The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux32_locore.s

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    1 /* $FreeBSD: releng/12.0/sys/amd64/linux32/linux32_locore.s 328890 2018-02-05 17:29:12Z emaste $ */
    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

Cache object: 6aa1cd0163554ae76f4bba88adf38dcd


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