wok diff runcom/stuff/debug.S @ rev 12993
Up: krb5 to 1.10.2.
| author | Christopher Rogers <slaxemulator@gmail.com> |
|---|---|
| date | Wed Jun 06 05:40:27 2012 +0000 (2012-06-06) |
| parents | |
| children | f32d3ba00836 |
line diff
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/runcom/stuff/debug.S Wed Jun 06 05:40:27 2012 +0000 1.3 @@ -0,0 +1,493 @@ 1.4 +// Usage: 1.5 +// 1.6 +// f DX:CX load one CHS sector to 0000:7C00 1.7 +// t trace one step 1.8 +// g <address> go to adrs 1.9 +// d <address> display 16 bytes, CR for next 16 bytes... 1.10 +// e <address> <words>... enter memory byte/word/dword 1.11 +// m <segment> self move 1.12 +// + <segment> default segment offset 1.13 +// 1.14 +// Example: 1.15 +// m 0FC0 move debugger to 0FC0:0000 0FC0:01FF 1.16 +// f 1 read floppy boot sector to 0000:7C00 1.17 +// f 80 1 read hard disk master boot sector to 0000:7C00 1.18 +// g 7C0E ... 1.19 + 1.20 +#define REGS32 28 bytes display FS, GS and 32 bits datas for AX..DI 1.21 +#define ADJESDI 16 bytes add segment overflow support for e and d 1.22 +#define ASCIIDUMP 20 bytes display hexa and ascii datas 1.23 +#define INPUTBUFFER 3 bytes overload init code with a 32+ bytes input buffer 1.24 + 1.25 +.macro pushib val 1.26 + .byte 0x6A, \val-_start 1.27 +.endm 1.28 + 1.29 +#ifdef REGS32 1.30 +#define SEGREGSZ 10 1.31 +#define REGSZ 32 1.32 +#define USER_SP REGSZ+SEGREGSZ-28(%bp) 1.33 +#define FIXSP 14 1.34 +#else 1.35 +#define SEGREGSZ 6 1.36 +#define REGSZ 16 1.37 +#define USER_SP REGSZ+SEGREGSZ-14(%bp) 1.38 +#define FIXSP 10 1.39 +#endif 1.40 +#define USER_FLAGS REGSZ+SEGREGSZ+4(%bp) 1.41 +#define USER_FLAGS_HIGH REGSZ+SEGREGSZ+5(%bp) 1.42 +#define USER_IP REGSZ+SEGREGSZ(%bp) 1.43 +#define USER_CS REGSZ+SEGREGSZ+2(%bp) 1.44 +#define USER_CSIP REGSZ+SEGREGSZ(%bp) 1.45 + 1.46 +#ifdef INPUTBUFFER 1.47 +//#define ABS(x) (x-(setvectors-_start)) 1.48 +#define ABS(x) (x-32) 1.49 +#else 1.50 +#define ABS(x) (x) 1.51 +#endif 1.52 +.macro initcode 1.53 + movw $0x0FC0, %di # move (and jump) to 0FC0:0000 1.54 + subw $_startz-_start, USER_IP 1.55 + movw USER_IP, %ax 1.56 + shrw $4, %ax # _start MUST be aligned on paragraph 1.57 + addw USER_CS, %ax # normalize %cs to have _start=0 1.58 + movw %ax, %ds 1.59 +.endm 1.60 + 1.61 + .text 1.62 + .code16 1.63 + .org 0 1.64 + 1.65 + .globl _start 1.66 +_start: 1.67 + pushf 1.68 + pushw %cs 1.69 + stc 1.70 + call init # the start code will be overwritten by the input buffer 1.71 +_startz: 1.72 + 1.73 +#ifdef INPUTBUFFER 1.74 +isinit: 1.75 + initcode 1.76 + addw $FIXSP, USER_SP # adjust SP with [FLAGS CS IP DS ES [FS GS]] size 1.77 + pushib setvectors 1.78 + jmp moveself 1.79 +#endif 1.80 + 1.81 +setvectors: 1.82 + xorw %si, %si # set interrupt vectors in 0 segment 1.83 + movw %si, %ds 1.84 + movb $0x7D, %cl # skip nmi 1.85 +hooklp: # interrupts: 0=div0 1=step 2=nmi 3=brk 4=ov 5=bound 6=invalid 1.86 + pushw %cs 1.87 + pushib ABS(dbgstart) # set %cs:dbgstart 1.88 + popl (%si) # to interrupt vector 1.89 +skiphook: 1.90 + lodsl # %si += 4 1.91 + shrb $1,%cl 1.92 + jnc skiphook 1.93 + jnz hooklp # note %cx will be cleared: SP will be untouched 1.94 + decw (3-7)*4(%si) # update int3 vector 1.95 + jmp dbgstartz # registers are already pushed by startup code 1.96 + 1.97 +regs: 1.98 + .ascii "ss" 1.99 + .ascii "di" 1.100 + .ascii "si" 1.101 + .ascii "bp" 1.102 + .ascii "sp" 1.103 + .ascii "bx" 1.104 + .ascii "dx" 1.105 + .ascii "cx" 1.106 + .ascii "ax" 1.107 +#ifdef REGS32 1.108 + .ascii "gs" 1.109 + .ascii "fs" 1.110 +#endif 1.111 + .ascii "es" 1.112 + .ascii "ds" 1.113 + .ascii "ip" 1.114 + .ascii "cs" 1.115 +# Bit Label Desciption 1.116 +# --------------------------- 1.117 +# 0 CF Carry flag 1.118 +# 2 PF Parity flag 1.119 +# 4 AF Auxiliary carry flag 1.120 +# 6 ZF Zero flag 1.121 +# 7 SF Sign flag 1.122 +# 8 TF Trap flag 1.123 +# 9 IF Interrupt enable flag 1.124 +# 10 DF Direction flag 1.125 +# 11 OF Overflow flag 1.126 +#ifdef REGS32 1.127 + .ascii "odi|sz|a|p|c" # flags bits 1.128 +#else 1.129 + .ascii "oditsz?a?p c=" # flags bits 1.130 +#endif 1.131 +# 12-13 IOPL I/O Priviledge level 1.132 +# 14 NT Nested task flag 1.133 +# 16 RF Resume flag 1.134 +# 17 VM Virtual 8086 mode flag 1.135 +# 18 AC Alignment check flag (486+) 1.136 +# 19 VIF Virutal interrupt flag 1.137 +# 20 VIP Virtual interrupt pending flag 1.138 +# 21 ID ID flag 1.139 + 1.140 +#ifdef INPUTBUFFER 1.141 +ismove: 1.142 + pushw %ax 1.143 +moveself: 1.144 + popw %si 1.145 +#else 1.146 +isinit: 1.147 + initcode 1.148 +ismove: 1.149 + xorw %si, %si 1.150 +#endif 1.151 + movw %di, %es # move code to %di:0 1.152 + pushw %di 1.153 +#ifdef INPUTBUFFER 1.154 + xorw %di, %di # and jmp into (%di:setvectors) with retf 1.155 +#else 1.156 + movw $setvectors, %di # and jmp into (%di:setvectors) with retf 1.157 + movw %di, %si 1.158 +#endif 1.159 + movw $_end-setvectors, %cx 1.160 + pushw %di 1.161 + rep movsb 1.162 + retf 1.163 + 1.164 +int3: 1.165 + .byte 0x68 # push $0x086A OV UP DI NT PL ZR - NA - PO - NC 1.166 +# interrupt entry point: the registers [FLAGS CS IP] are already pushed 1.167 +dbgstart: 1.168 + .byte 0x6A, 0x08 # push $0x08 NV UP DI NT PL NZ - NA - PO - NC 1.169 + popf 1.170 +init: 1.171 + pushw %ds 1.172 + pushw %es 1.173 +#ifdef REGS32 1.174 + pushw %fs 1.175 + pushw %gs 1.176 + pushal # [FLAGS CS IP DS ES FS GS] EAX ECX EDX EBX ESP EBP ESI EDI [SS] 1.177 +#else 1.178 + pushaw # [FLAGS CS IP DS ES] AX CX DX BX SP BP SI DI [SS] 1.179 +#endif 1.180 + pushw %ss 1.181 + movw %sp, %bp 1.182 +#ifndef INPUTBUFFER 1.183 + pushf 1.184 + addw $FIXSP, USER_SP # adjust SP with [FLAGS CS IP DS ES [FS GS]] size 1.185 + popf 1.186 +#endif 1.187 + jc isinit 1.188 + jnz notint3 1.189 + decw USER_IP 1.190 + lesw USER_CSIP, %di 1.191 +#define OPCODE_BRK 0xCC 1.192 + .byte 0xB0 # movb $IM, %al 1.193 +break: 1.194 + .byte 0xCC 1.195 + stosb 1.196 +notint3: 1.197 +#ifdef INPUTBUFFER 1.198 + addw $FIXSP, USER_SP # adjust SP with [FLAGS CS IP DS ES [FS GS]] size 1.199 +#endif 1.200 +dbgstartz: 1.201 +dbgregslp: 1.202 + pushw %cs 1.203 + popw %ds 1.204 + movw $ABS(regs), %si 1.205 +#ifdef REGS32 1.206 + subw %si, %bp 1.207 + movw $15, %cx 1.208 +#else 1.209 + movw $13, %cx 1.210 +#endif 1.211 +regslp: 1.212 + call putreg # display register name and value 1.213 + loop regslp 1.214 +#ifdef REGS32 1.215 + movw (%bp,%si), %dx # get flags 1.216 +#else 1.217 + movw USER_FLAGS, %dx 1.218 + pushw %si 1.219 + stc # add trailing = 1.220 +#endif 1.221 + movb $13, %cl 1.222 + rcrw %cl, %dx 1.223 +nextbit: 1.224 + lodsb 1.225 + shlw $1, %dx 1.226 +#ifdef REGS32 1.227 + jnc skipflag 1.228 + cmpb $'|', %al # remove system flags 1.229 + je skipflag 1.230 + call dbgputc 1.231 +skipflag: 1.232 +#else 1.233 + call dbgputcbit # display active flags bits 1.234 +#endif 1.235 + loop nextbit 1.236 +#ifdef REGS32 1.237 + movw %sp, %bp 1.238 +#else 1.239 + popw %si 1.240 + movb $8, %cl 1.241 +stacklp: 1.242 + lodsw # si += 2 1.243 + call putr16 # display flags and the beginning of the stack 1.244 + loop stacklp 1.245 +#endif 1.246 + call getline 1.247 + lodsb 1.248 + xchgw %ax, %di 1.249 + call getval 1.250 + .byte 0x81, 0xC3 # addw $0, %bx 1.251 +offset_value: 1.252 + .word 0 1.253 + movw %bx, %es 1.254 + xchgw %ax, %di 1.255 + subb $'m', %al 1.256 + je ismove 1.257 + subb $'+'-'m', %al 1.258 + jne not_offset 1.259 + movw %di, ABS(offset_value) 1.260 +not_offset: 1.261 + orb $1, USER_FLAGS_HIGH # set TF 1.262 + subb $'t'-'+', %al 1.263 + je done 1.264 + subb $'d'-'t', %al 1.265 + xchgw %ax, %cx 1.266 + jcxz dump # 'd' ? 1.267 + loop noenter # 'e' ? 1.268 +nextval: 1.269 + call getval 1.270 + jcxz dbgregslp 1.271 + xchgb %dl, %dh 1.272 +mextmsb: 1.273 + stosb 1.274 + xchgw %ax, %dx 1.275 + xchgb %al, %dh 1.276 +#ifdef ADJESDI 1.277 + call adjustESDI 1.278 +#endif 1.279 + decw %cx 1.280 + loopne mextmsb 1.281 + jmp nextval 1.282 +noenter: 1.283 + loop not_floppy_load # f DX:CX ? 1.284 + movw %es, %dx 1.285 + movw %cx, %es 1.286 + movw %di, %cx 1.287 + movw $0x0201, %ax 1.288 + movw $0x7C00, %bx 1.289 + pushw %bx 1.290 + int $0x13 1.291 + popw %di 1.292 +godbgregslpifc: 1.293 + jc dbgregslp 1.294 +dump: 1.295 + movw %es, %ax 1.296 + call putax 1.297 + movw %di, %ax 1.298 + call putax 1.299 + movw $16, %cx 1.300 +dhex: 1.301 + movb %es:(%di), %ah 1.302 +#ifdef ASCIIDUMP 1.303 + movb %ah, (%si) 1.304 + incw %si 1.305 +#endif 1.306 +#ifdef ADJESDI 1.307 + call incESDI 1.308 +#else 1.309 + incw %di 1.310 +#endif 1.311 +#ifdef REGS32 1.312 + movb $0x30, %dh # the data has 2 digits 1.313 +#else 1.314 + movb $0x01, %dh # the data has 2 digits 1.315 +#endif 1.316 + call putx 1.317 + loop dhex 1.318 +#ifdef ASCIIDUMP 1.319 + movb $16, %cl 1.320 + subw %cx, %si 1.321 +dascii: 1.322 + lodsb 1.323 + cmpb $0x7F, %al 1.324 + jnc skipascii 1.325 + cmpb $0x20, %al 1.326 + cmc 1.327 +skipascii: 1.328 + call dbgputcbit 1.329 + loop dascii 1.330 +#endif 1.331 + call dbgputcr 1.332 + int $0x16 1.333 + cmpb $13, %al 1.334 + je dump 1.335 +notdump: 1.336 +not_floppy_load: 1.337 + stc 1.338 + loop godbgregslpifc # g ? 1.339 +isgo: 1.340 + andb $0xfe, USER_FLAGS_HIGH # clear TF 1.341 + xchgw %ax, %cx 1.342 + jcxz done 1.343 +setbreak: 1.344 + movb $OPCODE_BRK, %al 1.345 + xchgb %al, %es:(%di) 1.346 + movb %al, ABS(break) 1.347 +done: 1.348 + popw %ax # %ss 1.349 +#ifdef REGS32 1.350 + popal 1.351 + popw %gs 1.352 + popw %fs 1.353 +#else 1.354 + popaw 1.355 +#endif 1.356 + popw %es 1.357 + popw %ds 1.358 + iret 1.359 + 1.360 +#ifdef ADJESDI 1.361 +adjustESDI: 1.362 + decw %di 1.363 +incESDI: 1.364 + incw %di 1.365 + jnz esok 1.366 + pushw %es 1.367 + addb $0x10,-3(%bp) 1.368 + popw %es 1.369 +esok: 1.370 + ret 1.371 +#endif 1.372 + 1.373 +putreg: 1.374 + call dbgput2c 1.375 + movb $'=', %al 1.376 + call dbgputc 1.377 +putr16: 1.378 +#ifdef REGS32 1.379 + movl -2(%bp,%si), %eax 1.380 + movw $0x3FC0, %dx # check bits 7..14 1.381 + shrw %cl, %dx 1.382 +putax: 1.383 + movb $0xF0, %dh # the data has 4 digits 1.384 + jnc putx # 16 bits register ? 1.385 + incw %bp # a 32 bits register, not 16 bits 1.386 + incw %bp 1.387 + movb $0xFF, %dh # the data has 8 digits 1.388 + jmp putx 1.389 +putxlp: 1.390 +#else 1.391 +# movw _start-ABS(regs)-2(%bp,%si), %ax 1.392 + .byte 0x8b, 0x42, _start-ABS(regs)-2 1.393 +putax: 1.394 + movb $0x07, %dh # the data has 4 digits 1.395 +putx: 1.396 +putxlp: 1.397 + rolw $4, %ax 1.398 +#endif 1.399 + pushw %ax 1.400 + andb $0xf, %al 1.401 + addb $0x90, %al 1.402 + daa 1.403 + adcb $0x40, %al 1.404 + daa 1.405 + call dbgputc 1.406 + popw %ax 1.407 +#ifdef REGS32 1.408 +putx: 1.409 + roll $4, %eax 1.410 +#endif 1.411 + shrb $1, %dh 1.412 + jc putxlp 1.413 +#ifdef REGS32 1.414 + jnz putx 1.415 +#endif 1.416 +dbgputcbit: 1.417 + jc dbgputc 1.418 + mov $0x20, %al 1.419 +dbgputc: 1.420 + movw $7, %bx 1.421 + mov $0xE, %ah 1.422 + int $0x10 1.423 + xchgw %ax, %bx 1.424 +# clc # for putax 1.425 + ret 1.426 + 1.427 +# get value in DX:AX, BX is segment CX is digits count. 1.428 +getval: 1.429 + xorw %ax, %ax 1.430 + xorw %bx, %bx 1.431 + xorw %cx, %cx 1.432 +getvalz: 1.433 + xchgw %ax, %bx 1.434 + cwd 1.435 + decw %cx 1.436 +isx: 1.437 + shll $4, %edx 1.438 + orb %al, %dl 1.439 + incw %cx 1.440 +gotspc: 1.441 +getvallp: 1.442 + lodsb 1.443 + cmpb $0x20, %al # heat heading spaces 1.444 + jne notspc 1.445 + jcxz gotspc 1.446 +notspc: 1.447 + subb $'0', %al 1.448 + cmpb $10, %al # in 0..9 ? 1.449 + jb isx 1.450 + subb $'a'-'0'-10, %al 1.451 + cmpb $16, %al # in a..f ? 1.452 + jb isx 1.453 + cmpb $':'-'a'+10, %al 1.454 + pushl %edx 1.455 + popw %ax 1.456 + popw %dx 1.457 + je getvalz # store segment in %bx 1.458 + pushw %dx 1.459 + shlw $12, %dx 1.460 + orw %dx, %bx 1.461 + popw %dx 1.462 + ret 1.463 + 1.464 +getline: 1.465 + call dbgputcr 1.466 +getlinebs: 1.467 + cmpw $ABS(buffer), %si 1.468 + je getc 1.469 + decw %si 1.470 +getlinelp: 1.471 + call dbgputc 1.472 +getc: 1.473 + int $0x16 1.474 + cmpb $8, %al 1.475 + je getlinebs 1.476 + orb $0x20, %al 1.477 + movb %al, (%si) 1.478 + inc %si 1.479 + cmpb $0x2D, %al 1.480 + jne getlinelp 1.481 +dbgputcr: 1.482 + movw $ABS(crlf), %si 1.483 +dbgput2c: 1.484 + call dbgput1c 1.485 +dbgput1c: 1.486 + lodsb 1.487 + jmp dbgputc 1.488 + 1.489 +crlf: 1.490 + .byte 13,10 1.491 +_end: 1.492 +buffer: 1.493 + 1.494 + .org 510 1.495 + .byte 0x55, 0xAA 1.496 +