| 1 | /* Data structures and functions associated with agent expressions in GDB. |
| 2 | Copyright (C) 2009-2015 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #if !defined (AX_H) |
| 20 | #define AX_H 1 |
| 21 | |
| 22 | #include "regcache.h" |
| 23 | |
| 24 | #ifdef IN_PROCESS_AGENT |
| 25 | extern int debug_agent; |
| 26 | #define debug_threads debug_agent |
| 27 | #endif |
| 28 | |
| 29 | struct traceframe; |
| 30 | |
| 31 | /* Enumeration of the different kinds of things that can happen during |
| 32 | agent expression evaluation. */ |
| 33 | |
| 34 | enum eval_result_type |
| 35 | { |
| 36 | expr_eval_no_error, |
| 37 | expr_eval_empty_expression, |
| 38 | expr_eval_empty_stack, |
| 39 | expr_eval_stack_overflow, |
| 40 | expr_eval_stack_underflow, |
| 41 | expr_eval_unhandled_opcode, |
| 42 | expr_eval_unrecognized_opcode, |
| 43 | expr_eval_divide_by_zero, |
| 44 | expr_eval_invalid_goto |
| 45 | }; |
| 46 | |
| 47 | struct agent_expr |
| 48 | { |
| 49 | int length; |
| 50 | |
| 51 | unsigned char *bytes; |
| 52 | }; |
| 53 | |
| 54 | #ifndef IN_PROCESS_AGENT |
| 55 | |
| 56 | /* The packet form of an agent expression consists of an 'X', number |
| 57 | of bytes in expression, a comma, and then the bytes. */ |
| 58 | struct agent_expr *gdb_parse_agent_expr (char **actparm); |
| 59 | |
| 60 | /* Release an agent expression. */ |
| 61 | void gdb_free_agent_expr (struct agent_expr *aexpr); |
| 62 | |
| 63 | /* Convert the bytes of an agent expression back into hex digits, so |
| 64 | they can be printed or uploaded. This allocates the buffer, |
| 65 | callers should free when they are done with it. */ |
| 66 | char *gdb_unparse_agent_expr (struct agent_expr *aexpr); |
| 67 | void emit_prologue (void); |
| 68 | void emit_epilogue (void); |
| 69 | enum eval_result_type compile_bytecodes (struct agent_expr *aexpr); |
| 70 | #endif |
| 71 | |
| 72 | /* The context when evaluating agent expression. */ |
| 73 | |
| 74 | struct eval_agent_expr_context |
| 75 | { |
| 76 | /* The registers when evaluating agent expression. */ |
| 77 | struct regcache *regcache; |
| 78 | /* The traceframe, if any, when evaluating agent expression. */ |
| 79 | struct traceframe *tframe; |
| 80 | /* The tracepoint, if any, when evaluating agent expression. */ |
| 81 | struct tracepoint *tpoint; |
| 82 | }; |
| 83 | |
| 84 | enum eval_result_type |
| 85 | gdb_eval_agent_expr (struct eval_agent_expr_context *ctx, |
| 86 | struct agent_expr *aexpr, |
| 87 | ULONGEST *rslt); |
| 88 | |
| 89 | /* Bytecode compilation function vector. */ |
| 90 | |
| 91 | struct emit_ops |
| 92 | { |
| 93 | void (*emit_prologue) (void); |
| 94 | void (*emit_epilogue) (void); |
| 95 | void (*emit_add) (void); |
| 96 | void (*emit_sub) (void); |
| 97 | void (*emit_mul) (void); |
| 98 | void (*emit_lsh) (void); |
| 99 | void (*emit_rsh_signed) (void); |
| 100 | void (*emit_rsh_unsigned) (void); |
| 101 | void (*emit_ext) (int arg); |
| 102 | void (*emit_log_not) (void); |
| 103 | void (*emit_bit_and) (void); |
| 104 | void (*emit_bit_or) (void); |
| 105 | void (*emit_bit_xor) (void); |
| 106 | void (*emit_bit_not) (void); |
| 107 | void (*emit_equal) (void); |
| 108 | void (*emit_less_signed) (void); |
| 109 | void (*emit_less_unsigned) (void); |
| 110 | void (*emit_ref) (int size); |
| 111 | void (*emit_if_goto) (int *offset_p, int *size_p); |
| 112 | void (*emit_goto) (int *offset_p, int *size_p); |
| 113 | void (*write_goto_address) (CORE_ADDR from, CORE_ADDR to, int size); |
| 114 | void (*emit_const) (LONGEST num); |
| 115 | void (*emit_call) (CORE_ADDR fn); |
| 116 | void (*emit_reg) (int reg); |
| 117 | void (*emit_pop) (void); |
| 118 | void (*emit_stack_flush) (void); |
| 119 | void (*emit_zero_ext) (int arg); |
| 120 | void (*emit_swap) (void); |
| 121 | void (*emit_stack_adjust) (int n); |
| 122 | |
| 123 | /* Emit code for a generic function that takes one fixed integer |
| 124 | argument and returns a 64-bit int (for instance, tsv getter). */ |
| 125 | void (*emit_int_call_1) (CORE_ADDR fn, int arg1); |
| 126 | |
| 127 | /* Emit code for a generic function that takes one fixed integer |
| 128 | argument and a 64-bit int from the top of the stack, and returns |
| 129 | nothing (for instance, tsv setter). */ |
| 130 | void (*emit_void_call_2) (CORE_ADDR fn, int arg1); |
| 131 | |
| 132 | /* Emit code specialized for common combinations of compare followed |
| 133 | by a goto. */ |
| 134 | void (*emit_eq_goto) (int *offset_p, int *size_p); |
| 135 | void (*emit_ne_goto) (int *offset_p, int *size_p); |
| 136 | void (*emit_lt_goto) (int *offset_p, int *size_p); |
| 137 | void (*emit_le_goto) (int *offset_p, int *size_p); |
| 138 | void (*emit_gt_goto) (int *offset_p, int *size_p); |
| 139 | void (*emit_ge_goto) (int *offset_p, int *size_p); |
| 140 | }; |
| 141 | |
| 142 | extern CORE_ADDR current_insn_ptr; |
| 143 | extern int emit_error; |
| 144 | |
| 145 | #endif /* AX_H */ |