| 1 | /* Low level Alpha interface, for GDB when running native. |
| 2 | Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "target.h" |
| 24 | #include <sys/ptrace.h> |
| 25 | #include <machine/reg.h> |
| 26 | |
| 27 | /* Size of elements in jmpbuf */ |
| 28 | |
| 29 | #define JB_ELEMENT_SIZE 8 |
| 30 | |
| 31 | /* The definition for JB_PC in machine/reg.h is wrong. |
| 32 | And we can't get at the correct definition in setjmp.h as it is |
| 33 | not always available (eg. if _POSIX_SOURCE is defined which is the |
| 34 | default). As the defintion is unlikely to change (see comment |
| 35 | in <setjmp.h>, define the correct value here. */ |
| 36 | |
| 37 | #undef JB_PC |
| 38 | #define JB_PC 2 |
| 39 | |
| 40 | /* Figure out where the longjmp will land. |
| 41 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 42 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 43 | This routine returns true on success. */ |
| 44 | |
| 45 | int |
| 46 | get_longjmp_target (pc) |
| 47 | CORE_ADDR *pc; |
| 48 | { |
| 49 | CORE_ADDR jb_addr; |
| 50 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 51 | |
| 52 | jb_addr = read_register(A0_REGNUM); |
| 53 | |
| 54 | if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer, |
| 55 | sizeof(CORE_ADDR))) |
| 56 | return 0; |
| 57 | |
| 58 | *pc = extract_address (raw_buffer, sizeof(CORE_ADDR)); |
| 59 | return 1; |
| 60 | } |
| 61 | |
| 62 | /* Extract the register values out of the core file and store |
| 63 | them where `read_register' will find them. |
| 64 | |
| 65 | CORE_REG_SECT points to the register values themselves, read into memory. |
| 66 | CORE_REG_SIZE is the size of that area. |
| 67 | WHICH says which set of registers we are handling (0 = int, 2 = float |
| 68 | on machines where they are discontiguous). |
| 69 | REG_ADDR is the offset from u.u_ar0 to the register values relative to |
| 70 | core_reg_sect. This is used with old-fashioned core files to |
| 71 | locate the registers in a large upage-plus-stack ".reg" section. |
| 72 | Original upage address X is at location core_reg_sect+x+reg_addr. |
| 73 | */ |
| 74 | |
| 75 | void |
| 76 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 77 | char *core_reg_sect; |
| 78 | unsigned core_reg_size; |
| 79 | int which; |
| 80 | unsigned reg_addr; |
| 81 | { |
| 82 | register int regno; |
| 83 | register int addr; |
| 84 | int bad_reg = -1; |
| 85 | |
| 86 | /* Table to map a gdb regnum to an index in the core register section. |
| 87 | The floating point register values are garbage in OSF/1.2 core files. */ |
| 88 | static int core_reg_mapping[NUM_REGS] = |
| 89 | { |
| 90 | #define EFL (EF_SIZE / 8) |
| 91 | EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6, |
| 92 | EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6, |
| 93 | EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9, |
| 94 | EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1, |
| 95 | EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7, |
| 96 | EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15, |
| 97 | EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23, |
| 98 | EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31, |
| 99 | EF_PC, -1 |
| 100 | }; |
| 101 | static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0}; |
| 102 | |
| 103 | for (regno = 0; regno < NUM_REGS; regno++) |
| 104 | { |
| 105 | if (CANNOT_FETCH_REGISTER (regno)) |
| 106 | { |
| 107 | supply_register (regno, zerobuf); |
| 108 | continue; |
| 109 | } |
| 110 | addr = 8 * core_reg_mapping[regno]; |
| 111 | if (addr < 0 || addr >= core_reg_size) |
| 112 | { |
| 113 | if (bad_reg < 0) |
| 114 | bad_reg = regno; |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | supply_register (regno, core_reg_sect + addr); |
| 119 | } |
| 120 | } |
| 121 | if (bad_reg >= 0) |
| 122 | { |
| 123 | error ("Register %s not found in core file.", reg_names[bad_reg]); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /* Map gdb internal register number to a ptrace ``address''. |
| 128 | These ``addresses'' are defined in <sys/ptrace.h> */ |
| 129 | |
| 130 | #define REGISTER_PTRACE_ADDR(regno) \ |
| 131 | (regno < FP0_REGNUM ? GPR_BASE + (regno) \ |
| 132 | : regno == PC_REGNUM ? PC \ |
| 133 | : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \ |
| 134 | : 0) |
| 135 | |
| 136 | /* Return the ptrace ``address'' of register REGNO. */ |
| 137 | |
| 138 | unsigned int |
| 139 | register_addr (regno, blockend) |
| 140 | int regno; |
| 141 | int blockend; |
| 142 | { |
| 143 | return REGISTER_PTRACE_ADDR (regno); |
| 144 | } |