diff options
Diffstat (limited to 'gdb/frame.c')
-rw-r--r-- | gdb/frame.c | 92 |
1 files changed, 91 insertions, 1 deletions
diff --git a/gdb/frame.c b/gdb/frame.c index 24cd907..1fd35c2 100644 --- a/gdb/frame.c +++ b/gdb/frame.c @@ -1,4 +1,4 @@ -/* Cache and manage the values of registers for GDB, the GNU debugger. +/* Cache and manage frames for GDB, the GNU debugger. Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001, 2002 Free Software Foundation, Inc. @@ -26,6 +26,7 @@ #include "value.h" #include "inferior.h" /* for inferior_ptid */ #include "regcache.h" +#include "gdb_assert.h" /* FIND_SAVED_REGISTER () @@ -127,6 +128,95 @@ default_get_saved_register (char *raw_buffer, *addrp = addr; } +void +frame_register_unwind (struct frame_info *frame, int regnum, + int *optimizedp, enum lval_type *lvalp, + CORE_ADDR *addrp, int *realnump, void *bufferp) +{ + struct frame_unwind_cache *cache; + + /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates + that the value proper does not need to be fetched. */ + gdb_assert (optimizedp != NULL); + gdb_assert (lvalp != NULL); + gdb_assert (addrp != NULL); + gdb_assert (realnump != NULL); + /* gdb_assert (bufferp != NULL); */ + + /* NOTE: cagney/2002-04-14: It would be nice if, instead of a + special case, there was always an inner frame dedicated to the + hardware registers. Unfortunatly, there is too much unwind code + around that looks up/down the frame chain while making the + assumption that each frame level is using the same unwind code. */ + + if (frame == NULL) + { + /* We're in the inner-most frame, get the value direct from the + register cache. */ + *optimizedp = 0; + *lvalp = lval_register; + *addrp = 0; + /* Should this code test ``register_cached (regnum) < 0'' and do + something like set realnum to -1 when the register isn't + available? */ + *realnump = regnum; + if (bufferp) + read_register_gen (regnum, bufferp); + return; + } + + /* Ask this frame to unwind its register. */ + frame->register_unwind (frame, &frame->register_unwind_cache, regnum, + optimizedp, lvalp, addrp, realnump, bufferp); +} + + +void +generic_unwind_get_saved_register (char *raw_buffer, + int *optimizedp, + CORE_ADDR *addrp, + struct frame_info *frame, + int regnum, + enum lval_type *lvalp) +{ + int optimizedx; + CORE_ADDR addrx; + int realnumx; + enum lval_type lvalx; + + if (!target_has_registers) + error ("No registers."); + + /* Keep things simple, ensure that all the pointers (except valuep) + are non NULL. */ + if (optimizedp == NULL) + optimizedp = &optimizedx; + if (lvalp == NULL) + lvalp = &lvalx; + if (addrp == NULL) + addrp = &addrx; + + /* Reached the the bottom (youngest, inner most) of the frame chain + (youngest, inner most) frame, go direct to the hardware register + cache (do not pass go, do not try to cache the value, ...). The + unwound value would have been cached in frame->next but that + doesn't exist. This doesn't matter as the hardware register + cache is stopping any unnecessary accesses to the target. */ + + /* NOTE: cagney/2002-04-14: It would be nice if, instead of a + special case, there was always an inner frame dedicated to the + hardware registers. Unfortunatly, there is too much unwind code + around that looks up/down the frame chain while making the + assumption that each frame level is using the same unwind code. */ + + if (frame == NULL) + frame_register_unwind (NULL, regnum, optimizedp, lvalp, addrp, &realnumx, + raw_buffer); + else + frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp, + &realnumx, raw_buffer); +} + #if !defined (GET_SAVED_REGISTER) #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \ default_get_saved_register(raw_buffer, optimized, addrp, frame, regnum, lval) |