305b9efefc
It is assembled using "${CC} -x assembler-with-cpp", which by convention
(bsd.suffixes.mk) uses the .asm extension.
This is a portion of the review referenced below (D18344). That review
also renamed linux_support.s to .S, but that is a functional change
(using the compiler's integrated assembler instead of as) and will be
revisited separately.
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D18344
109 lines
2.3 KiB
NASM
109 lines
2.3 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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NON_GPROF_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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NON_GPROF_ENTRY(__vdso_clock_gettime)
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movq $LINUX_SYS_linux_clock_gettime,%rax
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syscall
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ret
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.weak clock_gettime
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.set clock_gettime, __vdso_clock_gettime
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NON_GPROF_ENTRY(__vdso_time)
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movq $LINUX_SYS_linux_time,%rax
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syscall
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ret
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.weak time
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.set time, __vdso_time
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NON_GPROF_ENTRY(__vdso_gettimeofday)
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movq $LINUX_SYS_gettimeofday,%rax
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syscall
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ret
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.weak gettimeofday
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.set gettimeofday, __vdso_gettimeofday
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NON_GPROF_ENTRY(__vdso_getcpu)
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movq $-38,%rax /* not implemented */
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ret
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.weak getcpu
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.set getcpu, __vdso_getcpu
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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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