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a0f267c7 AC |
1 | /* Traditional frame unwind support, for GDB the GNU Debugger. |
2 | ||
3 | Copyright 2003 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "trad-frame.h" | |
25 | #include "regcache.h" | |
26 | ||
27 | /* A traditional frame is unwound by analysing the function prologue | |
28 | and using the information gathered to track registers. For | |
29 | non-optimized frames, the technique is reliable (just need to check | |
30 | for all potential instruction sequences). */ | |
31 | ||
8983bd83 | 32 | struct trad_frame_saved_reg * |
a0f267c7 AC |
33 | trad_frame_alloc_saved_regs (struct frame_info *next_frame) |
34 | { | |
8983bd83 | 35 | int regnum; |
a0f267c7 AC |
36 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
37 | int numregs = NUM_REGS + NUM_PSEUDO_REGS; | |
8983bd83 AC |
38 | struct trad_frame_saved_reg *this_saved_regs |
39 | = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg); | |
40 | for (regnum = 0; regnum < numregs; regnum++) | |
41 | this_saved_regs[regnum].realnum = regnum; | |
a0f267c7 AC |
42 | return this_saved_regs; |
43 | } | |
44 | ||
45 | void | |
8983bd83 | 46 | trad_frame_register_value (struct trad_frame_saved_reg this_saved_regs[], |
a0f267c7 AC |
47 | int regnum, LONGEST val) |
48 | { | |
8983bd83 | 49 | /* Make the REALNUM invalid, indicating that the ADDR contains the |
a0f267c7 | 50 | register's value. */ |
8983bd83 | 51 | this_saved_regs[regnum].realnum = -1; |
a0f267c7 AC |
52 | this_saved_regs[regnum].addr = val; |
53 | } | |
54 | ||
55 | void | |
56 | trad_frame_prev_register (struct frame_info *next_frame, | |
8983bd83 | 57 | struct trad_frame_saved_reg this_saved_regs[], |
a0f267c7 AC |
58 | int regnum, int *optimizedp, |
59 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60 | int *realnump, void *bufferp) | |
61 | { | |
62 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
8983bd83 | 63 | if (this_saved_regs[regnum].realnum >= 0 |
a0f267c7 AC |
64 | && this_saved_regs[regnum].addr != 0) |
65 | { | |
8983bd83 | 66 | /* The register was saved in memory. */ |
a0f267c7 AC |
67 | *optimizedp = 0; |
68 | *lvalp = lval_memory; | |
69 | *addrp = this_saved_regs[regnum].addr; | |
70 | *realnump = -1; | |
71 | if (bufferp != NULL) | |
72 | { | |
73 | /* Read the value in from memory. */ | |
74 | get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp, | |
75 | register_size (gdbarch, regnum)); | |
76 | } | |
77 | } | |
8983bd83 | 78 | else if (this_saved_regs[regnum].realnum >= 0 |
a0f267c7 AC |
79 | && this_saved_regs[regnum].addr == 0) |
80 | { | |
81 | /* As the next frame to return the value of the register. */ | |
8983bd83 | 82 | frame_register_unwind (next_frame, this_saved_regs[regnum].realnum, |
a0f267c7 AC |
83 | optimizedp, lvalp, addrp, realnump, bufferp); |
84 | } | |
85 | else | |
86 | { | |
87 | /* The register's value is available. */ | |
88 | *optimizedp = 0; | |
89 | *lvalp = not_lval; | |
90 | *addrp = 0; | |
91 | *realnump = -1; | |
92 | if (bufferp != NULL) | |
93 | store_unsigned_integer (bufferp, register_size (gdbarch, regnum), | |
94 | this_saved_regs[regnum].addr); | |
95 | } | |
96 | } |