name: movabs $\amd,%rax
.ftrace1
\name: .ftrace2
movabs $\amd,%rax
jmp *__systemfive(%rip)
.else
\name: push %rbp
.ftrace1
\name: .ftrace2
push %rbp
mov %rsp,%rbp
movabs $\amd,%rax
.hookable
call *__systemfive(%rip)
pop %rbp
ret
@ -36,11 +38,15 @@
.ifc \arm_linux,4095
.ifc \arm_xnu,4095
// return enosys();
\name: b enosys
.ftrace1
\name: .ftrace2
b enosys
.endfn \name,\kw1,\kw2
.else
// return IsXnu() ? syscall(x16, ...) : syscall(x8, ...);
\name: adrp x9,__hostos
.ftrace1
\name: .ftrace2
adrp x9,__hostos
ldr w9,[x9,#:lo12:__hostos]
tbz x9,#3,1f // !IsXnu()
mov x16,#\arm_xnu // apple ordinal
@ -55,7 +61,9 @@
.else
.ifc \arm_xnu,4095
// return IsLinux() ? syscall(x8, ...) : enosys();
\name: adrp x9,__hostos
.ftrace1
\name: .ftrace2
adrp x9,__hostos
ldr w9,[x9,#:lo12:__hostos]
tbz x9,#0,1f // !IsLinux()
mov x8,#\arm_linux // systemd ordinal
@ -66,7 +74,9 @@
1: b enosys
.endfn \name,\kw1,\kw2
.else
\name: mov x16,#\arm_xnu // apple ordinal
.ftrace1
\name: .ftrace2
mov x16,#\arm_xnu // apple ordinal
mov x8,#\arm_linux // systemd ordinal
mov x9,#0 // clear carry flag
adds x9,x9,#0 // clear carry flag