160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/* Native support for MIPS running SVR4, for GDB.
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Copyright 1994, 1995 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, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include <sys/time.h>
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#include <sys/procfs.h>
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#include <setjmp.h> /* For JB_XXX. */
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 4
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/*
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* See the comment in m68k-tdep.c regarding the utility of these functions.
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*
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* These definitions are from the MIPS SVR4 ABI, so they may work for
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* any MIPS SVR4 target.
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*/
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void
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supply_gregset (gregsetp)
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gregset_t *gregsetp;
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{
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register int regi;
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register greg_t *regp = &(*gregsetp)[0];
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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for (regi = 0; regi <= CXT_RA; regi++)
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supply_register (regi, (char *)(regp + regi));
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supply_register (PC_REGNUM, (char *)(regp + CXT_EPC));
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supply_register (HI_REGNUM, (char *)(regp + CXT_MDHI));
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supply_register (LO_REGNUM, (char *)(regp + CXT_MDLO));
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supply_register (CAUSE_REGNUM, (char *)(regp + CXT_CAUSE));
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/* Fill inaccessible registers with zero. */
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supply_register (PS_REGNUM, zerobuf);
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supply_register (BADVADDR_REGNUM, zerobuf);
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supply_register (FP_REGNUM, zerobuf);
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supply_register (UNUSED_REGNUM, zerobuf);
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for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
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supply_register (regi, zerobuf);
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}
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void
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fill_gregset (gregsetp, regno)
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gregset_t *gregsetp;
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int regno;
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{
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int regi;
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register greg_t *regp = &(*gregsetp)[0];
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for (regi = 0; regi <= 32; regi++)
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if ((regno == -1) || (regno == regi))
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*(regp + regi) = *(greg_t *) ®isters[REGISTER_BYTE (regi)];
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if ((regno == -1) || (regno == PC_REGNUM))
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*(regp + CXT_EPC) = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)];
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if ((regno == -1) || (regno == CAUSE_REGNUM))
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*(regp + CXT_CAUSE) = *(greg_t *) ®isters[REGISTER_BYTE (CAUSE_REGNUM)];
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if ((regno == -1) || (regno == HI_REGNUM))
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*(regp + CXT_MDHI) = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)];
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if ((regno == -1) || (regno == LO_REGNUM))
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*(regp + CXT_MDLO) = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)];
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}
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/*
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* Now we do the same thing for floating-point registers.
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* We don't bother to condition on FP0_REGNUM since any
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* reasonable MIPS configuration has an R3010 in it.
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*
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* Again, see the comments in m68k-tdep.c.
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*/
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void
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supply_fpregset (fpregsetp)
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fpregset_t *fpregsetp;
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{
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register int regi;
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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for (regi = 0; regi < 32; regi++)
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supply_register (FP0_REGNUM + regi,
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(char *)&fpregsetp->fp_r.fp_regs[regi]);
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supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr);
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/* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
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supply_register (FCRIR_REGNUM, zerobuf);
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}
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void
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fill_fpregset (fpregsetp, regno)
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fpregset_t *fpregsetp;
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int regno;
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{
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int regi;
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char *from, *to;
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for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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from = (char *) ®isters[REGISTER_BYTE (regi)];
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to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
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memcpy(to, from, REGISTER_RAW_SIZE (regi));
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}
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}
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if ((regno == -1) || (regno == FCRCS_REGNUM))
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fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)];
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}
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from which
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we extract the pc (_JB_PC) that we will land at. The pc is copied into PC.
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This routine returns true on success. */
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int
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get_longjmp_target (pc)
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CORE_ADDR *pc;
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{
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char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
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CORE_ADDR jb_addr;
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jb_addr = read_register (A0_REGNUM);
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if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf,
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TARGET_PTR_BIT / TARGET_CHAR_BIT))
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return 0;
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*pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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return 1;
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}
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