| /* Native support for the SGI Iris running IRIX version 5, for GDB. |
| Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, |
| 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
| Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU |
| and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. |
| Implemented for Irix 4.x by Garrett A. Wollman. |
| Modified for Irix 5.x by Ian Lance Taylor. |
| |
| 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 "gdb_string.h" |
| #include <sys/time.h> |
| #include <sys/procfs.h> |
| #include <setjmp.h> /* For JB_XXX. */ |
| |
| /* Prototypes for supply_gregset etc. */ |
| #include "gregset.h" |
| |
| static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR); |
| |
| /* 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]; |
| int gregoff = sizeof (greg_t) - MIPS_REGSIZE; |
| static char zerobuf[32] = {0}; |
| |
| for (regi = 0; regi <= CTX_RA; regi++) |
| supply_register (regi, (char *) (regp + regi) + gregoff); |
| |
| supply_register (PC_REGNUM, (char *) (regp + CTX_EPC) + gregoff); |
| supply_register (HI_REGNUM, (char *) (regp + CTX_MDHI) + gregoff); |
| supply_register (LO_REGNUM, (char *) (regp + CTX_MDLO) + gregoff); |
| supply_register (CAUSE_REGNUM, (char *) (regp + CTX_CAUSE) + gregoff); |
| |
| /* Fill inaccessible registers with zero. */ |
| supply_register (BADVADDR_REGNUM, zerobuf); |
| } |
| |
| void |
| fill_gregset (gregset_t *gregsetp, int regno) |
| { |
| int regi; |
| register greg_t *regp = &(*gregsetp)[0]; |
| |
| /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32 |
| executable, we have to sign extend the registers to 64 bits before |
| filling in the gregset structure. */ |
| |
| for (regi = 0; regi <= CTX_RA; regi++) |
| if ((regno == -1) || (regno == regi)) |
| *(regp + regi) = |
| extract_signed_integer (®isters[REGISTER_BYTE (regi)], |
| REGISTER_RAW_SIZE (regi)); |
| |
| if ((regno == -1) || (regno == PC_REGNUM)) |
| *(regp + CTX_EPC) = |
| extract_signed_integer (®isters[REGISTER_BYTE (PC_REGNUM)], |
| REGISTER_RAW_SIZE (PC_REGNUM)); |
| |
| if ((regno == -1) || (regno == CAUSE_REGNUM)) |
| *(regp + CTX_CAUSE) = |
| extract_signed_integer (®isters[REGISTER_BYTE (CAUSE_REGNUM)], |
| REGISTER_RAW_SIZE (CAUSE_REGNUM)); |
| |
| if ((regno == -1) || (regno == HI_REGNUM)) |
| *(regp + CTX_MDHI) = |
| extract_signed_integer (®isters[REGISTER_BYTE (HI_REGNUM)], |
| REGISTER_RAW_SIZE (HI_REGNUM)); |
| |
| if ((regno == -1) || (regno == LO_REGNUM)) |
| *(regp + CTX_MDLO) = |
| extract_signed_integer (®isters[REGISTER_BYTE (LO_REGNUM)], |
| REGISTER_RAW_SIZE (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[32] = {0}; |
| |
| /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
| |
| 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? SGI doesn't tell us. */ |
| supply_register (FCRIR_REGNUM, zerobuf); |
| } |
| |
| void |
| fill_fpregset (fpregset_t *fpregsetp, int regno) |
| { |
| int regi; |
| char *from, *to; |
| |
| /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ |
| |
| 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; |
| } |
| |
| /* Provide registers to GDB from a core file. |
| |
| CORE_REG_SECT points to an array of bytes, which were obtained from |
| a core file which BFD thinks might contain register contents. |
| CORE_REG_SIZE is its size. |
| |
| Normally, WHICH says which register set corelow suspects this is: |
| 0 --- the general-purpose register set |
| 2 --- the floating-point register set |
| However, for Irix 5, WHICH isn't used. |
| |
| REG_ADDR is also unused. */ |
| |
| static void |
| fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
| int which, CORE_ADDR reg_addr) |
| { |
| if (core_reg_size == REGISTER_BYTES) |
| { |
| memcpy ((char *) registers, core_reg_sect, core_reg_size); |
| } |
| else if (MIPS_REGSIZE == 4 && |
| core_reg_size == (2 * MIPS_REGSIZE) * NUM_REGS) |
| { |
| /* This is a core file from a N32 executable, 64 bits are saved |
| for all registers. */ |
| char *srcp = core_reg_sect; |
| char *dstp = registers; |
| int regno; |
| |
| for (regno = 0; regno < NUM_REGS; regno++) |
| { |
| if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32)) |
| { |
| /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB |
| currently assumes that they are 32 bit. */ |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| if (REGISTER_RAW_SIZE (regno) == 4) |
| { |
| /* copying 4 bytes from eight bytes? |
| I don't see how this can be right... */ |
| srcp += 4; |
| } |
| else |
| { |
| /* copy all 8 bytes (sizeof(double)) */ |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| } |
| } |
| else |
| { |
| srcp += 4; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| *dstp++ = *srcp++; |
| } |
| } |
| } |
| else |
| { |
| warning ("wrong size gregset struct in core file"); |
| return; |
| } |
| |
| registers_fetched (); |
| } |
| |
| /* Register that we are able to handle irix5 core file formats. |
| This really is bfd_target_unknown_flavour */ |
| |
| static struct core_fns irix5_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_irix5 (void) |
| { |
| add_core_fns (&irix5_core_fns); |
| } |