i was trying to use 8l's '-e' flag today, when i found some interesting problems.
first, -e doesn't do what it says unless you pass -p, which goes unmentioned in the manual page. (luckily i read the source). second, and more importantly, the calls to _tracein/_traceout are skipped, as in the following disassembly, but i can't determine why. is there some tool (besides noping with acid) meant to be used to 'turn on' the tracing calls? third, when you use -e with -p, prof.$pid files are generated as with -p, but the prof files are empty. this seems unintentional. this example is using rc. ; 8l -p -e -o 8.out code.8 exec.8 getflags.8 glob.8 here.8 io.8 lex.8 pcmd.8 pfnc.8 simple.8 subr.8 trap.8 tree.8 var.8 havefork.8 plan9.8 y.tab.8 ; acid 8.out 8.out:386 plan 9 executable /sys/lib/acid/port /sys/lib/acid/386 acid: asm(setvar) setvar 0x0000adbb JMP setvar+0x7(SB) setvar+0x2 0x0000adbd CALL _tracein(SB) setvar+0x7 0x0000adc2 SUBL $0x10,SP setvar+0xa 0x0000adc5 MOVL name+0x0(FP),CX setvar+0xe 0x0000adc9 MOVL CX,0x0(SP) setvar+0x11 0x0000adcc CALL vlook(SB) setvar+0x16 0x0000add1 MOVL AX,v+0xc(SP) setvar+0x1a 0x0000add5 MOVL 0x4(AX),AX setvar+0x1d 0x0000add8 MOVL AX,0x0(SP) setvar+0x20 0x0000addb CALL freewords(SB) setvar+0x25 0x0000ade0 MOVL v+0xc(SP),DX setvar+0x29 0x0000ade4 MOVL val+0x4(FP),CX setvar+0x2d 0x0000ade8 MOVL CX,0x4(DX) setvar+0x30 0x0000adeb MOVL $0x1,0x8(DX) setvar+0x37 0x0000adf2 ADDL $0x10,SP setvar+0x3a 0x0000adf5 RET setvar+0x3b 0x0000adf6 CALL _traceout(SB) setvar+0x40 0x0000adfb RET Xasync 0x0000adfc JMP Xasync+0x7(SB) acid: you can see there is a JMP over _tracein and a RET before _traceout. what gives?
pgpKVkRxWkLd9.pgp
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