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c906108c SS |
1 | /* Parameters for target execution on an RS6000, for GDB, the GNU debugger. |
2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1997 | |
3 | Free Software Foundation, Inc. | |
4 | Contributed by IBM Corporation. | |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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. | |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b JM |
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. */ | |
c906108c | 22 | |
7a78ae4e | 23 | #define GDB_MULTI_ARCH 1 |
c906108c SS |
24 | |
25 | /* Minimum possible text address in AIX */ | |
26 | ||
27 | #define TEXT_SEGMENT_BASE 0x10000000 | |
28 | ||
29 | /* Load segment of a given pc value. */ | |
30 | ||
31 | #define PC_LOAD_SEGMENT(PC) pc_load_segment_name(PC) | |
a14ed312 | 32 | extern char *pc_load_segment_name (CORE_ADDR); |
c906108c | 33 | |
c906108c SS |
34 | /* AIX's assembler doesn't grok dollar signs in identifiers. |
35 | So we use dots instead. This item must be coordinated with G++. */ | |
36 | #undef CPLUS_MARKER | |
37 | #define CPLUS_MARKER '.' | |
38 | ||
c906108c SS |
39 | /* If PC is in some function-call trampoline code, return the PC |
40 | where the function itself actually starts. If not, return NULL. */ | |
41 | ||
7a78ae4e ND |
42 | #define SKIP_TRAMPOLINE_CODE(pc) rs6000_skip_trampoline_code (pc) |
43 | extern CORE_ADDR rs6000_skip_trampoline_code (CORE_ADDR); | |
c906108c SS |
44 | |
45 | /* Number of trap signals we need to skip over, once the inferior process | |
46 | starts running. */ | |
47 | ||
48 | #define START_INFERIOR_TRAPS_EXPECTED 2 | |
49 | ||
50 | /* AIX has a couple of strange returns from wait(). */ | |
51 | ||
52 | #define CHILD_SPECIAL_WAITSTATUS(ourstatus, hoststatus) ( \ | |
53 | /* "stop after load" status. */ \ | |
54 | (hoststatus) == 0x57c ? (ourstatus)->kind = TARGET_WAITKIND_LOADED, 1 : \ | |
55 | \ | |
56 | /* signal 0. I have no idea why wait(2) returns with this status word. */ \ | |
57 | /* It looks harmless. */ \ | |
58 | (hoststatus) == 0x7f ? (ourstatus)->kind = TARGET_WAITKIND_SPURIOUS, 1 : \ | |
59 | \ | |
60 | /* A normal waitstatus. Let the usual macros deal with it. */ \ | |
61 | 0) | |
62 | ||
63 | /* In xcoff, we cannot process line numbers when we see them. This is | |
64 | mainly because we don't know the boundaries of the include files. So, | |
65 | we postpone that, and then enter and sort(?) the whole line table at | |
66 | once, when we are closing the current symbol table in end_symtab(). */ | |
67 | ||
68 | #define PROCESS_LINENUMBER_HOOK() aix_process_linenos () | |
a14ed312 | 69 | extern void aix_process_linenos (void); |
c5aa993b | 70 | |
c906108c SS |
71 | /* Register numbers of various important registers. |
72 | Note that some of these values are "real" register numbers, | |
73 | and correspond to the general registers of the machine, | |
74 | and some are "phony" register numbers which are too large | |
75 | to be actual register numbers as far as the user is concerned | |
76 | but do serve to get the desired values when passed to read_register. */ | |
77 | ||
c906108c | 78 | #define FP0_REGNUM 32 /* Floating point register 0 */ |
c5aa993b | 79 | #define FPLAST_REGNUM 63 /* Last floating point register */ |
c906108c | 80 | |
c906108c SS |
81 | /* These #defines are used to parse core files and talk to ptrace, so they |
82 | must remain fixed. */ | |
83 | #define FIRST_UISA_SP_REGNUM 64 /* first special register number */ | |
84 | #define LAST_UISA_SP_REGNUM 70 /* last special register number */ | |
85 | ||
c906108c SS |
86 | /* convert a dbx stab register number (from `r' declaration) to a gdb REGNUM */ |
87 | ||
88 | #define STAB_REG_TO_REGNUM(value) (value) | |
89 | ||
c906108c SS |
90 | /* Define other aspects of the stack frame. */ |
91 | ||
c906108c SS |
92 | #define INIT_FRAME_PC_FIRST(fromleaf, prev) \ |
93 | prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) : \ | |
94 | prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ()); | |
c5aa993b | 95 | #define INIT_FRAME_PC(fromleaf, prev) /* nothing */ |
c906108c SS |
96 | |
97 | /* Usually a function pointer's representation is simply the address | |
98 | of the function. On the RS/6000 however, a function pointer is | |
99 | represented by a pointer to a TOC entry. This TOC entry contains | |
100 | three words, the first word is the address of the function, the | |
101 | second word is the TOC pointer (r2), and the third word is the | |
102 | static chain value. Throughout GDB it is currently assumed that a | |
103 | function pointer contains the address of the function, which is not | |
104 | easy to fix. In addition, the conversion of a function address to | |
105 | a function pointer would require allocation of a TOC entry in the | |
106 | inferior's memory space, with all its drawbacks. To be able to | |
107 | call C++ virtual methods in the inferior (which are called via | |
108 | function pointers), find_function_addr uses this macro to get the | |
109 | function address from a function pointer. */ | |
110 | ||
7a78ae4e ND |
111 | #define CONVERT_FROM_FUNC_PTR_ADDR rs6000_convert_from_func_ptr_addr |
112 | extern CORE_ADDR rs6000_convert_from_func_ptr_addr (CORE_ADDR); | |
c906108c SS |
113 | |
114 | /* Flag for machine-specific stuff in shared files. FIXME */ | |
115 | #define IBM6000_TARGET | |
116 | ||
117 | /* RS6000/AIX does not support PT_STEP. Has to be simulated. */ | |
118 | ||
119 | #define SOFTWARE_SINGLE_STEP_P 1 | |
a14ed312 | 120 | extern void rs6000_software_single_step (unsigned int, int); |
c906108c SS |
121 | #define SOFTWARE_SINGLE_STEP(sig,bp_p) rs6000_software_single_step (sig, bp_p) |
122 | ||
7a78ae4e ND |
123 | /* Notice when a new child process is started. */ |
124 | ||
125 | #define TARGET_CREATE_INFERIOR_HOOK rs6000_create_inferior | |
126 | extern void rs6000_create_inferior (int); | |
127 | ||
128 | /* Hook in rs6000-tdep.c for determining the TOC address when | |
129 | calling functions in the inferior. */ | |
130 | ||
131 | extern CORE_ADDR (*rs6000_find_toc_address_hook) (CORE_ADDR); | |
c906108c | 132 | |
7a78ae4e ND |
133 | /* Hook in rs6000-tdep.c to set the current architecture when starting a |
134 | child process. */ | |
c906108c | 135 | |
7a78ae4e | 136 | extern void (*rs6000_set_host_arch_hook) (int); |