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Annotation of 42BSD/ucb/pascal/pdx/process/rdwr.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)rdwr.c 1.1 1/18/82";
        !             4: 
        !             5: /*
        !             6:  * These routines are used to access the debuggee process from
        !             7:  * outside the "process" module.
        !             8:  *
        !             9:  * They invoke "pio" which eventually leads to a call to "ptrace".
        !            10:  * The system generates an I/O error when a ptrace fails, we catch
        !            11:  * that here and assume its due to a misguided address.
        !            12:  */
        !            13: 
        !            14: #include "defs.h"
        !            15: #include <errno.h>
        !            16: #include "process.h"
        !            17: #include "process.rep"
        !            18: 
        !            19: #      if (isvaxpx)
        !            20: #              include "pxinfo.h"
        !            21: #      endif
        !            22: 
        !            23: typedef int INTFUNC();
        !            24: 
        !            25: extern INTFUNC *onsyserr();
        !            26: 
        !            27: LOCAL badaddr;
        !            28: LOCAL rwerr();
        !            29: 
        !            30: /*
        !            31:  * Read from the process' instruction area.  For px, this is actually
        !            32:  * the data area.
        !            33:  */
        !            34: 
        !            35: iread(buff, addr, nbytes)
        !            36: char *buff;
        !            37: ADDRESS addr;
        !            38: int nbytes;
        !            39: {
        !            40:        INTFUNC *f;
        !            41: 
        !            42:        f = onsyserr(EIO, &rwerr);
        !            43: #      if (isvaxpx)
        !            44:                badaddr = addr + ENDOFF;
        !            45:                pio(process, PREAD, DATASEG, buff, addr + ENDOFF, nbytes);
        !            46: #      else
        !            47:                badaddr = addr;
        !            48:                pio(process, PREAD, TEXTSEG, buff, addr, nbytes);
        !            49: #      endif
        !            50:        onsyserr(EIO, f);
        !            51: }
        !            52: 
        !            53: /* 
        !            54:  * Write to the process' instruction area, usually in order to set
        !            55:  * or unset a breakpoint.
        !            56:  */
        !            57: 
        !            58: iwrite(buff, addr, nbytes)
        !            59: char *buff;
        !            60: ADDRESS addr;
        !            61: int nbytes;
        !            62: {
        !            63:        INTFUNC *f;
        !            64: 
        !            65:        f = onsyserr(EIO, &rwerr);
        !            66: #      if (isvaxpx)
        !            67:                badaddr = addr + ENDOFF;
        !            68:                pio(process, PWRITE, DATASEG, buff, addr + ENDOFF, nbytes);
        !            69: #      else
        !            70:                badaddr = addr;
        !            71:                pio(process, PWRITE, TEXTSEG, buff, addr, nbytes);
        !            72: #      endif
        !            73:        onsyserr(EIO, f);
        !            74: }
        !            75: 
        !            76: /*
        !            77:  * Read for the process' data area.
        !            78:  */
        !            79: 
        !            80: dread(buff, addr, nbytes)
        !            81: char *buff;
        !            82: ADDRESS addr;
        !            83: int nbytes;
        !            84: {
        !            85:        INTFUNC *f;
        !            86: 
        !            87:        f = onsyserr(EIO, &rwerr);
        !            88:        badaddr = addr;
        !            89:        pio(process, PREAD, DATASEG, buff, addr, nbytes);
        !            90:        onsyserr(EIO, f);
        !            91: }
        !            92: 
        !            93: /*
        !            94:  * Write to the process' data area.
        !            95:  */
        !            96: 
        !            97: dwrite(buff, addr, nbytes)
        !            98: char *buff;
        !            99: ADDRESS addr;
        !           100: int nbytes;
        !           101: {
        !           102:        INTFUNC *f;
        !           103: 
        !           104:        f = onsyserr(EIO, &rwerr);
        !           105:        badaddr = addr;
        !           106:        pio(process, PWRITE, DATASEG, buff, addr, nbytes);
        !           107:        onsyserr(EIO, f);
        !           108: }
        !           109: 
        !           110: /*
        !           111:  * Error handler.
        !           112:  */
        !           113: 
        !           114: LOCAL rwerr()
        !           115: {
        !           116:        error("bad read/write process address 0x%x", badaddr);
        !           117: }

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