mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
189 lines
4.9 KiB
ArmAsm
189 lines
4.9 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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.internal.h"
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#include "libc/notice.inc"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/dce.h"
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.text.startup
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// Cosmopolitan runtime.
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//
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// @param edi is argc
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// @param rsi is argv
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// @param rdx is environ
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// @param rcx is auxv
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// @noreturn
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cosmo: push %rbp
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mov %rsp,%rbp
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mov %edi,%r12d
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mov %rsi,%r13
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mov %rdx,%r14
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mov %rcx,%r15
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#ifdef SYSDEBUG
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call __strace_init
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mov %eax,%r12d
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#endif /* SYSDEBUG */
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#ifdef __FAST_MATH__
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push %rax
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stmxcsr (%rsp)
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orl $0x8040,(%rsp)
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ldmxcsr (%rsp)
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pop %rax
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#endif
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// run assembly init
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call _init
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// call constructors
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ezlea __init_array_start,ax # static ctors in forward order
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.weak __init_array_start # could be called multiple times
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ezlea __init_array_end,cx # idempotency recommended
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.weak __init_array_end # @see ape/ape.lds
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1: cmp %rax,%rcx
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je 2f
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push %rax
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push %rcx
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call .Largs
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call *(%rax)
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pop %rcx
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pop %rax
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add $8,%rax
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jmp 1b
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// call main()
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2: call .Largs
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.weak main
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call main
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xchg %eax,%edi
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call exit
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.Largs: mov %r12d,%edi
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mov %r13,%rsi
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mov %r14,%rdx
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mov %r15,%rcx
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ret
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.endfn cosmo,weak
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// Enables Thread Local Storage.
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.init.start 304,_init_tls
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push %rdi
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push %rsi
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call __enable_tls
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pop %rsi
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pop %rdi
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.init.end 304,_init_tls
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#if !IsTiny()
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// Creates deterministically addressed stack we can use
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//
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// This helps debugging be more comprehensible, because
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// when diagnosing low-level problems when error report
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// isn't working, sometimes numbers are all you have to
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// go on, and we can't use them if kernel hardening has
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// configured that meaningful data to be randomized.
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//
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// Having deterministic addresses is also key to ensure
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// builds, execution, and other things are reproducible
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.init.start 304,_init_stack
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testb IsWindows()
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jnz 9f
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testb IsMetal()
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jnz 9f
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push %rdi
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push %rsi
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// allocate stack
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movabs $ape_stack_vaddr,%rdi
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mov $ape_stack_memsz,%esi
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mov $ape_stack_prot,%edx
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mov $MAP_STACK,%ecx
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or MAP_ANONYMOUS,%ecx
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or $-1,%r8
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xor %r9d,%r9d
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push %rsi
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call mmap
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pop %r8
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pop %rsi
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pop %rdi
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cmp $-1,%rax
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je 9f
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// switch stacks
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//
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// we subtract 8 because the openbsd kernel always checks rsp
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// is on a MAP_STACK interval non-inclusively of stack + size
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leave
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pop %rcx # return address
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sub $8,%r8d # openbsd:stackbound
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lea (%rax,%r8),%rsp
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mov $ape_stack_align,%eax
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neg %rax
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and %rax,%rsp
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push %rcx
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push %rbp
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mov %rsp,%rbp
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9: nop
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.init.end 304,_init_stack
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.weak ape_stack_prot
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.weak ape_stack_vaddr
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.weak ape_stack_memsz
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.weak ape_stack_align
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#endif
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#if IsAsan()
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.init.start 305,_init_symbols
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push %rdi
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push %rsi
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call __init_symbols
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pop %rsi
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pop %rdi
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.init.end 305,_init_symbols
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#endif
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#ifdef __PG__
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.init.start 306,_init_ftrace
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push %rdi
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push %rsi
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call ftrace_init
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mov %eax,%r12d
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pop %rsi
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pop %rdi
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.init.end 306,_init_ftrace
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#endif
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#if IsModeDbg()
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#ifdef SYSDEBUG
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.init.start 307,_init_printargs
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cmpl $0,__strace(%rip)
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jz 1f
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push %rdi
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push %rsi
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loadstr STRACE_PROLOGUE,di
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call __printargs
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pop %rsi
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pop %rdi
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1: .init.end 307,_init_printargs
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#endif
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#endif
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