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- #include "mem.h"
- #include "amd64.h"
- .code64
- /*
- */
- .globl touser
- touser:
- CLI
- SWAPGS
- MOVQ $SSEL(SiUDS, SsRPL3), %rax
- MOVW %ax, %DS
- MOVW %ax, %ES
- MOVW %ax, %FS
- MOVW %ax, %GS
- MOVQ $(UTZERO+0x28), %rcx /* ip */
- MOVQ $If, %r11 /* flags */
- MOVQ %rdi, %rsp /* sp */
- .byte 0x48; SYSRET /* SYSRETQ */
- /*
- */
- .globl syscallentry
- syscallentry:
- SWAPGS
- .byte 0x65; MOVQ 0, %r15 /* m-> (MOVQ GS:0x0, R15) */
- MOVQ 16(%r15),%r14 /* m->proc */
- MOVQ %rsp, %r13
- MOVQ 16(RUSER), %rsp /* m->proc->kstack */
- ADDQ $KSTACK, %rsp
- PUSHQ $SSEL(SiUDS, SsRPL3) /* old stack segment */
- PUSHQ %r13 /* old sp */
- PUSHQ %r11 /* old flags */
- PUSHQ $SSEL(SiUCS, SsRPL3) /* old code segment */
- PUSHQ %rcx /* old ip */
- SUBQ $(18*8), %rsp /* unsaved registers */
- MOVW $SSEL(SiUDS, SsRPL3), (15*8+0)(%rsp)
- MOVW %ES, (15*8+2)(%rsp)
- MOVW %FS, (15*8+4)(%rsp)
- MOVW %GS, (15*8+6)(%rsp)
- PUSHQ %rsp /* Ureg* */
- PUSHQ %rdi /* system call number */
- CALL syscall
- .globl syscallreturn
- syscallreturn:
- MOVQ 16(%rsp), AX /* Ureg.ax */
- MOVQ (16+6*8)(%rsp), BP /* Ureg.bp */
- _syscallreturn:
- ADDQ $(17*8), %rsp /* registers + arguments */
- CLI
- SWAPGS
- MOVW 0(%rsp), %DS
- MOVW 2(%rsp), %ES
- MOVW 4(%rsp), %FS
- MOVW 6(%rsp), %GS
- MOVQ 24(%rsp), %rcx /* ip */
- MOVQ 40(%rsp), %r11 /* flags */
- MOVQ 48(%rsp), %rsp /* sp */
- .byte 0x48; SYSRET /* SYSRETQ */
- .globl sysrforkret
- sysrforkret:
- // DEBUG
- cli
- 1: jmp 1b
- MOVQ $0, %rax
- JMP _syscallreturn
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