997 lines
14 KiB
Plaintext
997 lines
14 KiB
Plaintext
# 1 "hello.k"
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# 1 "<built-in>"
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# 1 "<command-line>"
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# 31 "<command-line>"
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# 1 "/usr/include/stdc-predef.h" 1 3 4
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# 32 "<command-line>" 2
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# 1 "hello.k"
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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start:
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jmp main
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# 1 "crt/crt.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; Limits
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;
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# 31 "crt/crt.k"
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;
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; Magic numbers
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;
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;
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; CRT librairies
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;
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# 1 "./crt/sys.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; SHUTDOWN syscall
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;
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; End virtual machine
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;
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Sys.Shutdown := 0x00
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;
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; EXIT syscall
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;
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; Return to COMMAND.COM
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;
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Sys.Exit := 0x01
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;
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; EXEC syscall
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;
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; IN
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; ax0 = new RIP to load
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; ax1 = frame ID to switch to
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;
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; New frame ID must be higher than current
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; frame ID, and cannot be below 5
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;
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; New CR1 is set so that new RIP corresponds to 1MB
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;
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Sys.ExecuteInFrame := 0x02
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; FIND syscalls
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;
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; Find file on disk
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;
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; IN
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; ax0 = address of name buffer
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; ax1 = size of name buffer
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;
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; OUT
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; rax = # of bytes written in name buffer
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; rdx = size of file
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;
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;
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Sys.FindFirst := 0x20
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Sys.FindNext := 0x21
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;
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; OPEN syscall
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;
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; IN
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; ax0 = name string
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;
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; OUT
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; rax = handle of file, or <0 if couldn't open
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;
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Sys.OpenFile := 0x30
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;
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; CREATE syscall
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;
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; IN
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; ax0 = name string
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;
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; OUT
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; rax = 0 on success, or <0 if couldn't open
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;
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Sys.CreateFile := 0x31
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;
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; REMOVE syscall
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;
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; IN
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; ax0 = name string
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;
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; OUT
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; rax = 0 on success, or <0 if couldn't open
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;
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Sys.RemoveFile := 0x32
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;
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; CLOSE syscall
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;
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; IN
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; ax0 = file handle
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;
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Sys.CloseFile := 0x35
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;
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; READ syscall
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;
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; IN
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; ax0 = file handle
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; ax1 = buffer address
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; ax2 = buffer size
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;
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; OUT
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; rax = number of bytes read, <0 on error
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;
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Sys.ReadFile := 0x38
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; Halt mode
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Sys.EnterHaltMode := 0x999
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# 43 "crt/crt.k" 2
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# 1 "./crt/str.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; int strnlen(char *, int)
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;
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strnlen:
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mov ecx, ax1
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scasb ax0, zero
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sub eax, ax1, ecx
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ret
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;
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; int strlen(char *)
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;
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strlen:
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mov ecx, 0x7AFFFFFF
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mov edx, ecx
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scasb ax0, zero
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sub eax, edx, ecx
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ret
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;
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; void strcpy(char *, const char *)
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;
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strcpy:
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.l:
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mov ecx, b[ax1]
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mov b[ax0], ecx
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jecxz .r
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inc ax0
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inc ax1
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jmp .l
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.r:
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ret
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;
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; void strncpy(char *, const char *, int)
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;
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strncpy:
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mov ecx, ax2
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jecxz .r
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.l:
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mov b[ax0], b[ax1]
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inc ax0
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inc ax1
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loop .l
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.r:
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ret
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;
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; void strnzcpy(char *, const char *, int)
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;
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strnzcpy:
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mov ecx, ax2
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jecxz .r
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.l:
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mov eax, b[ax1]
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mov b[ax0], eax
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jeaxz .r
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inc ax0
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inc ax1
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loop .l
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.z:
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nul b[ax0]
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.r:
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ret
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;
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; int strcmp(const char *str1, const char *str2)
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;
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; Returns:
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; 0 if the contents of both strings are equal
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; >0 if the first character that does not match has a greater value in str1 than in str2
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; <0 if the first character that does not match has a lower value in str1 than in str2
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;
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strcmp:
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nul esi
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.l:
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movzx eax, b[ax0+esi]
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movzx edx, b[ax1+esi]
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bne eax, edx, .r
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; both zero?
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add ecx, eax, edx
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jecxz .r
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inc esi
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jmp .l
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.r:
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sub eax, edx
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ret
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;
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; int strncmp(const char *str1, const char *str2, int maxn)
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;
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strncmp:
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mov ecx, ax2
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jecxz .r
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.l:
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movzx eax, b[ax0]
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movzx edx, b[ax1]
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bne eax, edx, .r
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inc ax0
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inc ax1
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loop .l
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.r:
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sub eax, edx
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ret
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;
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; char *strchrnul(const char *str, int ch)
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;
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strchrnul:
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mov ecx, 0x7AFFFFFF
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scasb ax0, ax1
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mov eax, ax0
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ret
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;
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; char *strchr(const char *str, int ch)
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;
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strchr:
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mov ecx, 0x7AFFFFFF
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scasb ax0, ax1
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bnz b[ax0], .r
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nul eax
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ret
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.r:
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mov eax, ax0
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ret
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;
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; void strrev(char *buf, const char *str)
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;
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; buf and src must NOT overlap
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;
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strrev:
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bzr b[ax1], .z
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; save str's location
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mov esi, ax1
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; go to str's end, just before
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; the null terminator
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mov ecx, 0x7AFFFFFF
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scasb ax1, zero
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dec ax1
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.l:
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; copy, going backward though str
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; and forward through buf
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mov b[ax0], b[ax1]
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beq ax1, esi, .r
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inc ax0
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dec ax1
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jmp .l
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.r:
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nul b[ax0+1]
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ret
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.z:
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nul b[ax0]
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ret
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;
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; void strrev2(char *str)
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;
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; Inverses str
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;
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strrev2:
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bzr b[ax0], .r
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mov ax1, ax0
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; go to str's end, just before
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; the null terminator
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mov ecx, 0x7AFFFFFF
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scasb ax1, zero
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dec ax1
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; increase ax0 while decreasing ax1, performing exchanges
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.l:
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blteu ax1, ax0, .r
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xchg b[ax0], b[ax1]
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inc ax0
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dec ax1
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jmp .l
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.r:
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ret
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# 44 "crt/crt.k" 2
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# 1 "./crt/mem.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; void memcpy(void *, const void *, int)
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;
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memcpy:
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mov ecx, ax2
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jecxz .r
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.l:
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sub edx, ax2, ecx
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mov b[ax0+edx], b[ax1+edx]
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loop .l
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.r:
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ret
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;
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; void memzero(void *, int)
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;
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memzero:
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mov ecx, ax1
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jecxz .r
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.l:
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nul b[ax0]
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inc ax0
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loop .l
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.r:
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ret
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# 45 "crt/crt.k" 2
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# 1 "./crt/time.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; struct TIME
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; {
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; byte sec; +0 (0-59)
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; byte min; +1 (0-59)
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; byte hour; +2 (0-23)
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; byte mday; +3 (0-31)
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; byte month; +4 (0-11)
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; byte; +5 (pad)
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; word year; +6 (0-65536)
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; word yday; +8 (0-365)
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; word; +10 (pad)
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; dword; +12 (pad)
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; } 16 bytes
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;
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;
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; int DaysInYear(int year)
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;
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DaysInYear:
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mov eax, 365
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; divisible by 4?
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rem ecx, ax0, 4
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jecxnz .end
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; divisible by 100?
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rem ecx, ax0, 100
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jecxnz .leap
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; divisible by 400?
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rem ecx, ax0, 400
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jecxnz .end
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.leap:
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inc eax
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.end:
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ret
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;
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; TIME *GetTimeUTC(void)
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;
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GetTimeUTC:
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ytime
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mov edi, .buf
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; seconds
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rem esi, eax, 60
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mov b[edi], esi
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; minutes
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div esi, eax, 60
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rem esi, 60
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mov b[edi+1], esi
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; hours
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div esi, eax, 3600
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rem esi, 24
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mov b[edi+2], esi
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; month days
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div esi, eax, 3600*24
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mov b[edi+3], esi
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; month
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mov b[edi+4], rbx
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; years
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mov w[edi+6], ecx
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;
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; ydays (TODO)
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;
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mov eax, .buf
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ret
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.buf = [24]
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# 46 "crt/crt.k" 2
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# 1 "./crt/fmt/ltostr.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; void itoa(char *buf, int num, int base)
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;
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itoa:
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mov ax3, 1
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jmp ltostr
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;
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; void utoa(char *buf, int num, int base)
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;
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utoa:
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nul ax3
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jmp ltostr
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;
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; void ltostr(char *buf, int num, int base, bool signed)
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;
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ltostr:
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mov eax, ax0
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nul ecx
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; make sure base is in [2, 32]
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bltu ax2, 2, .bad
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bltu 36, ax2, .bad
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; deal with zero
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bzr ax1, .is_zero
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; deal with base 10 signedness
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bzr ax3, .conv
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bne ax2, 10, .conv ; base 10
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shr ecx, ax1, 63 ; extract ax1 sign
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jecxz .conv
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neg ax1 ; NEG if negative
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; main loop
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.conv:
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bzr ax1, .fini
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rem edx, ax1, ax2 ; ax1 % base
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blt 9, edx, .nondec ; edx > 9 ?
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add edx, '0'
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jmp .next
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.nondec:
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add edx, 55 ; 'A' - 10
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.next:
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mov b[ax0], edx
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inc ax0
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div ax1, ax2
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jmp .conv
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; add minus flag, null-terminate and reverse
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.fini:
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jecxz .cxz
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mov b[ax0], '-'
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inc ax0
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.cxz:
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nul b[ax0]
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call strrev2, eax
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ret
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;
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; exceptional cases
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;
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.bad:
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mov b[ax0], 0
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ret
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.is_zero:
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mov b[ax0], 48 ; '0'
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mov b[ax0+1], 0
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ret
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# 48 "crt/crt.k" 2
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# 1 "./crt/fmt/strtol.k" 1
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; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; int strtol(const char *str, int base)
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;
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; eax = integer extracted from str
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; edx = pointer to first invalid byte
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;
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strtol:
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mov ax2, 1
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jmp strtoq
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;
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; int strtoul(const char *str, int base)
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;
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; eax = integer extracted from str
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; edx = pointer to first invalid byte
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;
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strtoul:
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nul ax2
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jmp strtoq
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;
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; int strtoq(const char *str, int base, bool signed)
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;
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; guesses base when 'base'=0
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;
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strtoq:
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nul eax, esi
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mov edx, ax0
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; make sure base is in [2, 32]
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beq ax1, 1, .bad
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bltu 36, ax1, .bad
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; empty string?
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bzr b[edx], .done
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.skip_spc:
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bne b[edx], ' ', .no_spc
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inc edx
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jmp .skip_spc
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.no_spc:
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; skip +
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bne b[edx], '+', .no_plus
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inc edx
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.no_plus:
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; unsigned?
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bzr ax2, .unsigned
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; parse '-'
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bne b[edx], '-', .unsigned
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inc edx
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mov esi, 1
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.unsigned:
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; base 0
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bzr ax1, .base_0
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; base prefix?
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bne b[edx], '0', .main_loop
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inc edx
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movzx ecx, b[edx]
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; "0x"/"0b" prefix
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jecxz .done ; "0"
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beq ecx, 'x', .parsed_0x
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beq ecx, 'b', .parsed_0b
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; may be octal, but we don't care
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; we accept "0110101010" (despite base=2) for instance
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jmp .main_loop
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.parsed_0x:
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; are we in base 16?
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; if not, leave eax = 0 and *edx = 'x'
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bne ax1, 16, .done
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; else
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inc edx
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jmp .main_loop
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.parsed_0b:
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; are we in base 2?
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; if not, leave eax = 0 and *edx = 'b'
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bne ax1, 2, .done
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; else
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inc edx
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jmp .main_loop
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.base_0:
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; guess base
|
|
|
|
beq b[edx], '0', .b0_not10
|
|
|
|
; must be base 10
|
|
mov ax1, 10
|
|
jmp .main_loop
|
|
|
|
.b0_not10:
|
|
inc edx
|
|
|
|
bne b[edx], 'x', .b0_not16
|
|
inc edx
|
|
mov ax1, 16
|
|
jmp .main_loop
|
|
|
|
.b0_not16:
|
|
bne b[edx], 'b', .b0_not2
|
|
inc edx
|
|
mov ax1, 2
|
|
jmp .main_loop
|
|
|
|
.b0_not2:
|
|
; take octal by default
|
|
mov ax1, 8
|
|
|
|
.main_loop:
|
|
movzx ecx, b[edx]
|
|
inc edx
|
|
|
|
; between 0 and 9?
|
|
bltu ecx, '0', .done
|
|
bltu '9', ecx, .not_digit10
|
|
|
|
; yes
|
|
sub ecx, '0'
|
|
jmp .next
|
|
|
|
.not_digit10:
|
|
bltu ecx, 'A', .done
|
|
bltu 'Z', ecx, .not_digitAZ
|
|
|
|
sub ecx, 55 ; 'A' - 10
|
|
jmp .next
|
|
|
|
.not_digitAZ:
|
|
bltu ecx, 'a', .done
|
|
bltu 'z', ecx, .done
|
|
|
|
sub ecx, 87 ; 'a' - 10
|
|
jmp .next
|
|
|
|
.next:
|
|
; too large for base?
|
|
blteu ax1, ecx, .done
|
|
|
|
mul eax, ax1
|
|
add eax, ecx
|
|
jmp .main_loop
|
|
|
|
.done:
|
|
; negative?
|
|
bzr esi, .r
|
|
|
|
; yes
|
|
neg eax
|
|
|
|
.r:
|
|
ret
|
|
|
|
.bad:
|
|
ret
|
|
# 49 "crt/crt.k" 2
|
|
# 1 "./crt/fmt/doprnt.k" 1
|
|
; The OS/K Team licenses this file to you under the MIT license.
|
|
; See the LICENSE file in the project root for more information.
|
|
|
|
;
|
|
; typedef int (*PUTC)(int ch)
|
|
; int doprnt(PUTC putc, int n, const char *fmt, va_list ap)
|
|
;
|
|
doprnt:
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
push nx0, nx1, nx2
|
|
push nx3, nx4, nx5
|
|
|
|
mov nx0, ax2 ; fmt
|
|
mov nx2, ax3 ; va_list
|
|
mov nx3, ax1 ; n
|
|
mov nx5, ax0 ; putc
|
|
nul nx4 ; return value
|
|
|
|
.main_loop:
|
|
; find '%' or null-terminator
|
|
mov ecx, 0x7AFFFFFF
|
|
mov nx1, nx0
|
|
scasb nx1, '%'
|
|
|
|
; everything below nx1 is a regular character; print it
|
|
.print_regular:
|
|
beq nx0, nx1, .check_modf
|
|
|
|
call .doput, b[nx0]
|
|
|
|
inc nx0
|
|
jmp .print_regular
|
|
|
|
.check_modf:
|
|
; did we find a '%' ?
|
|
; if not, then we found fmt's null-terminator; we're done
|
|
bne b[nx0], '%', .epilogue
|
|
|
|
; we did find a modifier / '%'
|
|
mov eax, b[nx0+1]
|
|
add nx0, 2
|
|
|
|
beq eax, 's', .modf_s
|
|
beq eax, 'c', .modf_c
|
|
beq eax, 'p', .modf_p
|
|
beq eax, 'x', .modf_x
|
|
beq eax, 'd', .modf_d
|
|
beq eax, 'o', .modf_o
|
|
beq eax, 'b', .modf_b
|
|
beq eax, '%', .modf_percent
|
|
|
|
; unrecognized
|
|
jmp .bad_modifier
|
|
|
|
.modf_s:
|
|
; get string address
|
|
mov nx1, q[nx2]
|
|
add nx2, 8
|
|
|
|
bzr nx1, .nullstring
|
|
|
|
.print_string:
|
|
movzx ax0, b[nx1]
|
|
bzr ax0, .main_loop
|
|
|
|
inc nx1
|
|
call .doput
|
|
|
|
jmp .print_string
|
|
|
|
.modf_c:
|
|
call .doput, q[nx2]
|
|
add nx2, 8
|
|
|
|
jmp .main_loop
|
|
|
|
.modf_p:
|
|
call .doput, '0'
|
|
call .doput, 'x'
|
|
; Fallthrough
|
|
|
|
.modf_x:
|
|
mov ax2, 16
|
|
jmp .print_number
|
|
|
|
.modf_d:
|
|
mov ax2, 10
|
|
jmp .print_number
|
|
|
|
.modf_o:
|
|
mov ax2, 8
|
|
jmp .print_number
|
|
|
|
.modf_b:
|
|
mov ax2, 2
|
|
jmp .print_number
|
|
|
|
.print_number:
|
|
; allocate itoa conversion buffer
|
|
sub esp, 80
|
|
mov nx1, esp
|
|
|
|
; assume modifier already set up ax2
|
|
call itoa, esp, q[nx2]
|
|
add nx2, 8
|
|
|
|
.print_itoa_buf:
|
|
movzx ax0, b[nx1]
|
|
|
|
bzr ax0, .pib_end_loop
|
|
inc nx1
|
|
|
|
call .doput
|
|
jmp .print_itoa_buf
|
|
|
|
.pib_end_loop:
|
|
add esp, 80
|
|
jmp .main_loop
|
|
|
|
.modf_percent:
|
|
call .doput, '%'
|
|
jmp .main_loop
|
|
|
|
.bad_modifier:
|
|
; print "%?" to clearly indicate that something is wrong
|
|
call .doput, '%'
|
|
call .doput, '?'
|
|
|
|
jmp .main_loop
|
|
|
|
.nullstring:
|
|
; %s was passed a NULL
|
|
call .doput, '('
|
|
call .doput, 'n'
|
|
call .doput, 'u'
|
|
call .doput, 'l'
|
|
call .doput, 'l'
|
|
call .doput, ')'
|
|
|
|
jmp .main_loop
|
|
|
|
.epilogue:
|
|
mov eax, nx4
|
|
|
|
pop nx5, nx4
|
|
pop nx3, nx2
|
|
pop nx1, nx0
|
|
|
|
leave
|
|
ret
|
|
;
|
|
; prints ax0
|
|
;
|
|
.doput:
|
|
; update print count
|
|
inc nx4
|
|
|
|
; if n==0, don't print
|
|
; we follow the C convention that sprintf()-like functions
|
|
; should return the number of characters that would have
|
|
; been printed/written if 'n' were big enough
|
|
bzr nx3, .r
|
|
|
|
; decrement n and print
|
|
dec nx3
|
|
call nx5
|
|
|
|
; did putc fail?
|
|
jeaxz .r
|
|
|
|
; yes, so artificially set n=0
|
|
nul nx3
|
|
|
|
.r:
|
|
ret
|
|
# 50 "crt/crt.k" 2
|
|
# 1 "./crt/fmt/printf.k" 1
|
|
; The OS/K Team licenses this file to you under the MIT license.
|
|
; See the LICENSE file in the project root for more information.
|
|
|
|
;
|
|
; int putc(int ch)
|
|
;
|
|
putc:
|
|
prn ax0
|
|
nul eax
|
|
ret
|
|
|
|
;
|
|
; int printf(const char *fmt, ...)
|
|
;
|
|
printf:
|
|
mov ax2, ax0
|
|
mov ax0, putc
|
|
mov ax1, 0x7AFFFFFF
|
|
add ax3, esp, 8
|
|
jmp doprnt
|
|
|
|
;
|
|
; int nprintf(const char *fmt, int n, ...)
|
|
;
|
|
nprintf:
|
|
mov ax2, ax0
|
|
mov ax0, putc
|
|
add ax3, esp, 8
|
|
jmp doprnt
|
|
|
|
;
|
|
; Print a string
|
|
; Guaranteed to only affect ecx and ax0
|
|
;
|
|
print:
|
|
.l:
|
|
movzx eax, b[ax0]
|
|
jeaxz .r
|
|
|
|
prn eax
|
|
inc ax0
|
|
|
|
jmp .l
|
|
|
|
.r:
|
|
ret
|
|
|
|
;
|
|
; Print exactly ax1 characters
|
|
;
|
|
nprint:
|
|
mov ecx, ax1
|
|
jecxz .r
|
|
|
|
.l:
|
|
prn b[ax0]
|
|
inc ax0
|
|
loop .l
|
|
|
|
.r:
|
|
ret
|
|
# 51 "crt/crt.k" 2
|
|
|
|
exit:
|
|
mov eax, Sys.Exit
|
|
trap 0
|
|
|
|
abort:
|
|
crash
|
|
# 8 "hello.k" 2
|
|
|
|
main:
|
|
mov esp, 0x104000
|
|
nul ebp
|
|
|
|
call print, .hellow
|
|
|
|
jmp exit
|
|
|
|
.hellow = "Hello World!\n"
|