2 * This software is part of the SBCL system. See the README file for
5 * This software is derived from the CMU CL system, which was
6 * written at Carnegie Mellon University and released into the
7 * public domain. The software is in the public domain and is
8 * provided with absolutely no warranty. See the COPYING and CREDITS
9 * files for more information.
18 #include "interrupt.h"
23 #include "breakpoint.h"
25 #define REAL_LRA_SLOT 0
27 #define KNOWN_RETURN_P_SLOT 1
28 #define BOGUS_LRA_CONSTANTS 2
30 #define KNOWN_RETURN_P_SLOT 2
31 #define BOGUS_LRA_CONSTANTS 3
34 static void *compute_pc(lispobj code_obj
, int pc_offset
)
38 code
= (struct code
*)native_pointer(code_obj
);
39 return (void *)((char *)code
+ HeaderValue(code
->header
)*sizeof(lispobj
)
43 unsigned long breakpoint_install(lispobj code_obj
, int pc_offset
)
45 return arch_install_breakpoint(compute_pc(code_obj
, pc_offset
));
48 void breakpoint_remove(lispobj code_obj
, int pc_offset
,
49 unsigned long orig_inst
)
51 arch_remove_breakpoint(compute_pc(code_obj
, pc_offset
), orig_inst
);
54 void breakpoint_do_displaced_inst(os_context_t
* context
,
55 unsigned long orig_inst
)
57 /* on platforms with sigreturn(), we go directly back from
58 * arch_do_displaced_inst() to lisp code, so we need to clean up
59 * our bindings now. (side note: I'd love to know in exactly what
60 * scenario the speed of breakpoint handling is critical enough to
61 * justify this maintenance mess)
65 #if (defined(sparc) && defined (solaris))
66 undo_fake_foreign_function_call(context
);
68 arch_do_displaced_inst(context
, orig_inst
);
72 static lispobj
find_code(os_context_t
*context
)
75 lispobj code
= *os_context_register_addr(context
, reg_CODE
);
78 if (lowtag_of(code
) != OTHER_POINTER_LOWTAG
)
81 header
= *(lispobj
*)(code
-OTHER_POINTER_LOWTAG
);
83 if (widetag_of(header
) == CODE_HEADER_WIDETAG
)
86 return code
- HeaderValue(header
)*sizeof(lispobj
);
94 static lispobj
find_code(os_context_t
*context
)
97 (lispobj
)component_ptr_from_pc((lispobj
*)(*os_context_pc_addr(context
)));
102 return codeptr
+ OTHER_POINTER_LOWTAG
;
107 static int compute_offset(os_context_t
*context
, lispobj code
)
112 unsigned long code_start
;
113 struct code
*codeptr
= (struct code
*)native_pointer(code
);
115 unsigned long pc
= *os_context_pc_addr(context
) & ~3;
117 unsigned long pc
= *os_context_pc_addr(context
);
120 code_start
= (unsigned long)codeptr
121 + HeaderValue(codeptr
->header
)*sizeof(lispobj
);
125 int offset
= pc
- code_start
;
126 if (offset
>= codeptr
->code_size
)
129 return make_fixnum(offset
);
133 /* FIXME: I can see no really good reason these couldn't be merged, but haven't
134 * tried. The sigprocmask() call would work just as well on alpha as it
135 * presumably does on x86 -dan 2001.08.10
138 void handle_breakpoint(int signal
, siginfo_t
*info
, os_context_t
*context
)
142 fake_foreign_function_call(context
);
144 code
= find_code(context
);
146 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
147 compute_offset(context
, code
),
151 undo_fake_foreign_function_call(context
);
154 void handle_breakpoint(int signal
, siginfo_t
* info
, os_context_t
*context
)
156 lispobj code
, context_sap
= alloc_sap(context
);
158 fake_foreign_function_call(context
);
160 code
= find_code(context
);
162 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
163 * use debugger breakpoints anywhere in here. */
164 sigprocmask(SIG_SETMASK
, os_context_sigmask_addr(context
), 0);
166 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
167 compute_offset(context
, code
),
171 undo_fake_foreign_function_call(context
);
176 void *handle_fun_end_breakpoint(int signal
, siginfo_t
*info
,
177 os_context_t
*context
)
180 struct code
*codeptr
;
182 fake_foreign_function_call(context
);
184 code
= find_code(context
);
185 codeptr
= (struct code
*)native_pointer(code
);
187 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
188 compute_offset(context
, code
),
192 lra
= codeptr
->constants
[REAL_LRA_SLOT
];
194 if (codeptr
->constants
[KNOWN_RETURN_P_SLOT
] == NIL
) {
195 *os_context_register_addr(context
, reg_CODE
) = lra
;
198 undo_fake_foreign_function_call(context
);
199 return (void *)(lra
-OTHER_POINTER_LOWTAG
+sizeof(lispobj
));
202 void *handle_fun_end_breakpoint(int signal
, siginfo_t
*info
,
203 os_context_t
*context
)
205 lispobj code
, context_sap
= alloc_sap(context
);
206 struct code
*codeptr
;
208 fake_foreign_function_call(context
);
210 code
= find_code(context
);
211 codeptr
= (struct code
*)native_pointer(code
);
213 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
214 * use debugger breakpoints anywhere in here. */
215 sigprocmask(SIG_SETMASK
, os_context_sigmask_addr(context
), 0);
217 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
218 compute_offset(context
, code
),
222 undo_fake_foreign_function_call(context
);
224 return compute_pc(codeptr
->constants
[REAL_LRA_SLOT
],
225 fixnum_value(codeptr
->constants
[REAL_LRA_SLOT
+1]));