827 lines
20 KiB
C
827 lines
20 KiB
C
/* Native-dependent code for LynxOS.
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Copyright 1993, 1994 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <sys/fpp.h>
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static unsigned long registers_addr (int pid);
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static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
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#define X(ENTRY)(offsetof(struct econtext, ENTRY))
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#ifdef I386
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/* Mappings from tm-i386v.h */
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static int regmap[] =
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{
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X (eax),
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X (ecx),
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X (edx),
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X (ebx),
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X (esp), /* sp */
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X (ebp), /* fp */
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X (esi),
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X (edi),
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X (eip), /* pc */
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X (flags), /* ps */
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X (cs),
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X (ss),
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X (ds),
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X (es),
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X (ecode), /* Lynx doesn't give us either fs or gs, so */
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X (fault), /* we just substitute these two in the hopes
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that they are useful. */
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};
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#endif /* I386 */
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#ifdef M68K
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/* Mappings from tm-m68k.h */
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static int regmap[] =
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{
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X (regs[0]), /* d0 */
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X (regs[1]), /* d1 */
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X (regs[2]), /* d2 */
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X (regs[3]), /* d3 */
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X (regs[4]), /* d4 */
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X (regs[5]), /* d5 */
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X (regs[6]), /* d6 */
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X (regs[7]), /* d7 */
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X (regs[8]), /* a0 */
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X (regs[9]), /* a1 */
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X (regs[10]), /* a2 */
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X (regs[11]), /* a3 */
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X (regs[12]), /* a4 */
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X (regs[13]), /* a5 */
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X (regs[14]), /* fp */
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offsetof (st_t, usp) - offsetof (st_t, ec), /* sp */
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X (status), /* ps */
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X (pc),
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X (fregs[0 * 3]), /* fp0 */
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X (fregs[1 * 3]), /* fp1 */
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X (fregs[2 * 3]), /* fp2 */
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X (fregs[3 * 3]), /* fp3 */
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X (fregs[4 * 3]), /* fp4 */
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X (fregs[5 * 3]), /* fp5 */
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X (fregs[6 * 3]), /* fp6 */
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X (fregs[7 * 3]), /* fp7 */
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X (fcregs[0]), /* fpcontrol */
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X (fcregs[1]), /* fpstatus */
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X (fcregs[2]), /* fpiaddr */
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X (ssw), /* fpcode */
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X (fault), /* fpflags */
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};
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#endif /* M68K */
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#ifdef SPARC
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/* Mappings from tm-sparc.h */
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#define FX(ENTRY)(offsetof(struct fcontext, ENTRY))
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static int regmap[] =
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{
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-1, /* g0 */
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X (g1),
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X (g2),
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X (g3),
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X (g4),
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-1, /* g5->g7 aren't saved by Lynx */
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-1,
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-1,
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X (o[0]),
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X (o[1]),
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X (o[2]),
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X (o[3]),
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X (o[4]),
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X (o[5]),
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X (o[6]), /* sp */
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X (o[7]), /* ra */
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-1, -1, -1, -1, -1, -1, -1, -1, /* l0 -> l7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* i0 -> i7 */
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FX (f.fregs[0]), /* f0 */
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FX (f.fregs[1]),
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FX (f.fregs[2]),
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FX (f.fregs[3]),
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FX (f.fregs[4]),
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FX (f.fregs[5]),
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FX (f.fregs[6]),
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FX (f.fregs[7]),
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FX (f.fregs[8]),
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FX (f.fregs[9]),
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FX (f.fregs[10]),
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FX (f.fregs[11]),
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FX (f.fregs[12]),
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FX (f.fregs[13]),
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FX (f.fregs[14]),
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FX (f.fregs[15]),
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FX (f.fregs[16]),
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FX (f.fregs[17]),
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FX (f.fregs[18]),
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FX (f.fregs[19]),
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FX (f.fregs[20]),
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FX (f.fregs[21]),
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FX (f.fregs[22]),
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FX (f.fregs[23]),
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FX (f.fregs[24]),
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FX (f.fregs[25]),
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FX (f.fregs[26]),
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FX (f.fregs[27]),
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FX (f.fregs[28]),
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FX (f.fregs[29]),
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FX (f.fregs[30]),
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FX (f.fregs[31]),
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X (y),
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X (psr),
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X (wim),
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X (tbr),
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X (pc),
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X (npc),
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FX (fsr), /* fpsr */
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-1, /* cpsr */
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};
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#endif /* SPARC */
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#ifdef rs6000
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static int regmap[] =
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{
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X (iregs[0]), /* r0 */
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X (iregs[1]),
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X (iregs[2]),
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X (iregs[3]),
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X (iregs[4]),
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X (iregs[5]),
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X (iregs[6]),
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X (iregs[7]),
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X (iregs[8]),
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X (iregs[9]),
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X (iregs[10]),
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X (iregs[11]),
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X (iregs[12]),
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X (iregs[13]),
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X (iregs[14]),
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X (iregs[15]),
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X (iregs[16]),
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X (iregs[17]),
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X (iregs[18]),
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X (iregs[19]),
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X (iregs[20]),
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X (iregs[21]),
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X (iregs[22]),
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X (iregs[23]),
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X (iregs[24]),
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X (iregs[25]),
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X (iregs[26]),
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X (iregs[27]),
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X (iregs[28]),
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X (iregs[29]),
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X (iregs[30]),
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X (iregs[31]),
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X (fregs[0]), /* f0 */
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X (fregs[1]),
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X (fregs[2]),
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X (fregs[3]),
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X (fregs[4]),
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X (fregs[5]),
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X (fregs[6]),
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X (fregs[7]),
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X (fregs[8]),
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X (fregs[9]),
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X (fregs[10]),
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X (fregs[11]),
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X (fregs[12]),
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X (fregs[13]),
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X (fregs[14]),
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X (fregs[15]),
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X (fregs[16]),
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X (fregs[17]),
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X (fregs[18]),
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X (fregs[19]),
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X (fregs[20]),
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X (fregs[21]),
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X (fregs[22]),
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X (fregs[23]),
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X (fregs[24]),
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X (fregs[25]),
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X (fregs[26]),
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X (fregs[27]),
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X (fregs[28]),
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X (fregs[29]),
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X (fregs[30]),
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X (fregs[31]),
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X (srr0), /* IAR (PC) */
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X (srr1), /* MSR (PS) */
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X (cr), /* CR */
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X (lr), /* LR */
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X (ctr), /* CTR */
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X (xer), /* XER */
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X (mq) /* MQ */
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};
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#endif /* rs6000 */
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#ifdef SPARC
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/* This routine handles some oddball cases for Sparc registers and LynxOS.
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In partucular, it causes refs to G0, g5->7, and all fp regs to return zero.
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It also handles knows where to find the I & L regs on the stack. */
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void
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fetch_inferior_registers (int regno)
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{
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int whatregs = 0;
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#define WHATREGS_FLOAT 1
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#define WHATREGS_GEN 2
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#define WHATREGS_STACK 4
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if (regno == -1)
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whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK;
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else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
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whatregs = WHATREGS_STACK;
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else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
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whatregs = WHATREGS_FLOAT;
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else
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whatregs = WHATREGS_GEN;
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if (whatregs & WHATREGS_GEN)
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{
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struct econtext ec; /* general regs */
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char buf[MAX_REGISTER_RAW_SIZE];
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int retval;
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int i;
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errno = 0;
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retval = ptrace (PTRACE_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & ec,
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0);
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if (errno)
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perror_with_name ("ptrace(PTRACE_GETREGS)");
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memset (buf, 0, REGISTER_RAW_SIZE (G0_REGNUM));
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supply_register (G0_REGNUM, buf);
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supply_register (TBR_REGNUM, (char *) &ec.tbr);
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memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &ec.g1,
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4 * REGISTER_RAW_SIZE (G1_REGNUM));
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for (i = G1_REGNUM; i <= G1_REGNUM + 3; i++)
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register_valid[i] = 1;
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supply_register (PS_REGNUM, (char *) &ec.psr);
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supply_register (Y_REGNUM, (char *) &ec.y);
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supply_register (PC_REGNUM, (char *) &ec.pc);
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supply_register (NPC_REGNUM, (char *) &ec.npc);
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supply_register (WIM_REGNUM, (char *) &ec.wim);
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memcpy (®isters[REGISTER_BYTE (O0_REGNUM)], ec.o,
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8 * REGISTER_RAW_SIZE (O0_REGNUM));
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for (i = O0_REGNUM; i <= O0_REGNUM + 7; i++)
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register_valid[i] = 1;
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}
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if (whatregs & WHATREGS_STACK)
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{
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CORE_ADDR sp;
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int i;
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sp = read_register (SP_REGNUM);
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target_read_memory (sp + FRAME_SAVED_I0,
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®isters[REGISTER_BYTE (I0_REGNUM)],
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8 * REGISTER_RAW_SIZE (I0_REGNUM));
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for (i = I0_REGNUM; i <= I7_REGNUM; i++)
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register_valid[i] = 1;
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target_read_memory (sp + FRAME_SAVED_L0,
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®isters[REGISTER_BYTE (L0_REGNUM)],
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8 * REGISTER_RAW_SIZE (L0_REGNUM));
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for (i = L0_REGNUM; i <= L0_REGNUM + 7; i++)
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register_valid[i] = 1;
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}
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if (whatregs & WHATREGS_FLOAT)
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{
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struct fcontext fc; /* fp regs */
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int retval;
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int i;
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errno = 0;
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retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) & fc,
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0);
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if (errno)
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perror_with_name ("ptrace(PTRACE_GETFPREGS)");
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memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fc.f.fregs,
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32 * REGISTER_RAW_SIZE (FP0_REGNUM));
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for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++)
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register_valid[i] = 1;
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supply_register (FPS_REGNUM, (char *) &fc.fsr);
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}
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}
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/* This routine handles storing of the I & L regs for the Sparc. The trick
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here is that they actually live on the stack. The really tricky part is
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that when changing the stack pointer, the I & L regs must be written to
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where the new SP points, otherwise the regs will be incorrect when the
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process is started up again. We assume that the I & L regs are valid at
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this point. */
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void
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store_inferior_registers (int regno)
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{
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int whatregs = 0;
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if (regno == -1)
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whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK;
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else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
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whatregs = WHATREGS_STACK;
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else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
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whatregs = WHATREGS_FLOAT;
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else if (regno == SP_REGNUM)
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whatregs = WHATREGS_STACK | WHATREGS_GEN;
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else
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whatregs = WHATREGS_GEN;
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if (whatregs & WHATREGS_GEN)
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{
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struct econtext ec; /* general regs */
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int retval;
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ec.tbr = read_register (TBR_REGNUM);
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memcpy (&ec.g1, ®isters[REGISTER_BYTE (G1_REGNUM)],
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4 * REGISTER_RAW_SIZE (G1_REGNUM));
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ec.psr = read_register (PS_REGNUM);
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ec.y = read_register (Y_REGNUM);
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ec.pc = read_register (PC_REGNUM);
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ec.npc = read_register (NPC_REGNUM);
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ec.wim = read_register (WIM_REGNUM);
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memcpy (ec.o, ®isters[REGISTER_BYTE (O0_REGNUM)],
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8 * REGISTER_RAW_SIZE (O0_REGNUM));
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errno = 0;
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retval = ptrace (PTRACE_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & ec,
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0);
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if (errno)
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perror_with_name ("ptrace(PTRACE_SETREGS)");
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}
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if (whatregs & WHATREGS_STACK)
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{
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||
int regoffset;
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CORE_ADDR sp;
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sp = read_register (SP_REGNUM);
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if (regno == -1 || regno == SP_REGNUM)
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{
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if (!register_valid[L0_REGNUM + 5])
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abort ();
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target_write_memory (sp + FRAME_SAVED_I0,
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®isters[REGISTER_BYTE (I0_REGNUM)],
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8 * REGISTER_RAW_SIZE (I0_REGNUM));
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||
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target_write_memory (sp + FRAME_SAVED_L0,
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||
®isters[REGISTER_BYTE (L0_REGNUM)],
|
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8 * REGISTER_RAW_SIZE (L0_REGNUM));
|
||
}
|
||
else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
|
||
{
|
||
if (!register_valid[regno])
|
||
abort ();
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||
if (regno >= L0_REGNUM && regno <= L0_REGNUM + 7)
|
||
regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM)
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+ FRAME_SAVED_L0;
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else
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regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (I0_REGNUM)
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+ FRAME_SAVED_I0;
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target_write_memory (sp + regoffset,
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||
®isters[REGISTER_BYTE (regno)],
|
||
REGISTER_RAW_SIZE (regno));
|
||
}
|
||
}
|
||
|
||
if (whatregs & WHATREGS_FLOAT)
|
||
{
|
||
struct fcontext fc; /* fp regs */
|
||
int retval;
|
||
|
||
/* We read fcontext first so that we can get good values for fq_t... */
|
||
errno = 0;
|
||
retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) & fc,
|
||
0);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_GETFPREGS)");
|
||
|
||
memcpy (fc.f.fregs, ®isters[REGISTER_BYTE (FP0_REGNUM)],
|
||
32 * REGISTER_RAW_SIZE (FP0_REGNUM));
|
||
|
||
fc.fsr = read_register (FPS_REGNUM);
|
||
|
||
errno = 0;
|
||
retval = ptrace (PTRACE_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) & fc,
|
||
0);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_SETFPREGS)");
|
||
}
|
||
}
|
||
#endif /* SPARC */
|
||
|
||
#if defined (I386) || defined (M68K) || defined (rs6000)
|
||
|
||
/* Return the offset relative to the start of the per-thread data to the
|
||
saved context block. */
|
||
|
||
static unsigned long
|
||
registers_addr (int pid)
|
||
{
|
||
CORE_ADDR stblock;
|
||
int ecpoff = offsetof (st_t, ecp);
|
||
CORE_ADDR ecp;
|
||
|
||
errno = 0;
|
||
stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0,
|
||
0);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_THREADUSER)");
|
||
|
||
ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) ecpoff,
|
||
0);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_PEEKTHREAD)");
|
||
|
||
return ecp - stblock;
|
||
}
|
||
|
||
/* Fetch one or more registers from the inferior. REGNO == -1 to get
|
||
them all. We actually fetch more than requested, when convenient,
|
||
marking them as valid so we won't fetch them again. */
|
||
|
||
void
|
||
fetch_inferior_registers (int regno)
|
||
{
|
||
int reglo, reghi;
|
||
int i;
|
||
unsigned long ecp;
|
||
|
||
if (regno == -1)
|
||
{
|
||
reglo = 0;
|
||
reghi = NUM_REGS - 1;
|
||
}
|
||
else
|
||
reglo = reghi = regno;
|
||
|
||
ecp = registers_addr (inferior_pid);
|
||
|
||
for (regno = reglo; regno <= reghi; regno++)
|
||
{
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
int ptrace_fun = PTRACE_PEEKTHREAD;
|
||
|
||
#ifdef M68K
|
||
ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD;
|
||
#endif
|
||
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
|
||
{
|
||
unsigned int reg;
|
||
|
||
errno = 0;
|
||
reg = ptrace (ptrace_fun, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), 0);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_PEEKUSP)");
|
||
|
||
*(int *) &buf[i] = reg;
|
||
}
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
|
||
/* Store our register values back into the inferior.
|
||
If REGNO is -1, do this for all registers.
|
||
Otherwise, REGNO specifies which register (so we can save time). */
|
||
|
||
/* Registers we shouldn't try to store. */
|
||
#if !defined (CANNOT_STORE_REGISTER)
|
||
#define CANNOT_STORE_REGISTER(regno) 0
|
||
#endif
|
||
|
||
void
|
||
store_inferior_registers (int regno)
|
||
{
|
||
int reglo, reghi;
|
||
int i;
|
||
unsigned long ecp;
|
||
|
||
if (regno == -1)
|
||
{
|
||
reglo = 0;
|
||
reghi = NUM_REGS - 1;
|
||
}
|
||
else
|
||
reglo = reghi = regno;
|
||
|
||
ecp = registers_addr (inferior_pid);
|
||
|
||
for (regno = reglo; regno <= reghi; regno++)
|
||
{
|
||
int ptrace_fun = PTRACE_POKEUSER;
|
||
|
||
if (CANNOT_STORE_REGISTER (regno))
|
||
continue;
|
||
|
||
#ifdef M68K
|
||
ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER;
|
||
#endif
|
||
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
|
||
{
|
||
unsigned int reg;
|
||
|
||
reg = *(unsigned int *) ®isters[REGISTER_BYTE (regno) + i];
|
||
|
||
errno = 0;
|
||
ptrace (ptrace_fun, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), reg);
|
||
if (errno)
|
||
perror_with_name ("ptrace(PTRACE_POKEUSP)");
|
||
}
|
||
}
|
||
}
|
||
#endif /* defined (I386) || defined (M68K) || defined (rs6000) */
|
||
|
||
/* Wait for child to do something. Return pid of child, or -1 in case
|
||
of error; store status through argument pointer OURSTATUS. */
|
||
|
||
int
|
||
child_wait (int pid, struct target_waitstatus *ourstatus)
|
||
{
|
||
int save_errno;
|
||
int thread;
|
||
union wait status;
|
||
|
||
while (1)
|
||
{
|
||
int sig;
|
||
|
||
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
||
attached process. */
|
||
pid = wait (&status);
|
||
|
||
save_errno = errno;
|
||
|
||
clear_sigint_trap ();
|
||
|
||
if (pid == -1)
|
||
{
|
||
if (save_errno == EINTR)
|
||
continue;
|
||
fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
|
||
safe_strerror (save_errno));
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
|
||
return -1;
|
||
}
|
||
|
||
if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
|
||
continue;
|
||
|
||
thread = status.w_tid; /* Get thread id from status */
|
||
|
||
/* Initial thread value can only be acquired via wait, so we have to
|
||
resort to this hack. */
|
||
|
||
if (TIDGET (inferior_pid) == 0 && thread != 0)
|
||
{
|
||
inferior_pid = BUILDPID (inferior_pid, thread);
|
||
add_thread (inferior_pid);
|
||
}
|
||
|
||
pid = BUILDPID (pid, thread);
|
||
|
||
/* We've become a single threaded process again. */
|
||
if (thread == 0)
|
||
inferior_pid = pid;
|
||
|
||
/* Check for thread creation. */
|
||
if (WIFSTOPPED (status)
|
||
&& WSTOPSIG (status) == SIGTRAP
|
||
&& !in_thread_list (pid))
|
||
{
|
||
int realsig;
|
||
|
||
realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE) 0, 0);
|
||
|
||
if (realsig == SIGNEWTHREAD)
|
||
{
|
||
/* It's a new thread notification. We don't want to much with
|
||
realsig -- the code in wait_for_inferior expects SIGTRAP. */
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
ourstatus->value.sig = TARGET_SIGNAL_0;
|
||
return pid;
|
||
}
|
||
else
|
||
error ("Signal for unknown thread was not SIGNEWTHREAD");
|
||
}
|
||
|
||
/* Check for thread termination. */
|
||
else if (WIFSTOPPED (status)
|
||
&& WSTOPSIG (status) == SIGTRAP
|
||
&& in_thread_list (pid))
|
||
{
|
||
int realsig;
|
||
|
||
realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE) 0, 0);
|
||
|
||
if (realsig == SIGTHREADEXIT)
|
||
{
|
||
ptrace (PTRACE_CONT, PIDGET (pid), (PTRACE_ARG3_TYPE) 0, 0);
|
||
continue;
|
||
}
|
||
}
|
||
|
||
#ifdef SPARC
|
||
/* SPARC Lynx uses an byte reversed wait status; we must use the
|
||
host macros to access it. These lines just a copy of
|
||
store_waitstatus. We can't use CHILD_SPECIAL_WAITSTATUS
|
||
because target.c can't include the Lynx <sys/wait.h>. */
|
||
if (WIFEXITED (status))
|
||
{
|
||
ourstatus->kind = TARGET_WAITKIND_EXITED;
|
||
ourstatus->value.integer = WEXITSTATUS (status);
|
||
}
|
||
else if (!WIFSTOPPED (status))
|
||
{
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig =
|
||
target_signal_from_host (WTERMSIG (status));
|
||
}
|
||
else
|
||
{
|
||
ourstatus->kind = TARGET_WAITKIND_STOPPED;
|
||
ourstatus->value.sig =
|
||
target_signal_from_host (WSTOPSIG (status));
|
||
}
|
||
#else
|
||
store_waitstatus (ourstatus, status.w_status);
|
||
#endif
|
||
|
||
return pid;
|
||
}
|
||
}
|
||
|
||
/* Return nonzero if the given thread is still alive. */
|
||
int
|
||
child_thread_alive (int pid)
|
||
{
|
||
/* Arggh. Apparently pthread_kill only works for threads within
|
||
the process that calls pthread_kill.
|
||
|
||
We want to avoid the lynx signal extensions as they simply don't
|
||
map well to the generic gdb interface we want to keep.
|
||
|
||
All we want to do is determine if a particular thread is alive;
|
||
it appears as if we can just make a harmless thread specific
|
||
ptrace call to do that. */
|
||
return (ptrace (PTRACE_THREADUSER, pid, 0, 0) != -1);
|
||
}
|
||
|
||
/* Resume execution of the inferior process.
|
||
If STEP is nonzero, single-step it.
|
||
If SIGNAL is nonzero, give it that signal. */
|
||
|
||
void
|
||
child_resume (int pid, int step, enum target_signal signal)
|
||
{
|
||
int func;
|
||
|
||
errno = 0;
|
||
|
||
/* If pid == -1, then we want to step/continue all threads, else
|
||
we only want to step/continue a single thread. */
|
||
if (pid == -1)
|
||
{
|
||
pid = inferior_pid;
|
||
func = step ? PTRACE_SINGLESTEP : PTRACE_CONT;
|
||
}
|
||
else
|
||
func = step ? PTRACE_SINGLESTEP_ONE : PTRACE_CONT_ONE;
|
||
|
||
|
||
/* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
|
||
it was. (If GDB wanted it to start some other way, we have already
|
||
written a new PC value to the child.)
|
||
|
||
If this system does not support PT_STEP, a higher level function will
|
||
have called single_step() to transmute the step request into a
|
||
continue request (by setting breakpoints on all possible successor
|
||
instructions), so we don't have to worry about that here. */
|
||
|
||
ptrace (func, pid, (PTRACE_ARG3_TYPE) 1, target_signal_to_host (signal));
|
||
|
||
if (errno)
|
||
perror_with_name ("ptrace");
|
||
}
|
||
|
||
/* Convert a Lynx process ID to a string. Returns the string in a static
|
||
buffer. */
|
||
|
||
char *
|
||
child_pid_to_str (int pid)
|
||
{
|
||
static char buf[40];
|
||
|
||
sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
|
||
|
||
return buf;
|
||
}
|
||
|
||
/* Extract the register values out of the core file and store
|
||
them where `read_register' will find them.
|
||
|
||
CORE_REG_SECT points to the register values themselves, read into memory.
|
||
CORE_REG_SIZE is the size of that area.
|
||
WHICH says which set of registers we are handling (0 = int, 2 = float
|
||
on machines where they are discontiguous).
|
||
REG_ADDR is the offset from u.u_ar0 to the register values relative to
|
||
core_reg_sect. This is used with old-fashioned core files to
|
||
locate the registers in a large upage-plus-stack ".reg" section.
|
||
Original upage address X is at location core_reg_sect+x+reg_addr.
|
||
*/
|
||
|
||
static void
|
||
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
|
||
CORE_ADDR reg_addr)
|
||
{
|
||
struct st_entry s;
|
||
unsigned int regno;
|
||
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
if (regmap[regno] != -1)
|
||
supply_register (regno, core_reg_sect + offsetof (st_t, ec)
|
||
+ regmap[regno]);
|
||
|
||
#ifdef SPARC
|
||
/* Fetching this register causes all of the I & L regs to be read from the
|
||
stack and validated. */
|
||
|
||
fetch_inferior_registers (I0_REGNUM);
|
||
#endif
|
||
}
|
||
|
||
|
||
/* Register that we are able to handle lynx core file formats.
|
||
FIXME: is this really bfd_target_unknown_flavour? */
|
||
|
||
static struct core_fns lynx_core_fns =
|
||
{
|
||
bfd_target_unknown_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
void
|
||
_initialize_core_lynx (void)
|
||
{
|
||
add_core_fns (&lynx_core_fns);
|
||
}
|