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
150 lines
3.7 KiB
NASM
150 lines
3.7 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 <i386/linux/linux_syscall.h> /* system call numbers */
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#include "assym.inc"
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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_sigcode)
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movl %esp, %ebx /* preserve sigframe */
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call .getip0
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.getip0:
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popl %eax
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add $.startsigcode-.getip0, %eax /* ret address */
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push %eax
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jmp *LINUX_SIGF_HANDLER(%ebx)
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.startsigcode:
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popl %eax /* gcc unwind code need this */
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movl $LINUX_SYS_linux_sigreturn,%eax /* linux_sigreturn() */
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int $0x80 /* enter kernel with args */
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.endsigcode:
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0: jmp 0b
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NON_GPROF_ENTRY(linux_rt_sigcode)
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leal LINUX_RT_SIGF_UC(%esp),%ebx /* linux ucp */
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leal LINUX_RT_SIGF_SC(%ebx),%ecx /* linux sigcontext */
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movl %esp, %edi
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call .getip1
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.getip1:
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popl %eax
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add $.startrtsigcode-.getip1, %eax /* ret address */
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push %eax
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jmp *LINUX_RT_SIGF_HANDLER(%edi)
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.startrtsigcode:
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movl $LINUX_SYS_linux_rt_sigreturn,%eax /* linux_rt_sigreturn() */
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int $0x80 /* enter kernel with args */
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.endrtsigcode:
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0: jmp 0b
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NON_GPROF_ENTRY(linux_vsyscall)
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.startvsyscall:
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int $0x80
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ret
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.endvsyscall:
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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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#define do_cfa_expr(offset) \
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.byte 0x0f; /* DW_CFA_def_cfa_expression */ \
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.uleb128 11f-10f; /* length */ \
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10: .byte 0x74; /* DW_OP_breg4 */ \
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.sleb128 offset; /* offset */ \
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.byte 0x06; /* DW_OP_deref */ \
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11:
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/* CIE */
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.section .eh_frame,"a",@progbits
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.LSTARTFRAMEDLSI1:
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.long .LENDCIEDLSI1-.LSTARTCIEDLSI1
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.LSTARTCIEDLSI1:
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.long 0 /* CIE ID */
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.byte 1 /* Version number */
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.string "zRS" /* 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
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* register column
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*/
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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 0 /* DW_CFA_nop */
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.align 4
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.LENDCIEDLSI1:
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/* FDE */
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.long .LENDFDEDLSI1-.LSTARTFDEDLSI1 /* Length FDE */
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.LSTARTFDEDLSI1:
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.long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
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.long .startsigcode-. /* PC-relative start address */
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.long .endsigcode-.startsigcode
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.uleb128 0 /* Augmentation */
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do_cfa_expr(LINUX_SIGF_SC-8)
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.align 4
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.LENDFDEDLSI1:
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.long .LENDFDEDLSI2-.LSTARTFDEDLSI2 /* Length FDE */
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.LSTARTFDEDLSI2:
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.long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* 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 /* Augmentation */
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do_cfa_expr(LINUX_RT_SIGF_SC-4+LINUX_SC_ESP)
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.align 4
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.LENDFDEDLSI2:
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.previous
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.section .eh_frame,"a",@progbits
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.LSTARTFRAMEDLSI2:
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.long .LENDCIEDLSI2-.LSTARTCIEDLSI2
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.LSTARTCIEDLSI2:
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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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.LENDCIEDLSI2:
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.long .LENDFDEDLSI3-.LSTARTFDEDLSI3 /* Length FDE */
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.LSTARTFDEDLSI3:
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.long .LSTARTFDEDLSI3-.LSTARTFRAMEDLSI2 /* CIE pointer */
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.long .startvsyscall-. /* PC-relative start address */
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.long .endvsyscall-.startvsyscall
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.uleb128 0
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.align 4
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.LENDFDEDLSI3:
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.previous
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