sys/amd64/linux/linux_locore.asm

   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 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 .endrtsigcode:
  33 0:      jmp     0b
  34
  35 #if 0
  36         .section .note.Linux, "a",@note
  37         .long 2f - 1f           /* namesz */
  38         .balign 4
  39         .long 4f - 3f           /* descsz */
  40         .long 0
  41 1:
  42         .asciz "Linux"
  43 2:
  44         .balign 4
  45 3:
  46         .long LINUX_VERSION_CODE
  47 4:
  48         .balign 4
  49         .previous
  50 #endif
  51
  52         .section .eh_frame,"a",@progbits
  53 .LSTARTFRAMEDLSI0:
  54         .long .LENDCIEDLSI0-.LSTARTCIEDLSI0
  55 .LSTARTCIEDLSI0:
  56         .long 0                                 /* CIE ID */
  57         .byte 1                                 /* Version number */
  58         .string "zR"                            /* NULL-terminated
  59                                                  * augmentation string
  60                                                  */
  61         .uleb128 1                              /* Code alignment factor */
  62         .sleb128 -4                             /* Data alignment factor */
  63         .byte 8                                 /* Return address register column */
  64         .uleb128 1                              /* Augmentation value length */
  65         .byte 0x1b                              /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
  66         .byte 0x0c                              /* DW_CFA_def_cfa */
  67         .uleb128 4
  68         .uleb128 4
  69         .byte 0x88                              /* DW_CFA_offset, column 0x8 */
  70         .uleb128 1
  71         .align 4
  72 .LENDCIEDLSI0:
  73         .long .LENDFDEDLSI0-.LSTARTFDEDLSI0     /* Length FDE */
  74 .LSTARTFDEDLSI0:
  75         .long .LSTARTFDEDLSI0-.LSTARTFRAMEDLSI0 /* CIE pointer */
  76         .long .startrtsigcode-.                 /* PC-relative start address */
  77         .long .endrtsigcode-.startrtsigcode
  78         .uleb128 0
  79         .align 4
  80 .LENDFDEDLSI0:
  81         .previous