1 /* Native support for MIPS running SVR4, for GDB.
2 Copyright 1994, 1995, 2000, 2001 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,
19 Boston, MA 02111-1307, USA. */
28 #include <sys/procfs.h>
29 #include <setjmp.h> /* For JB_XXX. */
31 /* Prototypes for supply_gregset etc. */
34 /* Size of elements in jmpbuf */
36 #define JB_ELEMENT_SIZE 4
39 * See the comment in m68k-tdep.c regarding the utility of these functions.
41 * These definitions are from the MIPS SVR4 ABI, so they may work for
42 * any MIPS SVR4 target.
46 supply_gregset (gregset_t *gregsetp)
49 register greg_t *regp = &(*gregsetp)[0];
50 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
53 for (regi = 0; regi <= CXT_RA; regi++)
54 supply_register (regi, (char *) (regp + regi));
56 supply_register (PC_REGNUM, (char *) (regp + CXT_EPC));
57 supply_register (HI_REGNUM, (char *) (regp + CXT_MDHI));
58 supply_register (LO_REGNUM, (char *) (regp + CXT_MDLO));
59 supply_register (CAUSE_REGNUM, (char *) (regp + CXT_CAUSE));
61 /* Fill inaccessible registers with zero. */
62 supply_register (PS_REGNUM, zerobuf);
63 supply_register (BADVADDR_REGNUM, zerobuf);
64 supply_register (FP_REGNUM, zerobuf);
65 supply_register (UNUSED_REGNUM, zerobuf);
66 for (regi = FIRST_EMBED_REGNUM; regi <= LAST_EMBED_REGNUM; regi++)
67 supply_register (regi, zerobuf);
71 fill_gregset (gregset_t *gregsetp, int regno)
74 register greg_t *regp = &(*gregsetp)[0];
76 for (regi = 0; regi <= 32; regi++)
77 if ((regno == -1) || (regno == regi))
78 *(regp + regi) = *(greg_t *) & registers[REGISTER_BYTE (regi)];
80 if ((regno == -1) || (regno == PC_REGNUM))
81 *(regp + CXT_EPC) = *(greg_t *) & registers[REGISTER_BYTE (PC_REGNUM)];
83 if ((regno == -1) || (regno == CAUSE_REGNUM))
84 *(regp + CXT_CAUSE) = *(greg_t *) & registers[REGISTER_BYTE (CAUSE_REGNUM)];
86 if ((regno == -1) || (regno == HI_REGNUM))
87 *(regp + CXT_MDHI) = *(greg_t *) & registers[REGISTER_BYTE (HI_REGNUM)];
89 if ((regno == -1) || (regno == LO_REGNUM))
90 *(regp + CXT_MDLO) = *(greg_t *) & registers[REGISTER_BYTE (LO_REGNUM)];
94 * Now we do the same thing for floating-point registers.
95 * We don't bother to condition on FP0_REGNUM since any
96 * reasonable MIPS configuration has an R3010 in it.
98 * Again, see the comments in m68k-tdep.c.
102 supply_fpregset (fpregset_t *fpregsetp)
105 static char zerobuf[MAX_REGISTER_RAW_SIZE] =
108 for (regi = 0; regi < 32; regi++)
109 supply_register (FP0_REGNUM + regi,
110 (char *) &fpregsetp->fp_r.fp_regs[regi]);
112 supply_register (FCRCS_REGNUM, (char *) &fpregsetp->fp_csr);
114 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
115 supply_register (FCRIR_REGNUM, zerobuf);
119 fill_fpregset (fpregset_t *fpregsetp, int regno)
124 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
126 if ((regno == -1) || (regno == regi))
128 from = (char *) ®isters[REGISTER_BYTE (regi)];
129 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
130 memcpy (to, from, REGISTER_RAW_SIZE (regi));
134 if ((regno == -1) || (regno == FCRCS_REGNUM))
135 fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE (FCRCS_REGNUM)];
139 /* Figure out where the longjmp will land.
140 We expect the first arg to be a pointer to the jmp_buf structure from which
141 we extract the pc (_JB_PC) that we will land at. The pc is copied into PC.
142 This routine returns true on success. */
145 get_longjmp_target (CORE_ADDR *pc)
150 buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
151 jb_addr = read_register (A0_REGNUM);
153 if (target_read_memory (jb_addr + _JB_PC * JB_ELEMENT_SIZE, buf,
154 TARGET_PTR_BIT / TARGET_CHAR_BIT))
157 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);