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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/relocations.h"
/* clang-format off */
#if __MNO_VZEROUPPER__ + 0
#define vzeroupper
#endif
/ Begins definition of frameless function that calls no functions.
.macro .leafprologue
#if !(defined(TINY) && !defined(__PG__))
push %rbp
mov %rsp,%rbp
#endif
.endm
/ Ends definition of frameless function that calls no functions.
.macro .leafepilogue
#if !(defined(TINY) && !defined(__PG__))
pop %rbp
#endif
ret
.endm
/ Good alignment for functions where alignment actually helps.
/ @note 16-byte
.macro .alignfunc
#ifndef __OPTIMIZE_SIZE__
.p2align 4
#endif
.endm
/ Good alignment for loops where alignment actually helps.
/ @note 16-byte if <10 padding otherwise 8-byte
.macro .alignloop
#ifndef __OPTIMIZE_SIZE__
.p2align 4,,10
.p2align 4
#endif
.endm
/ Loads Effective Address
/ Supporting security blankets
.macro plea symbol:req reg64:req reg32:req
#if __PIC__ + __PIE__ + __code_model_medium__ + __code_model_large__ + 0 > 1
lea \symbol(%rip),\reg64
#else
mov $\symbol,\reg32
#endif
.endm
/ Loads Effective Address to Stack
/ Supporting security blankets
.macro pshaddr symbol:req
#if __PIC__ + __PIE__ + __code_model_medium__ + __code_model_large__ + 0 > 1
push $IMAGE_BASE_VIRTUAL+RVA(\symbol)(%rip),\reg64
#else
push $\symbol
#endif
.endm
/ TODO(jart): delete
/ Loads Effective Address
/ Supporting security blankets
.macro ezlea symbol:req reg:req
#if __pic__ + __pie__ + __code_model_medium__ + __code_model_large__ + 0 > 1
/ lea \symbol(%rip),%r\reg
mov $\symbol,%e\reg
#else
mov $\symbol,%e\reg
#endif
.endm
.macro farcall symbol:req
.type \symbol,@function
#if __PIC__ + __PIE__ + __code_model_medium__ + __code_model_large__ + 0 > 1
call *\symbol\()@gotpcrel(%rip)
#else
call \symbol\()@plt
#endif
.endm
/ Creates first stack frame.
.macro .frame0
and $-16,%rsp
xor %ebp,%ebp
.endm
.macro .source symbol:req
.endm
/ Inserts profiling hook in prologue if cc wants it.
/
/ Cosmopolitan does this in a slightly different way from normal
/ GNU toolchains. We always use the -mnop-mcount behavior, since
/ the runtime is able to morph the binary at runtime. It is good
/ since we can put hooks for profiling and function tracing into
/ most builds, without any impact on performance.
/
/ @cost 0.3 cycles, 5 bytes
/ @see build/compile
.macro .profilable
#ifdef __PG__
1382:
#if defined(__MFENTRY__)
call __fentry__
#elif defined(__PIC__) || defined(__PIE__)
/ nopw 0x00(%rax,%rax,1)
.byte 0x66,0x0f,0x1f,0x44,0x00,0x00
#else
/ nopl 0x00(%rax,%rax,1)
.byte 0x0f,0x1f,0x44,0x00,0x00
#endif
#if defined(__MRECORD_MCOUNT__) && !defined(__MFENTRY__)
.pushsection __mcount_loc,"a",@progbits
.quad 1382b
.popsection
#endif
#endif
.endm
/ Pushes RVA on stack of linktime mergeable string literal.
/ @see popstr
.macro pushstr text
.pushsection .rodata.str1.1,"aSM",@progbits,1
.Lstr\@: .asciz "\text"
.endobj .Lstr\@
.popsection
push $.Lstr\@ - IMAGE_BASE_VIRTUAL
.endm
/ Pops off stack string address.
/ @see pushstr
.macro popstr dest:req
addl $IMAGE_BASE_VIRTUAL,(%rsp)
pop \dest
.endm
/ Loads address of linktime mergeable string literal into register.
.macro getstr text:req reg64:req reg32 regsz64 regsz32 bias=0
.pushsection .rodata.str1.1,"aSM",@progbits,1
.type .Lstr\@,@object
.Lstr\@: .asciz "\text"
.Lstr\@.size = .-.Lstr\@ - 1
.size .Lstr\@,.-.Lstr\@
.popsection
plea .Lstr\@,\reg64,\reg32
.ifnb \regsz64
#ifdef __OPTIMIZE_SIZE__
.if .Lstr\@.size + \bias < 128
pushpop .Lstr\@.size,\regsz64
.else
mov $.Lstr\@.size,\regsz32
.endif
#else
mov $.Lstr\@.size,\regsz32
#endif
.endif
.endm
/ TODO(jart): delete
/ Loads address of linktime mergeable string literal into register.
.macro loadstr text:req reg:req regsz bias=0
.pushsection .rodata.str1.1,"aSM",@progbits,1
.type .Lstr\@,@object
.Lstr\@: .asciz "\text"
.Lstr\@.size = .-.Lstr\@ - 1
.size .Lstr\@,.-.Lstr\@
.popsection
ezlea .Lstr\@,\reg
.ifnb \regsz
#ifdef __OPTIMIZE_SIZE__
.if .Lstr\@.size + \bias < 128
pushpop .Lstr\@.size,%r\regsz
.else
mov $.Lstr\@.size,%e\regsz
.endif
#else
mov $.Lstr\@.size,%e\regsz
#endif
.endif
.endm