815165be20
In preparation for vDSO code revision get rid of incomplete vDSO methods from locore, but leave .note.Linux section commented out. .note.Linux section is used by glibc rtld to get the kernel version, that saves one system call call. I'll try to implement it later, if figure out how to use it with jails. MFC after: 2 weeks
83 lines
1.8 KiB
NASM
83 lines
1.8 KiB
NASM
/* $FreeBSD$ */
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#include "linux_assym.h" /* system definitions */
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#include <machine/asmacros.h> /* miscellaneous asm macros */
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#include <amd64/linux/linux_syscall.h> /* system call numbers */
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.data
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.globl linux_platform
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linux_platform:
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.asciz "x86_64"
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.text
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/*
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* To avoid excess stack frame the signal trampoline code emulates
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* the 'call' instruction.
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*/
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ENTRY(linux_rt_sigcode)
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movq %rsp, %rbx /* preserve sigframe */
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call .getip
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.getip:
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popq %rax
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add $.startrtsigcode-.getip, %rax /* ret address */
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pushq %rax
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jmp *LINUX_RT_SIGF_HANDLER(%rbx)
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.startrtsigcode:
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movq $LINUX_SYS_linux_rt_sigreturn,%rax /* linux_rt_sigreturn() */
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syscall /* enter kernel with args */
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hlt
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.endrtsigcode:
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0: jmp 0b
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#if 0
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.section .note.Linux, "a",@note
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.long 2f - 1f /* namesz */
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.balign 4
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.long 4f - 3f /* descsz */
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.long 0
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1:
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.asciz "Linux"
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2:
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.balign 4
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3:
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.long LINUX_VERSION_CODE
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4:
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.balign 4
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.previous
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#endif
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.section .eh_frame,"a",@progbits
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.LSTARTFRAMEDLSI0:
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.long .LENDCIEDLSI0-.LSTARTCIEDLSI0
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.LSTARTCIEDLSI0:
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.long 0 /* CIE ID */
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.byte 1 /* Version number */
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.string "zR" /* NULL-terminated
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* augmentation string
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*/
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.uleb128 1 /* Code alignment factor */
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.sleb128 -4 /* Data alignment factor */
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.byte 8 /* Return address register column */
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.uleb128 1 /* Augmentation value length */
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.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
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.byte 0x0c /* DW_CFA_def_cfa */
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.uleb128 4
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.uleb128 4
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.byte 0x88 /* DW_CFA_offset, column 0x8 */
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.uleb128 1
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.align 4
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.LENDCIEDLSI0:
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.long .LENDFDEDLSI0-.LSTARTFDEDLSI0 /* Length FDE */
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.LSTARTFDEDLSI0:
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.long .LSTARTFDEDLSI0-.LSTARTFRAMEDLSI0 /* CIE pointer */
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.long .startrtsigcode-. /* PC-relative start address */
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.long .endrtsigcode-.startrtsigcode
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.uleb128 0
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.align 4
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.LENDFDEDLSI0:
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.previous
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