X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Flibunwind-frame.c;h=b1896dc9fca668eb93385c9b03223cfc662c3ee7;hb=2bd7c093f663139ad9e57ddc748ade12f6bfbe01;hp=5f9ec3c7c2525e3925082e1fcf1e7205bafa8938;hpb=8cff2ae624d212cd2377b9c36ddb052af0e3f6e8;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/libunwind-frame.c b/gdb/libunwind-frame.c index 5f9ec3c7c2..b1896dc9fc 100644 --- a/gdb/libunwind-frame.c +++ b/gdb/libunwind-frame.c @@ -1,6 +1,7 @@ /* Frame unwinder for frames using the libunwind library. - Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009 + Free Software Foundation, Inc. Written by Jeff Johnston, contributed by Red Hat Inc. @@ -66,9 +67,9 @@ struct libunwind_frame_cache unw_addr_space_t as; }; -/* We need to qualify the function names with a platform-specific prefix to match - the names used by the libunwind library. The UNW_OBJ macro is provided by the - libunwind.h header file. */ +/* We need to qualify the function names with a platform-specific prefix + to match the names used by the libunwind library. The UNW_OBJ macro is + provided by the libunwind.h header file. */ #define STRINGIFY2(name) #name #define STRINGIFY(name) STRINGIFY2(name) @@ -128,7 +129,7 @@ libunwind_frame_set_descr (struct gdbarch *gdbarch, struct libunwind_descr *desc } static struct libunwind_frame_cache * -libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) +libunwind_frame_cache (struct frame_info *this_frame, void **this_cache) { unw_accessors_t *acc; unw_addr_space_t as; @@ -136,7 +137,7 @@ libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) unw_regnum_t uw_sp_regnum; struct libunwind_frame_cache *cache; struct libunwind_descr *descr; - struct gdbarch *gdbarch = get_frame_arch (next_frame); + struct gdbarch *gdbarch = get_frame_arch (this_frame); int i, ret; if (*this_cache) @@ -148,20 +149,23 @@ libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) /* We can assume we are unwinding a normal frame. Even if this is for a signal trampoline, ia64 signal "trampolines" use a normal subroutine call to start the signal handler. */ - cache->func_addr = frame_func_unwind (next_frame, NORMAL_FRAME); + cache->func_addr = get_frame_func (this_frame); if (cache->func_addr == 0 - && frame_relative_level (next_frame) > 0 - && get_frame_type (next_frame) != SIGTRAMP_FRAME) + && get_next_frame (this_frame) + && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME) return NULL; - /* Get a libunwind cursor to the previous frame. We do this by initializing - a cursor. Libunwind treats a new cursor as the top of stack and will get - the current register set via the libunwind register accessor. Now, we - provide the platform-specific accessors and we set up the register accessor to use - the frame register unwinding interfaces so that we properly get the registers for - the current frame rather than the top. We then use the unw_step function to - move the libunwind cursor back one frame. We can later use this cursor to find previous - registers via the unw_get_reg interface which will invoke libunwind's special logic. */ + /* Get a libunwind cursor to the previous frame. + + We do this by initializing a cursor. Libunwind treats a new cursor + as the top of stack and will get the current register set via the + libunwind register accessor. Now, we provide the platform-specific + accessors and we set up the register accessor to use the frame + register unwinding interfaces so that we properly get the registers + for the current frame rather than the top. We then use the unw_step + function to move the libunwind cursor back one frame. We can later + use this cursor to find previous registers via the unw_get_reg + interface which will invoke libunwind's special logic. */ descr = libunwind_descr (gdbarch); acc = descr->accessors; as = unw_create_addr_space_p (acc, @@ -170,7 +174,7 @@ libunwind_frame_cache (struct frame_info *next_frame, void **this_cache) ? __BIG_ENDIAN : __LITTLE_ENDIAN); - unw_init_remote_p (&cache->cursor, as, next_frame); + unw_init_remote_p (&cache->cursor, as, this_frame); if (unw_step_p (&cache->cursor) < 0) { unw_destroy_addr_space_p (as); @@ -213,27 +217,28 @@ static const struct frame_unwind libunwind_frame_unwind = libunwind_frame_this_id, libunwind_frame_prev_register, NULL, - NULL, - NULL, - libunwind_frame_dealloc_cache + libunwind_frame_sniffer, + libunwind_frame_dealloc_cache, }; /* Verify if there is sufficient libunwind information for the frame to use libunwind frame unwinding. */ -const struct frame_unwind * -libunwind_frame_sniffer (struct frame_info *next_frame) +int +libunwind_frame_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, void **this_cache) { unw_cursor_t cursor; unw_accessors_t *acc; unw_addr_space_t as; struct libunwind_descr *descr; - struct gdbarch *gdbarch = get_frame_arch (next_frame); + struct gdbarch *gdbarch = get_frame_arch (this_frame); int i, ret; - /* To test for libunwind unwind support, initialize a cursor to the current frame and try to back - up. We use this same method when setting up the frame cache (see libunwind_frame_cache()). - If libunwind returns success for this operation, it means that it has found sufficient - libunwind unwinding information to do so. */ + /* To test for libunwind unwind support, initialize a cursor to + the current frame and try to back up. We use this same method + when setting up the frame cache (see libunwind_frame_cache()). + If libunwind returns success for this operation, it means that + it has found sufficient libunwind unwinding information to do so. */ descr = libunwind_descr (gdbarch); acc = descr->accessors; @@ -243,12 +248,12 @@ libunwind_frame_sniffer (struct frame_info *next_frame) ? __BIG_ENDIAN : __LITTLE_ENDIAN); - ret = unw_init_remote_p (&cursor, as, next_frame); + ret = unw_init_remote_p (&cursor, as, this_frame); if (ret < 0) { unw_destroy_addr_space_p (as); - return NULL; + return 0; } @@ -259,17 +264,17 @@ libunwind_frame_sniffer (struct frame_info *next_frame) unw_destroy_addr_space_p (as); if (ret < 0) - return NULL; + return 0; - return &libunwind_frame_unwind; + return 1; } void -libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache, - struct frame_id *this_id) +libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache, + struct frame_id *this_id) { struct libunwind_frame_cache *cache = - libunwind_frame_cache (next_frame, this_cache); + libunwind_frame_cache (this_frame, this_cache); if (cache != NULL) (*this_id) = frame_id_build (cache->base, cache->func_addr); @@ -277,15 +282,13 @@ libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache, (*this_id) = null_frame_id; } -void -libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache, - int regnum, int *optimizedp, - enum lval_type *lvalp, CORE_ADDR *addrp, - int *realnump, gdb_byte *valuep) +struct value * +libunwind_frame_prev_register (struct frame_info *this_frame, + void **this_cache, int regnum) { struct libunwind_frame_cache *cache = - libunwind_frame_cache (next_frame, this_cache); - struct gdbarch *gdbarch = get_frame_arch (next_frame); + libunwind_frame_cache (this_frame, this_cache); + struct gdbarch *gdbarch = get_frame_arch (this_frame); void *ptr; unw_cursor_t *c; @@ -295,12 +298,13 @@ libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache, unw_fpreg_t fpval; unw_regnum_t uw_regnum; struct libunwind_descr *descr; + struct value *val = NULL; if (cache == NULL) - return; + return frame_unwind_got_constant (this_frame, regnum, 0); /* Convert from gdb register number to libunwind register number. */ - descr = libunwind_descr (get_frame_arch (next_frame)); + descr = libunwind_descr (get_frame_arch (this_frame)); uw_regnum = descr->gdb2uw (regnum); gdb_assert (regnum >= 0); @@ -308,63 +312,55 @@ libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache, if (!target_has_registers) error (_("No registers.")); - *optimizedp = 0; - *addrp = 0; - *lvalp = not_lval; - *realnump = -1; - - if (valuep) - memset (valuep, 0, register_size (gdbarch, regnum)); - if (uw_regnum < 0) - return; - - /* To get the previous register, we use the libunwind register APIs with - the cursor we have already pushed back to the previous frame. */ - - if (descr->is_fpreg (uw_regnum)) - { - ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); - ptr = &fpval; - } - else - { - ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); - ptr = &intval; - } - - if (ret < 0) - return; - - if (valuep) - memcpy (valuep, ptr, register_size (gdbarch, regnum)); + return frame_unwind_got_constant (this_frame, regnum, 0); if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0) - return; + return frame_unwind_got_constant (this_frame, regnum, 0); switch (sl.type) { - case UNW_SLT_NONE: - *optimizedp = 1; - break; - case UNW_SLT_MEMORY: - *lvalp = lval_memory; - *addrp = sl.u.addr; + val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr); break; case UNW_SLT_REG: - *lvalp = lval_register; - *realnump = regnum; + val = frame_unwind_got_register (this_frame, regnum, + descr->uw2gdb (sl.u.regnum)); break; + case UNW_SLT_NONE: + { + /* The register is not stored at a specific memory address nor + inside another register. So use libunwind to fetch the register + value for us, and create a constant value with the result. */ + if (descr->is_fpreg (uw_regnum)) + { + ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval); + if (ret < 0) + return frame_unwind_got_constant (this_frame, regnum, 0); + val = frame_unwind_got_bytes (this_frame, regnum, + (gdb_byte *) &fpval); + } + else + { + ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval); + if (ret < 0) + return frame_unwind_got_constant (this_frame, regnum, 0); + val = frame_unwind_got_constant (this_frame, regnum, intval); + } + set_value_optimized_out (val, 1); + break; + } } + + return val; } CORE_ADDR -libunwind_frame_base_address (struct frame_info *next_frame, void **this_cache) +libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache) { struct libunwind_frame_cache *cache = - libunwind_frame_cache (next_frame, this_cache); + libunwind_frame_cache (this_frame, this_cache); if (cache == NULL) return (CORE_ADDR)NULL; @@ -382,14 +378,16 @@ libunwind_search_unwind_table (void *as, long ip, void *di, } /* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */ -const struct frame_unwind * -libunwind_sigtramp_frame_sniffer (struct frame_info *next_frame) +int +libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self, + struct frame_info *this_frame, + void **this_cache) { unw_cursor_t cursor; unw_accessors_t *acc; unw_addr_space_t as; struct libunwind_descr *descr; - struct gdbarch *gdbarch = get_frame_arch (next_frame); + struct gdbarch *gdbarch = get_frame_arch (this_frame); int i, ret; /* To test for libunwind unwind support, initialize a cursor to the @@ -407,21 +405,21 @@ libunwind_sigtramp_frame_sniffer (struct frame_info *next_frame) ? __BIG_ENDIAN : __LITTLE_ENDIAN); - ret = unw_init_remote_p (&cursor, as, next_frame); + ret = unw_init_remote_p (&cursor, as, this_frame); if (ret < 0) { unw_destroy_addr_space_p (as); - return NULL; + return 0; } /* Check to see if we are in a signal frame. */ ret = unw_is_signal_frame_p (&cursor); unw_destroy_addr_space_p (as); if (ret > 0) - return &libunwind_frame_unwind; + return 1; - return NULL; + return 0; } /* The following routine is for accessing special registers of the top frame.