sys/amd64/linux/linux_locore.s

   1 /* $FreeBSD$ */
   2
   3 #include "linux_assym.h"                        /* system definitions */
   4 #include <machine/asmacros.h>                   /* miscellaneous asm macros */
   5
   6 #include <amd64/linux/linux_syscall.h>          /* system call numbers */
   7
   8         .data
   9
  10         .globl linux_platform
  11 linux_platform:
  12         .asciz "x86_64"
  13
  14
  15         .text
  16 /*
  17  * To avoid excess stack frame the signal trampoline code emulates
  18  * the 'call' instruction.
  19  */
  20 NON_GPROF_ENTRY(linux_rt_sigcode)
  21         movq    %rsp, %rbx                      /* preserve sigframe */
  22         call    .getip
  23 .getip:
  24         popq    %rax
  25         add     $.startrtsigcode-.getip, %rax   /* ret address */
  26         pushq   %rax
  27         jmp     *LINUX_RT_SIGF_HANDLER(%rbx)
  28 .startrtsigcode:
  29         movq    $LINUX_SYS_linux_rt_sigreturn,%rax   /* linux_rt_sigreturn() */
  30         syscall                                 /* enter kernel with args */
  31         hlt
  32 0:      jmp     0b
  33
  34 NON_GPROF_ENTRY(__vdso_clock_gettime)
  35         movq    $LINUX_SYS_linux_clock_gettime,%rax
  36         syscall
  37         ret
  38 .weak clock_gettime
  39 .set clock_gettime, __vdso_clock_gettime
  40
  41 NON_GPROF_ENTRY(__vdso_time)
  42         movq    $LINUX_SYS_linux_time,%rax
  43         syscall
  44         ret
  45 .weak time
  46 .set time, __vdso_time
  47
  48 NON_GPROF_ENTRY(__vdso_gettimeofday)
  49         movq    $LINUX_SYS_gettimeofday,%rax
  50         syscall
  51         ret
  52 .weak gettimeofday
  53 .set gettimeofday, __vdso_gettimeofday
  54
  55 NON_GPROF_ENTRY(__vdso_getcpu)
  56         movq    $-38,%rax       /* not implemented */
  57         ret
  58 .weak getcpu
  59 .set getcpu, __vdso_getcpu
  60
  61 #if 0
  62         .section .note.Linux, "a",@note
  63         .long 2f - 1f           /* namesz */
  64         .balign 4
  65         .long 4f - 3f           /* descsz */
  66         .long 0
  67 1:
  68         .asciz "Linux"
  69 2:
  70         .balign 4
  71 3:
  72         .long LINUX_VERSION_CODE
  73 4:
  74         .balign 4
  75         .previous
  76 #endif