wok annotate linld/stuff/src/_BEG.ASM @ rev 20528

linld: pascal convention calls
author Pascal Bellard <pascal.bellard@slitaz.org>
date Fri Nov 09 16:37:55 2018 +0100 (2018-11-09)
parents 049ced0bd387
children 2373992ff751
rev   line source
pascal@19515 1 ;***************************************************************
pascal@19515 2 ;****** This file is distributed under GPL
pascal@19515 3 ;***************************************************************
pascal@19515 4 ideal
pascal@19515 5 %crefref
pascal@19515 6 %noincl
pascal@19515 7 %nomacs
pascal@19636 8 p8086
pascal@19515 9
pascal@19515 10 group DGROUP _TEXT,_DATA,_BSS
pascal@19515 11 assume cs:DGROUP,ds:DGROUP
pascal@19515 12
pascal@19515 13 segment _TEXT byte public use16 'CODE'
pascal@20451 14 ends _TEXT
pascal@20451 15
pascal@20451 16 segment _DATA byte public use16 'DATA'
pascal@20451 17 global _data_start:byte
pascal@20451 18 label _data_start byte
pascal@20451 19 ifndef NO386
pascal@20451 20 msg_badcpu db "I need 386+ CPU in real mode or under VCPI manager"
pascal@20451 21 endif
pascal@20451 22 global _vcpi:byte
pascal@20451 23 _vcpi db 0
pascal@20528 24 msg_badmapping db "VCPI: low 640k need 1:1 mapping",0
pascal@20451 25
pascal@20451 26 ends _DATA
pascal@20451 27
pascal@20451 28 segment _BSS byte public use16 'BSS'
pascal@20451 29 global _bss_start:byte
pascal@20451 30 label _bss_start byte
pascal@20451 31 ifdef EXTRA
pascal@20451 32 global _cpu_features:dword
pascal@20451 33 _cpu_features dd ?
pascal@20451 34 endif
pascal@20451 35 ends _BSS
pascal@20451 36
pascal@20451 37 segment _TEXT byte public use16 'CODE'
pascal@19515 38
pascal@19825 39 macro cpuid
pascal@19825 40 db 0fh,0A2h
pascal@19825 41 endm
pascal@19825 42
pascal@19515 43 org 100h
pascal@19515 44 global _text_start:byte
pascal@19515 45 label _text_start byte
pascal@19546 46
pascal@19515 47 ;***************************************************************
pascal@19515 48 ; clear bss
pascal@19515 49 ;***************************************************************
pascal@20426 50 mov si,offset _bss_start
pascal@20457 51 mov bx, 0F000h ; cld ; cli & empty string
pascal@19515 52 clearbss:
pascal@20451 53 mov [si],bl ; clear bss + heap + sp
pascal@20426 54 inc si
pascal@19546 55 jne clearbss
pascal@19546 56
pascal@19546 57 ;***************************************************************
pascal@19546 58 ; check CPU
pascal@19546 59 ;***************************************************************
pascal@19546 60
pascal@19546 61 ; Check for oldies
pascal@19873 62 push bx ; < 286 : flags[12..15] are forced 1
pascal@19873 63 popf ; = 286 : flags[12..15] are forced 0
pascal@19873 64 pushf ; > 286 : only flags[15] is forced 0
pascal@19873 65 pop dx
pascal@20451 66 add dh,bh ; NS=386+, S+NC=286, S+C=86/186
pascal@20451 67 ifndef NO386
pascal@19873 68 mov bx,offset msg_badcpu
pascal@20457 69 js godie ;it is not a 386+
pascal@20451 70 else
pascal@20457 71 js endcpu86 ;it is not a 386+
pascal@19546 72 endif
pascal@19636 73 p386
pascal@19546 74 ; Check for vm
pascal@19546 75 smsw ax ;SMSW cannot be trapped! :-)
pascal@19571 76 and al,1 ;MSW_PE
pascal@19546 77 ; We're in vm
pascal@20457 78 jnz check_vcpi
pascal@20457 79
pascal@20457 80 check_rm_paging:
pascal@20457 81 ; It's a 386 in real mode, chk for paging (crazy but possible)
pascal@20457 82 mov eax,cr0
pascal@20457 83 inc eax ;CR0_PG to S
pascal@20457 84 jns endcpu386
pascal@20457 85 no_vcpi:
pascal@20457 86 p8086
pascal@20457 87 extrn die:near
pascal@20457 88 godie:
pascal@20457 89 call near die
pascal@19546 90
pascal@19546 91 ;***************************************************************
pascal@19546 92 ; checks for vcpi
pascal@19546 93 ;***************************************************************
pascal@19546 94 label check_vcpi near
pascal@20457 95 p386
pascal@19546 96 push ds
pascal@19546 97 ; Check whether it is safe to call 67h (we trust only known EMM managers)
pascal@20426 98 push si
pascal@19546 99 pop ds
pascal@19546 100 mov ds,[word 67h*4+2]
pascal@20426 101 cmp [dword si+10+4],'0XXX'
pascal@19546 102 jne skip
pascal@19825 103 ;mov eax,'XMME'
pascal@20426 104 ;xor eax,[dword si+10]
pascal@19546 105 ; QMME also works (as told by <J.S.Peatfield@damtp.cambridge.ac.uk>)
pascal@19825 106 ;shl eax,8
pascal@19825 107 mov ax,'ME'
pascal@20426 108 xor ax,[word si+10]
pascal@19546 109 skip:
pascal@19546 110 pop ds
pascal@19546 111 jne no_vcpi
pascal@19546 112
pascal@19546 113 ; Check emm manager status and version
pascal@19571 114 ;mov ah,40h ; get status
pascal@19571 115 ;int 67h
pascal@19571 116 ;test ah,ah
pascal@19571 117 ;jnz no_vcpi
pascal@19546 118 mov ah,46h ; get version
pascal@19546 119 int 67h
pascal@19546 120 test ah,ah
pascal@19546 121 jnz no_vcpi
pascal@19546 122 cmp al,40h ; version must be >= 4.0
pascal@19546 123 jb no_vcpi
pascal@19546 124 ; Check vcpi manager status
pascal@19546 125 ;;mov ax,5A01h ; ALLOCATE RAW PAGES
pascal@19546 126 ;;mov bx,4
pascal@19546 127 ;;int 67h
pascal@19546 128 ;;test ah,ah
pascal@19546 129 ;;jnz no_vcpi
pascal@19546 130 ;;push dx ;$ save handle
pascal@19546 131 mov ax,0DE00h ; check for vcpi present
pascal@19546 132 int 67h
pascal@19546 133 test ah,ah
pascal@19571 134 jnz no_vcpi
pascal@19546 135 is386vcpi:
pascal@19546 136 extrn prepare_vcpi:near
pascal@19546 137 call prepare_vcpi
pascal@19546 138 ; get_vcpi_interface() || die("VCPI: low 640k: need 1:1 mapping");
pascal@19546 139 ;extrn _get_vcpi_interface:near
pascal@19546 140 ;call _get_vcpi_interface
pascal@19546 141 mov bx,offset msg_badmapping
pascal@20457 142 jnz no_vcpi
pascal@20457 143 inc [byte bx+_vcpi-msg_badmapping]
pascal@20457 144 endcpu386:
pascal@20457 145 ifdef EXTRA
pascal@20457 146 pushfd
pascal@20457 147 pop dx
pascal@20457 148 pop ax
pascal@20457 149 mov bl,al
pascal@20457 150 xor al,20h ; toggle CPUID feature bit 21
pascal@20457 151 push ax
pascal@20457 152 push dx
pascal@20457 153 popfd
pascal@20457 154 pushfd
pascal@20457 155 pop dx
pascal@20457 156 pop ax
pascal@20457 157 xor al,bl ; clear C
pascal@20457 158 je @@no_cpuid ; CPUID feature bit changed ?
pascal@20457 159 mov eax,80000001h ; Extended Processor Info and Feature Bits
pascal@20457 160 cpuid
pascal@20457 161 mov [_cpu_features],edx
pascal@20457 162 @@no_cpuid:
pascal@20457 163 endif
pascal@20457 164 endcpu86:
pascal@19636 165 p8086
pascal@19546 166
pascal@19515 167 ;***************************************************************
pascal@19515 168 ; build argv & argc
pascal@19515 169 ;***************************************************************
pascal@19546 170 extrn _heap_top:word
pascal@19546 171 mov di,[_heap_top]
pascal@19546 172 ;xor ax,ax
pascal@19546 173 ;push ax ; envp (already cleared)
pascal@19546 174 ;mov [word di],ax ; argv[0] = 0 (idem)
pascal@19515 175 mov si,80h
pascal@19515 176 lodsb
pascal@19515 177 cmp al,7Eh
pascal@19515 178 jbe alok
pascal@19515 179 mov al,7Eh
pascal@19515 180 alok:
pascal@19546 181 cbw
pascal@19515 182 xchg ax,bx
pascal@19515 183 mov [bx+si],bh ; set eos
pascal@19515 184 argbuild:
pascal@20160 185 ifdef DEBUG
pascal@20142 186 p386
pascal@20142 187 pusha
pascal@20142 188 mov bx,si
pascal@20142 189 extrn puts:near
pascal@20142 190 call puts
pascal@20142 191 popa
pascal@20160 192 endif
pascal@19515 193 mov bx,2 ; argc * 2
pascal@19515 194 argeos:
pascal@20451 195 mov cx,1 ; look for a start of string
pascal@19515 196 mov [byte si-1],bh ; mark eos
pascal@19515 197 mov ah,20h ; space will be eos
pascal@19515 198 arglp:
pascal@19515 199 lodsb
pascal@19515 200 cmp al,0h
pascal@19515 201 je argdone
pascal@19515 202 cmp al,20h
pascal@19515 203 jb argeos
pascal@19515 204 cmp al,ah
pascal@19515 205 je argeos
pascal@19515 206 cmp al,27h
pascal@19515 207 je isargstr
pascal@19515 208 cmp al,22h
pascal@19515 209 je isargstr
pascal@20451 210 jcxz arglp ; not start of string
pascal@19515 211 dec si
pascal@19884 212 ;jmp newarg
pascal@20451 213 db 0BAh ; mov dx,im opcode
pascal@19515 214 isargstr:
pascal@19515 215 mov ah,al ; expected eos
pascal@19515 216 newarg:
pascal@19515 217 mov [word bx+di],si ; argv[argc++] = si
pascal@19515 218 inc bx
pascal@19515 219 inc bx
pascal@20451 220 dec cx
pascal@19515 221 jmp arglp
pascal@19515 222 argdone:
pascal@19515 223 ;mov [word bx+di],0 ; argv[argc] = 0
pascal@19546 224 lea ax,[bx+di+2]
pascal@19546 225 mov [_heap_top],ax
pascal@19515 226 push di ; argv
pascal@19515 227 shr bx,1
pascal@19515 228 push bx ; argc
pascal@19515 229 ifndef filearg
pascal@19515 230 mov bx,[di+2] ; argv[1]
pascal@20528 231 extrn openargs:near
pascal@20528 232 call near openargs
pascal@19515 233 jc argend
pascal@19515 234 pop bx ; trash argc, argv >> 1Kb !
pascal@19546 235 global read_cmdline:near
pascal@20528 236 pop cx ; sizemax=argv
pascal@19546 237 read_cmdline:
pascal@20528 238 mov dx,di
pascal@20528 239 push dx
pascal@19515 240 push ax
pascal@20528 241 xchg ax,bx
pascal@20528 242 extrn @read$cxdxbx:near ; read(fd=bx,buffer=dx,size=cx)
pascal@20528 243 call near @read$cxdxbx
pascal@19515 244 pop bx ; fd for close
pascal@19515 245 pop si ; si=buffer=argv
pascal@19515 246 add di,ax
pascal@19515 247 extrn close:near
pascal@19515 248 call near close
pascal@19515 249 jmp argbuild
pascal@19515 250 argend:
pascal@19515 251 endif
pascal@19515 252
pascal@19515 253 ;***************************************************************
pascal@19515 254 extrn _main:near
pascal@19515 255 call _main
pascal@19538 256
pascal@19515 257 ;***************************************************************
pascal@19515 258 global exit:near
pascal@19515 259 exit:
pascal@19515 260 mov ah,4Ch
pascal@19515 261 int 21h
pascal@19515 262 ends _TEXT
pascal@19515 263
pascal@19515 264
pascal@19515 265 end _text_start
pascal@19515 266
pascal@19515 267 ;###### END OF FILE ############################################