1 /* Native support for MIPS running SVR4, for GDB. 2 Copyright 1994, 1995 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 19 20 #include "defs.h" 21 #include "inferior.h" 22 #include "gdbcore.h" 23 #include "target.h" 24 25 #include <sys/time.h> 26 #include <sys/procfs.h> 27 #include <setjmp.h> /* For JB_XXX. */ 28 29 /* Size of elements in jmpbuf */ 30 31 #define JB_ELEMENT_SIZE 4 32 33 /* 34 * See the comment in m68k-tdep.c regarding the utility of these functions. 35 * 36 * These definitions are from the MIPS SVR4 ABI, so they may work for 37 * any MIPS SVR4 target. 38 */ 39 40 void 41 supply_gregset (gregsetp) 42 gregset_t *gregsetp; 43 { 44 register int regi; 45 register greg_t *regp = &(*gregsetp)[0]; 46 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; 47 48 for (regi = 0; regi <= CXT_RA; regi++) 49 supply_register (regi, (char *)(regp + regi)); 50 51 supply_register (PC_REGNUM, (char *)(regp + CXT_EPC)); 52 supply_register (HI_REGNUM, (char *)(regp + CXT_MDHI)); 53 supply_register (LO_REGNUM, (char *)(regp + CXT_MDLO)); 54 supply_register (CAUSE_REGNUM, (char *)(regp + CXT_CAUSE)); 55 56 /* Fill inaccessible registers with zero. */ 57 supply_register (PS_REGNUM, zerobuf); 58 supply_register (BADVADDR_REGNUM, zerobuf); 59 supply_register (FP_REGNUM, zerobuf); 60 supply_register (UNUSED_REGNUM, zerobuf); 61 for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++) 62 supply_register (regi, zerobuf); 63 } 64 65 void 66 fill_gregset (gregsetp, regno) 67 gregset_t *gregsetp; 68 int regno; 69 { 70 int regi; 71 register greg_t *regp = &(*gregsetp)[0]; 72 73 for (regi = 0; regi <= 32; regi++) 74 if ((regno == -1) || (regno == regi)) 75 *(regp + regi) = *(greg_t *) ®isters[REGISTER_BYTE (regi)]; 76 77 if ((regno == -1) || (regno == PC_REGNUM)) 78 *(regp + CXT_EPC) = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)]; 79 80 if ((regno == -1) || (regno == CAUSE_REGNUM)) 81 *(regp + CXT_CAUSE) = *(greg_t *) ®isters[REGISTER_BYTE (CAUSE_REGNUM)]; 82 83 if ((regno == -1) || (regno == HI_REGNUM)) 84 *(regp + CXT_MDHI) = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)]; 85 86 if ((regno == -1) || (regno == LO_REGNUM)) 87 *(regp + CXT_MDLO) = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)]; 88 } 89 90 /* 91 * Now we do the same thing for floating-point registers. 92 * We don't bother to condition on FP0_REGNUM since any 93 * reasonable MIPS configuration has an R3010 in it. 94 * 95 * Again, see the comments in m68k-tdep.c. 96 */ 97 98 void 99 supply_fpregset (fpregsetp) 100 fpregset_t *fpregsetp; 101 { 102 register int regi; 103 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; 104 105 for (regi = 0; regi < 32; regi++) 106 supply_register (FP0_REGNUM + regi, 107 (char *)&fpregsetp->fp_r.fp_regs[regi]); 108 109 supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr); 110 111 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */ 112 supply_register (FCRIR_REGNUM, zerobuf); 113 } 114 115 void 116 fill_fpregset (fpregsetp, regno) 117 fpregset_t *fpregsetp; 118 int regno; 119 { 120 int regi; 121 char *from, *to; 122 123 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) 124 { 125 if ((regno == -1) || (regno == regi)) 126 { 127 from = (char *) ®isters[REGISTER_BYTE (regi)]; 128 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); 129 memcpy(to, from, REGISTER_RAW_SIZE (regi)); 130 } 131 } 132 133 if ((regno == -1) || (regno == FCRCS_REGNUM)) 134 fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)]; 135 } 136 137 138 /* Figure out where the longjmp will land. 139 We expect the first arg to be a pointer to the jmp_buf structure from which 140 we extract the pc (_JB_PC) that we will land at. The pc is copied into PC. 141 This routine returns true on success. */ 142 143 int 144 get_longjmp_target (pc) 145 CORE_ADDR *pc; 146 { 147 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; 148 CORE_ADDR jb_addr; 149 150 jb_addr = read_register (A0_REGNUM); 151 152 if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf, 153 TARGET_PTR_BIT / TARGET_CHAR_BIT)) 154 return 0; 155 156 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); 157 158 return 1; 159 } 160