sys/amd64/linux32/linux32_locore.s

   1 /* $FreeBSD$ */
   2
   3 #include "linux32_assym.h"                      /* system definitions */
   4 #include <machine/asmacros.h>                   /* miscellaneous asm macros */
   5
   6 #include <amd64/linux32/linux32_syscall.h>      /* system call numbers */
   7
   8 .data
   9
  10         .globl linux_platform
  11 linux_platform:
  12         .asciz "i686"
  13
  14 .text
  15 .code32
  16
  17 /*
  18  * To avoid excess stack frame the signal trampoline code emulates
  19  * the 'call' instruction.
  20  */
  21 NON_GPROF_ENTRY(linux32_sigcode)
  22         movl    %esp, %ebx                      /* preserve sigframe */
  23         call .getip0
  24 .getip0:
  25         popl    %eax
  26         add     $.startsigcode-.getip0, %eax    /* ret address */
  27         push    %eax
  28         jmp     *LINUX_SIGF_HANDLER(%ebx)
  29 .startsigcode:
  30         popl    %eax
  31         movl    $LINUX32_SYS_linux_sigreturn,%eax       /* linux_sigreturn() */
  32         int     $0x80                           /* enter kernel with args */
  33 .endsigcode:
  34 0:      jmp     0b
  35
  36 NON_GPROF_ENTRY(linux32_rt_sigcode)
  37         leal    LINUX_RT_SIGF_UC(%esp),%ebx     /* linux ucp */
  38         leal    LINUX_RT_SIGF_SC(%ebx),%ecx     /* linux sigcontext */
  39         movl    %esp, %edi
  40         call    .getip1
  41 .getip1:
  42         popl    %eax
  43         add     $.startrtsigcode-.getip1, %eax  /* ret address */
  44         push    %eax
  45         jmp     *LINUX_RT_SIGF_HANDLER(%edi)
  46 .startrtsigcode:
  47         movl    $LINUX32_SYS_linux_rt_sigreturn,%eax   /* linux_rt_sigreturn() */
  48         int     $0x80                           /* enter kernel with args */
  49 .endrtsigcode:
  50 0:      jmp     0b
  51
  52 NON_GPROF_ENTRY(linux32_vsyscall)
  53 .startvsyscall:
  54         int $0x80
  55         ret
  56 .endvsyscall:
  57
  58 #if 0
  59         .section .note.Linux, "a",@note
  60         .long 2f - 1f           /* namesz */
  61         .balign 4
  62         .long 4f - 3f           /* descsz */
  63         .long 0
  64 1:
  65         .asciz "Linux"
  66 2:
  67         .balign 4
  68 3:
  69         .long LINUX_VERSION_CODE
  70 4:
  71         .balign 4
  72         .previous
  73 #endif
  74
  75 #define do_cfa_expr(offset)                                             \
  76         .byte 0x0f;                     /* DW_CFA_def_cfa_expression */ \
  77         .uleb128 11f-10f;               /*   length */                  \
  78 10:     .byte 0x74;                     /*     DW_OP_breg4 */           \
  79         .sleb128 offset;                /*      offset */               \
  80         .byte 0x06;                     /*     DW_OP_deref */           \
  81 11:
  82
  83
  84         /* CIE */
  85         .section .eh_frame,"a",@progbits
  86 .LSTARTFRAMEDLSI1:
  87         .long .LENDCIEDLSI1-.LSTARTCIEDLSI1
  88 .LSTARTCIEDLSI1:
  89         .long 0                                 /* CIE ID */
  90         .byte 1                                 /* Version number */
  91         .string "zRS"                           /* NULL-terminated
  92                                                  * augmentation string
  93                                                  */
  94         .uleb128 1                              /* Code alignment factor */
  95         .sleb128 -4                             /* Data alignment factor */
  96         .byte 8                                 /* Return address
  97                                                  * register column
  98                                                  */
  99         .uleb128 1                              /* Augmentation value length */
 100         .byte 0x1b                              /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
 101         .byte 0                                 /* DW_CFA_nop */
 102         .align 4
 103 .LENDCIEDLSI1:
 104
 105         /* FDE */
 106         .long .LENDFDEDLSI1-.LSTARTFDEDLSI1     /* Length FDE */
 107 .LSTARTFDEDLSI1:
 108         .long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
 109         .long .startsigcode-.                   /* PC-relative start address */
 110         .long .endsigcode-.startsigcode
 111         .uleb128 0                              /* Augmentation */
 112         do_cfa_expr(LINUX_SIGF_SC-8)
 113         .align 4
 114 .LENDFDEDLSI1:
 115
 116         .long .LENDFDEDLSI2-.LSTARTFDEDLSI2     /* Length FDE */
 117 .LSTARTFDEDLSI2:
 118         .long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* CIE pointer */
 119         .long .startrtsigcode-.                 /* PC-relative start address */
 120         .long .endrtsigcode-.startrtsigcode
 121         .uleb128 0                              /* Augmentation */
 122         do_cfa_expr(LINUX_RT_SIGF_SC-4+LINUX_SC_ESP)
 123         .align 4
 124 .LENDFDEDLSI2:
 125         .previous
 126
 127         .section .eh_frame,"a",@progbits
 128 .LSTARTFRAMEDLSI2:
 129         .long .LENDCIEDLSI2-.LSTARTCIEDLSI2
 130 .LSTARTCIEDLSI2:
 131         .long 0                                 /* CIE ID */
 132         .byte 1                                 /* Version number */
 133         .string "zR"                            /* NULL-terminated
 134                                                  * augmentation string
 135                                                  */
 136         .uleb128 1                              /* Code alignment factor */
 137         .sleb128 -4                             /* Data alignment factor */
 138         .byte 8                                 /* Return address register column */
 139         .uleb128 1                              /* Augmentation value length */
 140         .byte 0x1b                              /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
 141         .byte 0x0c                              /* DW_CFA_def_cfa */
 142         .uleb128 4
 143         .uleb128 4
 144         .byte 0x88                              /* DW_CFA_offset, column 0x8 */
 145         .uleb128 1
 146         .align 4
 147 .LENDCIEDLSI2:
 148         .long .LENDFDEDLSI3-.LSTARTFDEDLSI3 /* Length FDE */
 149 .LSTARTFDEDLSI3:
 150         .long .LSTARTFDEDLSI3-.LSTARTFRAMEDLSI2 /* CIE pointer */
 151         .long .startvsyscall-.                  /* PC-relative start address */
 152         .long .endvsyscall-.startvsyscall
 153         .uleb128 0
 154         .align 4
 155 .LENDFDEDLSI3:
 156         .previous