diff options
Diffstat (limited to 'gdb/hppa-tdep.c')
| -rw-r--r-- | gdb/hppa-tdep.c | 156 |
1 files changed, 129 insertions, 27 deletions
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c index 3ff364c..85c0766 100644 --- a/gdb/hppa-tdep.c +++ b/gdb/hppa-tdep.c @@ -1572,8 +1572,10 @@ pa_print_fp_reg (i) } } -/* Return one if PC is in the call path of a shared library trampoline, else - return zero. */ +/* Return one if PC is in the call path of a trampoline, else return zero. + + Note we return one for *any* call trampoline (long-call, arg-reloc), not + just shared library trampolines (import, export). */ in_solib_call_trampoline (pc, name) CORE_ADDR pc; @@ -1581,6 +1583,33 @@ in_solib_call_trampoline (pc, name) { struct minimal_symbol *minsym; struct unwind_table_entry *u; + static CORE_ADDR dyncall = 0; + static CORE_ADDR sr4export = 0; + +/* FIXME XXX - dyncall and sr4export must be initialized whenever we get a + new exec file */ + + /* First see if PC is in one of the two C-library trampolines. */ + if (!dyncall) + { + minsym = lookup_minimal_symbol ("$$dyncall", NULL); + if (minsym) + dyncall = SYMBOL_VALUE_ADDRESS (minsym); + else + dyncall = -1; + } + + if (!sr4export) + { + minsym = lookup_minimal_symbol ("_sr4export", NULL); + if (minsym) + sr4export = SYMBOL_VALUE_ADDRESS (minsym); + else + sr4export = -1; + } + + if (pc == dyncall || pc == sr4export) + return 1; /* Get the unwind descriptor corresponding to PC, return zero if no unwind was found. */ @@ -1589,31 +1618,69 @@ in_solib_call_trampoline (pc, name) return 0; /* If this isn't a linker stub, then return now. */ - if (u->stub_type != IMPORT - && u->stub_type != EXPORT) + if (u->stub_type == 0) return 0; + /* By definition a long-branch stub is a call stub. */ + if (u->stub_type == LONG_BRANCH) + return 1; + /* The call and return path execute the same instructions within an IMPORT stub! So an IMPORT stub is both a call and return trampoline. */ if (u->stub_type == IMPORT) return 1; - /* The linker may group many EXPORT stubs into one unwind entry. So - lookup the minimal symbol and use that as the beginning of this - particular stub. */ - minsym = lookup_minimal_symbol_by_pc (pc); - if (minsym == NULL) - return 0; + if (u->stub_type == EXPORT) + { + /* The linker may group many EXPORT stubs into one unwind entry. So + lookup the minimal symbol and use that as the beginning of this + particular stub. */ + minsym = lookup_minimal_symbol_by_pc (pc); + if (minsym == NULL) + return 0; - /* Export stubs have distinct call and return paths. The first - two instructions are the call path, following four are the + /* Export stubs have distinct call and return paths. The first + two instructions are the call path, following four are the + return path. */ + return (pc >= SYMBOL_VALUE (minsym) && pc < SYMBOL_VALUE (minsym) + 8); + } + + /* Parameter relocation stubs always have a call path and may have a return path. */ - return (pc >= SYMBOL_VALUE (minsym) && pc < SYMBOL_VALUE (minsym) + 8); + if (u->stub_type == PARAMETER_RELOCATION) + { + CORE_ADDR addr; + + /* Search forward from the current PC until we hit a branch + or the end of the stub. */ + for (addr = pc; addr <= u->region_end; addr += 4) + { + unsigned long insn; + + insn = read_memory_integer (addr, 4); + + /* Does it look like a bl? If so then it's the call path, if + we find a bv first, then we're on the return path. */ + if ((insn & 0xfc00e000) == 0xe8000000) + return 1; + else if ((insn & 0xfc00e001) == 0xe800c000) + return 0; + } + + /* Should never happen. */ + warning ("Unable to find branch in parameter relocation stub.\n"); + return 0; + } + + /* Unknown stub type. For now, just return zero. */ + return 0; } -/* Return one if PC is in the return path of a shared library trampoline, - else return zero. */ +/* Return one if PC is in the return path of a trampoline, else return zero. + + Note we return one for *any* call trampoline (long-call, arg-reloc), not + just shared library trampolines (import, export). */ in_solib_return_trampoline (pc, name) CORE_ADDR pc; @@ -1628,9 +1695,9 @@ in_solib_return_trampoline (pc, name) if (!u) return 0; - /* If this isn't a linker stub, then return now. */ - if (u->stub_type != IMPORT - && u->stub_type != EXPORT) + /* If this isn't a linker stub or it's just a long branch stub, then + return zero. */ + if (u->stub_type == 0 || u->stub_type == LONG_BRANCH) return 0; /* The call and return path execute the same instructions within @@ -1639,17 +1706,52 @@ in_solib_return_trampoline (pc, name) if (u->stub_type == IMPORT) return 1; - /* The linker may group many EXPORT stubs into one unwind entry. So - lookup the minimal symbol and use that as the beginning of this - particular stub. */ - minsym = lookup_minimal_symbol_by_pc (pc); - if (minsym == NULL) - return 0; + if (u->stub_type == EXPORT) + { + /* The linker may group many EXPORT stubs into one unwind entry. So + lookup the minimal symbol and use that as the beginning of this + particular stub. */ + minsym = lookup_minimal_symbol_by_pc (pc); + if (minsym == NULL) + return 0; - /* Export stubs have distinct call and return paths. The first - two instructions are the call path, following four are the + /* Export stubs have distinct call and return paths. The first + two instructions are the call path, following four are the + return path. */ + return (pc >= SYMBOL_VALUE (minsym) + 8 + && pc < SYMBOL_VALUE (minsym) + 20); + } + + /* Parameter relocation stubs always have a call path and may have a return path. */ - return (pc >= SYMBOL_VALUE (minsym) + 8 && pc < SYMBOL_VALUE (minsym) + 20); + if (u->stub_type == PARAMETER_RELOCATION) + { + CORE_ADDR addr; + + /* Search forward from the current PC until we hit a branch + or the end of the stub. */ + for (addr = pc; addr <= u->region_end; addr += 4) + { + unsigned long insn; + + insn = read_memory_integer (addr, 4); + + /* Does it look like a bl? If so then it's the call path, if + we find a bv first, then we're on the return path. */ + if ((insn & 0xfc00e000) == 0xe8000000) + return 0; + else if ((insn & 0xfc00e001) == 0xe800c000) + return 1; + } + + /* Should never happen. */ + warning ("Unable to find branch in parameter relocation stub.\n"); + return 0; + } + + /* Unknown stub type. For now, just return zero. */ + return 0; + } /* Figure out if PC is in a trampoline, and if so find out where |