mirror of
https://github.com/jart/cosmopolitan.git
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2fc507c98f
* modelines: tw -> sw shiftwidth, not textwidth. * space-surround modelines * fix irregular modelines * Fix modeline in titlegen.c
130 lines
4.4 KiB
ArmAsm
130 lines
4.4 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 2022 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 "ape/relocations.h"
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#include "libc/dce.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/pc.internal.h"
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.real
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// Start the Cosmopolitan runtime after exiting UEFI Boot Services.
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//
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// @param rdi is mm
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// @param rsi is new pml4t
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// @param rdx is argc
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// @param rcx is argv
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// @see libc/runtime/efimain.greg.c
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_EfiPostboot:
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cli
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// Define handy mnemonics for parameters & constants stored in
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// call-saved registers.
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#define rMm %r12
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#define rArgc %r13
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#define rArgv %r14
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#define rBane %r15
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movabs $BANE,rBane
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mov %rdi,rMm
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mov %rdx,rArgc
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lea (rBane,%rcx),rArgv
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mov $PHYSICAL(.Ltmpstk),%rax // switch to temporary stack
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and $-16,%al // in physical space
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xchg %rax,%rsp
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mov $PHYSICAL(0f),%eax // resume execution in copied
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jmp *%rax // image
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0: mov $EFER,%ecx // enable syscall/sysret & nx
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rdmsr
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or $EFER_SCE|EFER_NXE,%eax
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wrmsr
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mov %rsi,%cr3 // load new page table
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add rBane,%rsp // we can now switch stack to
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add rBane,rMm // negative address space
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mov $1024*1024,%edx // set up virtual memory
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mov $1024*1024+_end,%ecx // mapping
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sub $__executable_start,%ecx
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call __map_phdrs
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mov $1f,%eax // switch rip to virtual
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jmp *%rax // address space
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1: push $0x037f
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fldcw (%rsp)
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.weak _gdtr
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lgdt _gdtr // switch to our own GDT
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mov $GDT_LONG_DATA,%ax
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mov %ax,%ds
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mov %ax,%ss
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mov %ax,%es
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mov %ax,%fs
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mov %ax,%gs
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.weak ape_stack_vaddr
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.weak ape_stack_memsz
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movabs $ape_stack_vaddr,%rsp // switch to final stack in
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add $ape_stack_memsz,%rsp // virtual address space
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movl $0,0x7b000 // unmap null 2mb
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mov rMm,%rdi
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xor %esi,%esi // free up now-unused pages
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xor %edx,%edx
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call __reclaim_boot_pages
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push .Lenv0(%rip) // envp[0][0]
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mov %rsp,%rbp
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push $0 // auxv[1][1]
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push $0 // auxv[1][0]
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mov (rArgv),%rax
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add rBane,%rax
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push %rax // auxv[0][1]
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push $31 // auxv[0][0] AT_EXECFN
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push $0 // envp[1]
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push %rbp // envp[0]
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push $0 // argv[argc] NULL
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lea -8(rArgv,rArgc,8),%rsi // push rest of argv, &
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mov rArgc,%rcx // adjust pointers to point to
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std // negative space
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2: lodsq
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add rBane,%rax
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push %rax
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loop 2b
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cld
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push rArgc // argc
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pushpop _HOSTMETAL,%rcx // sets __hostos in crt.S
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xor %ebp,%ebp
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xor %eax,%eax
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xor %ebx,%ebx
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xor %edx,%edx
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xor %edi,%edi
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xor %esi,%esi
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xor %r8d,%r8d
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xor %r9d,%r9d
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xor %r10d,%r10d
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xor %r11d,%r11d
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xor %r12d,%r12d
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xor %r13d,%r13d
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xor %r14d,%r14d
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xor %r15d,%r15d
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push $GDT_LONG_CODE
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.weak _start
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push $_start
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lretq
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.endfn _EfiPostboot,globl,hidden
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.rodata
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.Lenv0: .asciz "METAL=1"
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.bss
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.space 0x1000
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.Ltmpstk:
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.previous
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.weak __executable_start
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.weak _end
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