1 /* Native support for MIPS running SVR4, for GDB.
2 Copyright 1994, 1995 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
26 #include <sys/procfs.h>
27 #include <setjmp.h> /* For JB_XXX. */
29 /* Size of elements in jmpbuf */
31 #define JB_ELEMENT_SIZE 4
34 * See the comment in m68k-tdep.c regarding the utility of these functions.
36 * These definitions are from the MIPS SVR4 ABI, so they may work for
37 * any MIPS SVR4 target.
41 supply_gregset (gregsetp)
45 register greg_t *regp = &(*gregsetp)[0];
46 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
48 for (regi = 0; regi <= CXT_RA; regi++)
49 supply_register (regi, (char *)(regp + regi));
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));
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 for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
61 supply_register (regi, zerobuf);
65 fill_gregset (gregsetp, regno)
70 register greg_t *regp = &(*gregsetp)[0];
72 for (regi = 0; regi <= 32; regi++)
73 if ((regno == -1) || (regno == regi))
74 *(regp + regi) = *(greg_t *) ®isters[REGISTER_BYTE (regi)];
76 if ((regno == -1) || (regno == PC_REGNUM))
77 *(regp + CXT_EPC) = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)];
79 if ((regno == -1) || (regno == CAUSE_REGNUM))
80 *(regp + CXT_CAUSE) = *(greg_t *) ®isters[REGISTER_BYTE (CAUSE_REGNUM)];
82 if ((regno == -1) || (regno == HI_REGNUM))
83 *(regp + CXT_MDHI) = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)];
85 if ((regno == -1) || (regno == LO_REGNUM))
86 *(regp + CXT_MDLO) = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)];
90 * Now we do the same thing for floating-point registers.
91 * We don't bother to condition on FP0_REGNUM since any
92 * reasonable MIPS configuration has an R3010 in it.
94 * Again, see the comments in m68k-tdep.c.
98 supply_fpregset (fpregsetp)
99 fpregset_t *fpregsetp;
102 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
104 for (regi = 0; regi < 32; regi++)
105 supply_register (FP0_REGNUM + regi,
106 (char *)&fpregsetp->fp_r.fp_regs[regi]);
108 supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr);
110 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
111 supply_register (FCRIR_REGNUM, zerobuf);
115 fill_fpregset (fpregsetp, regno)
116 fpregset_t *fpregsetp;
122 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
124 if ((regno == -1) || (regno == regi))
126 from = (char *) ®isters[REGISTER_BYTE (regi)];
127 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
128 memcpy(to, from, REGISTER_RAW_SIZE (regi));
132 if ((regno == -1) || (regno == FCRCS_REGNUM))
133 fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)];
137 /* Figure out where the longjmp will land.
138 We expect the first arg to be a pointer to the jmp_buf structure from which
139 we extract the pc (_JB_PC) that we will land at. The pc is copied into PC.
140 This routine returns true on success. */
143 get_longjmp_target (pc)
146 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
149 jb_addr = read_register (A0_REGNUM);
151 if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf,
152 TARGET_PTR_BIT / TARGET_CHAR_BIT))
155 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);