diff options
Diffstat (limited to 'sys/amd64/linux/linux_locore.asm')
| -rw-r--r-- | sys/amd64/linux/linux_locore.asm | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/sys/amd64/linux/linux_locore.asm b/sys/amd64/linux/linux_locore.asm new file mode 100644 index 000000000000..1bcf05bc57dd --- /dev/null +++ b/sys/amd64/linux/linux_locore.asm @@ -0,0 +1,108 @@ +/* $FreeBSD$ */ + +#include "linux_assym.h" /* system definitions */ +#include <machine/asmacros.h> /* miscellaneous asm macros */ + +#include <amd64/linux/linux_syscall.h> /* system call numbers */ + + .data + + .globl linux_platform +linux_platform: + .asciz "x86_64" + + + .text +/* + * To avoid excess stack frame the signal trampoline code emulates + * the 'call' instruction. + */ +NON_GPROF_ENTRY(linux_rt_sigcode) + movq %rsp, %rbx /* preserve sigframe */ + call .getip +.getip: + popq %rax + add $.startrtsigcode-.getip, %rax /* ret address */ + pushq %rax + jmp *LINUX_RT_SIGF_HANDLER(%rbx) +.startrtsigcode: + movq $LINUX_SYS_linux_rt_sigreturn,%rax /* linux_rt_sigreturn() */ + syscall /* enter kernel with args */ + hlt +.endrtsigcode: +0: jmp 0b + +NON_GPROF_ENTRY(__vdso_clock_gettime) + movq $LINUX_SYS_linux_clock_gettime,%rax + syscall + ret +.weak clock_gettime +.set clock_gettime, __vdso_clock_gettime + +NON_GPROF_ENTRY(__vdso_time) + movq $LINUX_SYS_linux_time,%rax + syscall + ret +.weak time +.set time, __vdso_time + +NON_GPROF_ENTRY(__vdso_gettimeofday) + movq $LINUX_SYS_gettimeofday,%rax + syscall + ret +.weak gettimeofday +.set gettimeofday, __vdso_gettimeofday + +NON_GPROF_ENTRY(__vdso_getcpu) + movq $-38,%rax /* not implemented */ + ret +.weak getcpu +.set getcpu, __vdso_getcpu + +#if 0 + .section .note.Linux, "a",@note + .long 2f - 1f /* namesz */ + .balign 4 + .long 4f - 3f /* descsz */ + .long 0 +1: + .asciz "Linux" +2: + .balign 4 +3: + .long LINUX_VERSION_CODE +4: + .balign 4 + .previous +#endif + + .section .eh_frame,"a",@progbits +.LSTARTFRAMEDLSI0: + .long .LENDCIEDLSI0-.LSTARTCIEDLSI0 +.LSTARTCIEDLSI0: + .long 0 /* CIE ID */ + .byte 1 /* Version number */ + .string "zR" /* NULL-terminated + * augmentation string + */ + .uleb128 1 /* Code alignment factor */ + .sleb128 -4 /* Data alignment factor */ + .byte 8 /* Return address register column */ + .uleb128 1 /* Augmentation value length */ + .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ + .byte 0x0c /* DW_CFA_def_cfa */ + .uleb128 4 + .uleb128 4 + .byte 0x88 /* DW_CFA_offset, column 0x8 */ + .uleb128 1 + .align 4 +.LENDCIEDLSI0: + .long .LENDFDEDLSI0-.LSTARTFDEDLSI0 /* Length FDE */ +.LSTARTFDEDLSI0: + .long .LSTARTFDEDLSI0-.LSTARTFRAMEDLSI0 /* CIE pointer */ + .long .startrtsigcode-. /* PC-relative start address */ + .long .endrtsigcode-.startrtsigcode + .uleb128 0 + .align 4 +.LENDFDEDLSI0: + .previous |