| 1 | /* Cache and manage the values of registers for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, |
| 4 | 2001, 2002 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #ifndef REGCACHE_H |
| 24 | #define REGCACHE_H |
| 25 | |
| 26 | struct regcache; |
| 27 | struct gdbarch; |
| 28 | |
| 29 | extern struct regcache *current_regcache; |
| 30 | |
| 31 | void regcache_xfree (struct regcache *regcache); |
| 32 | struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache); |
| 33 | struct regcache *regcache_xmalloc (struct gdbarch *gdbarch); |
| 34 | |
| 35 | /* Transfer a raw register [0..NUM_REGS) between core-gdb and the |
| 36 | regcache. */ |
| 37 | |
| 38 | void regcache_raw_read (struct regcache *regcache, int rawnum, void *buf); |
| 39 | void regcache_raw_write (struct regcache *regcache, int rawnum, |
| 40 | const void *buf); |
| 41 | extern void regcache_raw_read_signed (struct regcache *regcache, |
| 42 | int regnum, LONGEST *val); |
| 43 | extern void regcache_raw_read_unsigned (struct regcache *regcache, |
| 44 | int regnum, ULONGEST *val); |
| 45 | extern void regcache_raw_write_signed (struct regcache *regcache, |
| 46 | int regnum, LONGEST val); |
| 47 | extern void regcache_raw_write_unsigned (struct regcache *regcache, |
| 48 | int regnum, ULONGEST val); |
| 49 | |
| 50 | /* Partial transfer of a raw registers. These perform read, modify, |
| 51 | write style operations. */ |
| 52 | |
| 53 | void regcache_raw_read_part (struct regcache *regcache, int regnum, |
| 54 | int offset, int len, void *buf); |
| 55 | void regcache_raw_write_part (struct regcache *regcache, int regnum, |
| 56 | int offset, int len, const void *buf); |
| 57 | |
| 58 | int regcache_valid_p (struct regcache *regcache, int regnum); |
| 59 | |
| 60 | /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */ |
| 61 | void regcache_cooked_read (struct regcache *regcache, int rawnum, void *buf); |
| 62 | void regcache_cooked_write (struct regcache *regcache, int rawnum, |
| 63 | const void *buf); |
| 64 | |
| 65 | /* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism |
| 66 | for indicating when a ``cooked'' register was constructed from |
| 67 | invalid or unavailable ``raw'' registers. One fairly easy way of |
| 68 | adding such a mechanism would be for the cooked functions to return |
| 69 | a register valid indication. Given the possibility of such a |
| 70 | change, the extract functions below use a reference parameter, |
| 71 | rather than a function result. */ |
| 72 | |
| 73 | /* Read a register as a signed/unsigned quantity. */ |
| 74 | extern void regcache_cooked_read_signed (struct regcache *regcache, |
| 75 | int regnum, LONGEST *val); |
| 76 | extern void regcache_cooked_read_unsigned (struct regcache *regcache, |
| 77 | int regnum, ULONGEST *val); |
| 78 | |
| 79 | /* Partial transfer of a cooked register. These perform read, modify, |
| 80 | write style operations. */ |
| 81 | |
| 82 | void regcache_cooked_read_part (struct regcache *regcache, int regnum, |
| 83 | int offset, int len, void *buf); |
| 84 | void regcache_cooked_write_part (struct regcache *regcache, int regnum, |
| 85 | int offset, int len, const void *buf); |
| 86 | |
| 87 | /* Transfer a raw register [0..NUM_REGS) between the regcache and the |
| 88 | target. These functions are called by the target in response to a |
| 89 | target_fetch_registers() or target_store_registers(). */ |
| 90 | |
| 91 | extern void supply_register (int regnum, const void *val); |
| 92 | extern void regcache_collect (int regnum, void *buf); |
| 93 | |
| 94 | |
| 95 | /* The register's ``offset''. |
| 96 | |
| 97 | NOTE: cagney/2002-08-17: The ``struct value'' and expression |
| 98 | evaluator treat the register cache as a large liner buffer. |
| 99 | Instead of reading/writing a register using its register number, |
| 100 | the code read/writes registers by specifying their offset into the |
| 101 | buffer and a number of bytes. The code also assumes that these |
| 102 | byte read/writes can cross register boundaries, adjacent registers |
| 103 | treated as a contiguous set of bytes. |
| 104 | |
| 105 | The below map that model onto the real register cache. New code |
| 106 | should go out of their way to avoid using these interfaces. |
| 107 | |
| 108 | FIXME: cagney/2002-08-17: The ``struct value'' and expression |
| 109 | evaluator should be fixed. Instead of using the { offset, length } |
| 110 | pair to describe a value within one or more registers, the code |
| 111 | should use a chain of { regnum, offset, len } tripples. */ |
| 112 | |
| 113 | extern int register_offset_hack (struct gdbarch *gdbarch, int regnum); |
| 114 | extern void regcache_cooked_read_using_offset_hack (struct regcache *regcache, |
| 115 | int offset, int len, |
| 116 | void *buf); |
| 117 | extern void regcache_cooked_write_using_offset_hack (struct regcache *regcache, |
| 118 | int offset, int len, |
| 119 | const void *buf); |
| 120 | |
| 121 | |
| 122 | /* The type of a register. This function is slightly more efficient |
| 123 | then its gdbarch vector counterpart since it returns a precomputed |
| 124 | value stored in a table. |
| 125 | |
| 126 | NOTE: cagney/2002-08-17: The original macro was called |
| 127 | REGISTER_VIRTUAL_TYPE. This was because the register could have |
| 128 | different raw and cooked (nee virtual) representations. The |
| 129 | CONVERTABLE methods being used to convert between the two |
| 130 | representations. Current code does not do this. Instead, the |
| 131 | first [0..NUM_REGS) registers are 1:1 raw:cooked, and the type |
| 132 | exactly describes the register's representation. Consequently, the |
| 133 | ``virtual'' has been dropped. |
| 134 | |
| 135 | FIXME: cagney/2002-08-17: A number of architectures, including the |
| 136 | MIPS, are currently broken in this regard. */ |
| 137 | |
| 138 | extern struct type *register_type (struct gdbarch *gdbarch, int regnum); |
| 139 | |
| 140 | |
| 141 | /* Return the size of the largest register. Used when allocating |
| 142 | space for an aribtrary register value. */ |
| 143 | |
| 144 | extern int max_register_size (struct gdbarch *gdbarch); |
| 145 | |
| 146 | |
| 147 | /* DEPRECATED: Character array containing an image of the inferior |
| 148 | programs' registers for the most recently referenced thread. */ |
| 149 | |
| 150 | extern char *registers; |
| 151 | |
| 152 | /* DEPRECATED: Character array containing the current state of each |
| 153 | register (unavailable<0, invalid=0, valid>0) for the most recently |
| 154 | referenced thread. */ |
| 155 | |
| 156 | extern signed char *register_valid; |
| 157 | |
| 158 | /* Copy/duplicate the contents of a register cache. By default, the |
| 159 | operation is pass-through. Writes to DST and reads from SRC will |
| 160 | go through to the target. |
| 161 | |
| 162 | The ``cpy'' functions can not have overlapping SRC and DST buffers. |
| 163 | |
| 164 | ``no passthrough'' versions do not go through to the target. They |
| 165 | only transfer values already in the cache. */ |
| 166 | |
| 167 | extern struct regcache *regcache_dup (struct regcache *regcache); |
| 168 | extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache); |
| 169 | extern void regcache_cpy (struct regcache *dest, struct regcache *src); |
| 170 | extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src); |
| 171 | |
| 172 | extern char *deprecated_grub_regcache_for_registers (struct regcache *); |
| 173 | extern char *deprecated_grub_regcache_for_register_valid (struct regcache *); |
| 174 | |
| 175 | extern int register_cached (int regnum); |
| 176 | |
| 177 | extern void set_register_cached (int regnum, int state); |
| 178 | |
| 179 | extern void register_changed (int regnum); |
| 180 | |
| 181 | extern void registers_changed (void); |
| 182 | |
| 183 | extern void registers_fetched (void); |
| 184 | |
| 185 | extern void read_register_bytes (int regbyte, char *myaddr, int len); |
| 186 | |
| 187 | extern void read_register_gen (int regnum, char *myaddr); |
| 188 | |
| 189 | extern void write_register_gen (int regnum, char *myaddr); |
| 190 | |
| 191 | extern void write_register_bytes (int regbyte, char *myaddr, int len); |
| 192 | |
| 193 | /* Rename to read_unsigned_register()? */ |
| 194 | extern ULONGEST read_register (int regnum); |
| 195 | |
| 196 | /* Rename to read_unsigned_register_pid()? */ |
| 197 | extern ULONGEST read_register_pid (int regnum, ptid_t ptid); |
| 198 | |
| 199 | extern LONGEST read_signed_register (int regnum); |
| 200 | |
| 201 | extern LONGEST read_signed_register_pid (int regnum, ptid_t ptid); |
| 202 | |
| 203 | extern void write_register (int regnum, LONGEST val); |
| 204 | |
| 205 | extern void write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid); |
| 206 | |
| 207 | #endif /* REGCACHE_H */ |