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);
107 #ifdef LISP_FEATURE_HPPA
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 unsigned long offset = pc - code_start;
119 if (offset >= (N_WORD_BYTES * fixnum_value(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 #ifndef LISP_FEATURE_SB_SAFEPOINT
134 unblock_gc_signals(0, 0);
136 context_sap = alloc_sap(context);
137 code = find_code(context);
139 #ifndef LISP_FEATURE_WIN32
140 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
141 * use debugger breakpoints anywhere in here. */
142 thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
145 funcall3(StaticSymbolFunction(HANDLE_BREAKPOINT),
146 compute_offset(context, code),
150 undo_fake_foreign_function_call(context);
153 void *handle_fun_end_breakpoint(os_context_t *context)
155 lispobj code, context_sap, lra;
156 struct code *codeptr;
158 fake_foreign_function_call(context);
160 #ifndef LISP_FEATURE_SB_SAFEPOINT
161 unblock_gc_signals(0, 0);
163 context_sap = alloc_sap(context);
164 code = find_code(context);
165 codeptr = (struct code *)native_pointer(code);
167 #ifndef LISP_FEATURE_WIN32
168 /* Don't disallow recursive breakpoint traps. Otherwise, we can't
169 * use debugger breakpoints anywhere in here. */
170 thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
173 funcall3(StaticSymbolFunction(HANDLE_BREAKPOINT),
174 compute_offset(context, code),
178 lra = codeptr->constants[REAL_LRA_SLOT];
180 #ifdef LISP_FEATURE_PPC
181 /* PPC now passes LRA objects in reg_LRA during return. Other
182 * platforms should as well, but haven't been fixed yet. */
183 if (codeptr->constants[KNOWN_RETURN_P_SLOT] == NIL)
184 *os_context_register_addr(context, reg_LRA) = lra;
187 if (codeptr->constants[KNOWN_RETURN_P_SLOT] == NIL)
188 *os_context_register_addr(context, reg_CODE) = lra;
192 undo_fake_foreign_function_call(context);
195 return (void *)(lra-OTHER_POINTER_LOWTAG+sizeof(lispobj));
197 return compute_pc(lra, fixnum_value(codeptr->constants[REAL_LRA_SLOT+1]));
202 handle_single_step_trap (os_context_t *context, int kind, int register_offset)
204 fake_foreign_function_call(context);
206 #ifndef LISP_FEATURE_WIN32
207 thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
210 funcall2(StaticSymbolFunction(HANDLE_SINGLE_STEP_TRAP),
212 make_fixnum(register_offset));
214 undo_fake_foreign_function_call(context); /* blocks signals again */