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[/] [or1k_old/] [tags/] [start/] [insight/] [gdb/] [mipsv4-nat.c] - Rev 1782
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/* Native support for MIPS running SVR4, for GDB. Copyright 1994, 1995, 2000, 2001 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "inferior.h" #include "gdbcore.h" #include "target.h" #include "regcache.h" #include <sys/time.h> #include <sys/procfs.h> #include <setjmp.h> /* For JB_XXX. */ /* Prototypes for supply_gregset etc. */ #include "gregset.h" /* Size of elements in jmpbuf */ #define JB_ELEMENT_SIZE 4 /* * See the comment in m68k-tdep.c regarding the utility of these functions. * * These definitions are from the MIPS SVR4 ABI, so they may work for * any MIPS SVR4 target. */ void supply_gregset (gregset_t *gregsetp) { register int regi; register greg_t *regp = &(*gregsetp)[0]; static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; for (regi = 0; regi <= CXT_RA; regi++) supply_register (regi, (char *) (regp + regi)); supply_register (PC_REGNUM, (char *) (regp + CXT_EPC)); supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI)); supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO)); supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE)); /* Fill inaccessible registers with zero. */ supply_register (PS_REGNUM, zerobuf); supply_register (BADVADDR_REGNUM, zerobuf); supply_register (FP_REGNUM, zerobuf); supply_register (UNUSED_REGNUM, zerobuf); for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++) supply_register (regi, zerobuf); } void fill_gregset (gregset_t *gregsetp, int regno) { int regi; register greg_t *regp = &(*gregsetp)[0]; for (regi = 0; regi <= 32; regi++) if ((regno == -1) || (regno == regi)) *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)]; if ((regno == -1) || (regno == PC_REGNUM)) *(regp + CXT_EPC) = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)]; if ((regno == -1) || (regno == CAUSE_REGNUM)) *(regp + CXT_CAUSE) = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)]; if ((regno == -1) || (regno == HI_REGNUM)) *(regp + CXT_MDHI) = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)]; if ((regno == -1) || (regno == LO_REGNUM)) *(regp + CXT_MDLO) = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)]; } /* * Now we do the same thing for floating-point registers. * We don't bother to condition on FP0_REGNUM since any * reasonable MIPS configuration has an R3010 in it. * * Again, see the comments in m68k-tdep.c. */ void supply_fpregset (fpregset_t *fpregsetp) { register int regi; static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; for (regi = 0; regi < 32; regi++) supply_register (FP0_REGNUM + regi, (char *) &fpregsetp->fp_r.fp_regs[regi]); supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr); /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */ supply_register (FCRIR_REGNUM, zerobuf); } void fill_fpregset (fpregset_t *fpregsetp, int regno) { int regi; char *from, *to; for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) { if ((regno == -1) || (regno == regi)) { from = (char *) ®isters[REGISTER_BYTE (regi)]; to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); memcpy (to, from, REGISTER_RAW_SIZE (regi)); } } if ((regno == -1) || (regno == FCRCS_REGNUM)) fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE (FCRCS_REGNUM)]; } /* Figure out where the longjmp will land. We expect the first arg to be a pointer to the jmp_buf structure from which we extract the pc (_JB_PC) that we will land at. The pc is copied into PC. This routine returns true on success. */ int get_longjmp_target (CORE_ADDR *pc) { char *buf; CORE_ADDR jb_addr; buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); jb_addr = read_register (A0_REGNUM); if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) return 0; *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); return 1; }