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 #include "genesis/code.h"
26 #include "genesis/fdefn.h"
28 #define REAL_LRA_SLOT 0
29 #if !(defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64))
30 #define KNOWN_RETURN_P_SLOT 1
31 #define BOGUS_LRA_CONSTANTS 2
33 #define KNOWN_RETURN_P_SLOT 2
34 #define BOGUS_LRA_CONSTANTS 3
37 static void *compute_pc(lispobj code_obj
, int pc_offset
)
41 code
= (struct code
*)native_pointer(code_obj
);
42 return (void *)((char *)code
+ HeaderValue(code
->header
)*sizeof(lispobj
)
46 unsigned int breakpoint_install(lispobj code_obj
, int pc_offset
)
48 return arch_install_breakpoint(compute_pc(code_obj
, pc_offset
));
51 void breakpoint_remove(lispobj code_obj
, int pc_offset
,
52 unsigned int orig_inst
)
54 arch_remove_breakpoint(compute_pc(code_obj
, pc_offset
), orig_inst
);
57 void breakpoint_do_displaced_inst(os_context_t
* context
,
58 unsigned int orig_inst
)
60 /* on platforms with sigreturn(), we go directly back from
61 * arch_do_displaced_inst() to lisp code, so we need to clean up
62 * our bindings now. (side note: I'd love to know in exactly what
63 * scenario the speed of breakpoint handling is critical enough to
64 * justify this maintenance mess)
68 #if (defined(LISP_FEATURE_SPARC) && defined (solaris))
69 undo_fake_foreign_function_call(context
);
71 arch_do_displaced_inst(context
, orig_inst
);
74 static lispobj
find_code(os_context_t
*context
)
77 lispobj code
= *os_context_register_addr(context
, reg_CODE
);
80 if (lowtag_of(code
) != OTHER_POINTER_LOWTAG
)
83 header
= *(lispobj
*)(code
-OTHER_POINTER_LOWTAG
);
85 if (widetag_of(header
) == CODE_HEADER_WIDETAG
)
88 return code
- HeaderValue(header
)*sizeof(lispobj
);
91 (lispobj
)component_ptr_from_pc((lispobj
*)(*os_context_pc_addr(context
)));
96 return codeptr
+ OTHER_POINTER_LOWTAG
;
100 static long compute_offset(os_context_t
*context
, lispobj code
)
105 unsigned long code_start
;
106 struct code
*codeptr
= (struct code
*)native_pointer(code
);
108 unsigned long pc
= *os_context_pc_addr(context
) & ~3;
110 unsigned long pc
= *os_context_pc_addr(context
);
113 code_start
= (unsigned long)codeptr
114 + HeaderValue(codeptr
->header
)*sizeof(lispobj
);
118 long offset
= pc
- code_start
;
119 if (offset
>= codeptr
->code_size
)
122 return make_fixnum(offset
);
127 void handle_breakpoint(os_context_t
*context
)
129 lispobj code
, context_sap
;
131 fake_foreign_function_call(context
);
133 context_sap
= alloc_sap(context
);
134 code
= find_code(context
);
136 #ifndef LISP_FEATURE_WIN32
137 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
138 * use debugger breakpoints anywhere in here. */
139 thread_sigmask(SIG_SETMASK
, os_context_sigmask_addr(context
), 0);
142 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
143 compute_offset(context
, code
),
147 undo_fake_foreign_function_call(context
);
150 void *handle_fun_end_breakpoint(os_context_t
*context
)
152 lispobj code
, context_sap
, lra
;
153 struct code
*codeptr
;
155 fake_foreign_function_call(context
);
157 context_sap
= alloc_sap(context
);
158 code
= find_code(context
);
159 codeptr
= (struct code
*)native_pointer(code
);
161 #ifndef LISP_FEATURE_WIN32
162 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
163 * use debugger breakpoints anywhere in here. */
164 thread_sigmask(SIG_SETMASK
, os_context_sigmask_addr(context
), 0);
167 funcall3(SymbolFunction(HANDLE_BREAKPOINT
),
168 compute_offset(context
, code
),
172 lra
= codeptr
->constants
[REAL_LRA_SLOT
];
175 if (codeptr
->constants
[KNOWN_RETURN_P_SLOT
] == NIL
)
176 *os_context_register_addr(context
, reg_CODE
) = lra
;
179 undo_fake_foreign_function_call(context
);
182 return (void *)(lra
-OTHER_POINTER_LOWTAG
+sizeof(lispobj
));
184 return compute_pc(lra
, fixnum_value(codeptr
->constants
[REAL_LRA_SLOT
+1]));
189 handle_single_step_trap (os_context_t
*context
, int kind
, int register_offset
)
191 fake_foreign_function_call(context
);
193 #ifndef LISP_FEATURE_WIN32
194 thread_sigmask(SIG_SETMASK
, os_context_sigmask_addr(context
), 0);
197 funcall2(SymbolFunction(HANDLE_SINGLE_STEP_TRAP
),
199 make_fixnum(register_offset
));
201 undo_fake_foreign_function_call(context
); /* blocks signals again */