134 lines
2.9 KiB
NASM
134 lines
2.9 KiB
NASM
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; ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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; syscall.asm
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; ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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; Forrest Yu, 2005
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; ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%include "sconst.inc"
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; TODO 系统调用的设置
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_NR_get_ticks equ 0 ; 要跟 global.c 中 sys_call_table 的定义相对应！
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_NR_print_str equ 1 ; 要跟 global.c 中 sys_call_table 的定义相对应！
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_NR_ms_delay equ 2 ; 要跟 global.c 中 sys_call_table 的定义相对应！
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_NR_p equ 3 ; 要跟 global.c 中 sys_call_table 的定义相对应！
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_NR_v equ 4 ; 要跟 global.c 中 sys_call_table 的定义相对应！
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INT_VECTOR_SYS_CALL equ 0x90
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; TODO 系统调用的导出符号
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global get_ticks
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global print_str
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global sys_print_str
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global ms_delay ;外部调用，准备现场，发出中断
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global sys_ms_delay ;具体实现，将ebx压入内核栈，调用sys_ms_delay_proc(int)
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global sys_p
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global sys_v
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global p
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global v
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; TODO 导入外部函数
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extern sys_ms_delay_proc
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extern disp_str
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extern sys_p_impl
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extern sys_v_impl
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bits 32
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[section .text]
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; ====================================================================
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; get_ticks
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; ====================================================================
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get_ticks:
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mov eax, _NR_get_ticks
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int INT_VECTOR_SYS_CALL
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ret
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; ====================================================================
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; TODO 不分配时间片sys_ms_delay
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; ====================================================================
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ms_delay:
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;准备现场，发出中断
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mov eax, _NR_ms_delay
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push ebx
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mov ebx, [esp+8]
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int INT_VECTOR_SYS_CALL
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pop ebx
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ret
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sys_ms_delay:
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;系统调用
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pusha
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push ebx
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call sys_ms_delay_proc ;保存ebx后调用sys_ms_delay_proc
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pop ebx
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popa
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ret
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; ====================================================================
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; TODO 打印字符串sys_print_str
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; ====================================================================
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print_str:
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;准备现场，发出中断
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mov eax, _NR_print_str
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push ebx
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mov ebx, [esp+8]
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int INT_VECTOR_SYS_CALL
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pop ebx
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ret
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sys_print_str:
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;系统调用
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pusha
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push ebx
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call disp_str
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pop ebx
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popa
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ret
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; ====================================================================
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; TODO PV
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; ====================================================================
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p:
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;准备现场，发出中断
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mov eax, _NR_p
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push ebx
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mov ebx, [esp+8]
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int INT_VECTOR_SYS_CALL
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pop ebx
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ret
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v:
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;准备现场，发出中断
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mov eax, _NR_v
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push ebx
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mov ebx, [esp+8]
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int INT_VECTOR_SYS_CALL
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pop ebx
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ret
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sys_p:
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;系统调用
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pusha
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push ebx
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call sys_p_impl
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pop ebx
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popa
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ret
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sys_v:
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;系统调用
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pusha
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push ebx
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call sys_v_impl
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pop ebx
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popa
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ret
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