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* config/i386/tm-i386bsd.h (SIGTRAMP_START, SIGTRAMP_END, FRAME_CHAIN,

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FRAMELESS_FUNCTION_INVOCATION, FRAME_SAVED_PC, SIGCONTEXT_PC_OFFSET):
	Define to make backtracing through sigtramp work.
	* config/vax/tm-vax.h (SIGTRAMP_START, SIGTRAMP_END, TARGET_UPAGES,
	FRAME_SAVED_PC, SIGCONTEXT_PC_OFFSET):  Ditto.
This commit is contained in:
Peter Schauer 1993-08-17 08:49:07 +00:00
parent d541211d61
commit 7b98a09136
2 changed files with 59 additions and 24 deletions
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47
gdb/config/i386/tm-i386bsd.h
View File

@ -27,3 +27,50 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* BSDI can't handle them either. */
#undef NUM_REGS
#define NUM_REGS 10
/* On 386 bsd, sigtramp is above the user stack and immediately below
the user area. Using constants here allows for cross debugging.
These are tested for BSDI but should work on 386BSD. */
#define SIGTRAMP_START 0xfdbfdfc0
#define SIGTRAMP_END 0xfdbfe000
/* The following redefines make backtracing through sigtramp work.
They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
from the sigcontext structure which is pushed by the kernel on the
user stack, along with a pointer to it. */
/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
chain-pointer.
In the case of the i386, the frame's nominal address
is the address of a 4-byte word containing the calling frame's address. */
#undef FRAME_CHAIN
#define FRAME_CHAIN(thisframe) \
(thisframe->signal_handler_caller \
? thisframe->frame \
: (!inside_entry_file ((thisframe)->pc) \
? read_memory_integer ((thisframe)->frame, 4) \
: 0))
/* A macro that tells us whether the function invocation represented
by FI does not have a frame on the stack associated with it. If it
does not, FRAMELESS is set to 1, else 0. */
#undef FRAMELESS_FUNCTION_INVOCATION
#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
do { \
if ((FI)->signal_handler_caller) \
(FRAMELESS) = 0; \
else \
(FRAMELESS) = frameless_look_for_prologue(FI); \
} while (0)
/* Saved Pc. Get it from sigcontext if within sigtramp. */
/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
#define SIGCONTEXT_PC_OFFSET 20
#undef FRAME_SAVED_PC(FRAME)
#define FRAME_SAVED_PC(FRAME) \
(((FRAME)->signal_handler_caller \
? sigtramp_saved_pc (FRAME) \
: read_memory_integer ((FRAME)->frame + 4, 4)) \
)

36
gdb/config/vax/tm-vax.h
View File

@ -17,26 +17,6 @@ You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* There is one known bug with VAX support that I don't know how to
fix: if you do a backtrace from a signal handler, you get something
like:
#0 0xbc in kill (592, 3)
#1 0x7f in hand (...) (...)
#2 0x7fffec7e in ?? (2, 0, 2147478112, 94)
^^ GDB doesn't know about sigtramp
#3 0x7fffec70 in ?? (592, 2)
^^^^^^^^^^ wrong address
#4 0xae in main (...) (...)
when the correct backtrace (as given by adb) is:
_kill(250,3) from _hand+21
_hand(2,0,7fffea60,5e) from 7fffec7e
sigtramp(2,0,7fffea60,5e) from _kill+4
_kill(250,2) from _main+2e
_main(1,7fffeac4,7fffeacc) from start+3d
If anyone knows enough about VAX BSD to fix this, please send the
fix to bug-gdb@prep.ai.mit.edu. */
#define TARGET_BYTE_ORDER LITTLE_ENDIAN
@ -76,14 +56,15 @@ fix to bug-gdb@prep.ai.mit.edu. */
#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
#define TARGET_UPAGES 10
#define TARGET_UPAGES 14
#define TARGET_NBPG 512
#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
/* On the VAX, sigtramp is in the u area. Can't check the exact
addresses because for cross-debugging we don't have VAX include
files around. This should be close enough. */
#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0x80000000))
#define SIGTRAMP_START STACK_END_ADDR
#define SIGTRAMP_END 0x80000000
/* Stack grows downward. */
@ -231,9 +212,16 @@ fix to bug-gdb@prep.ai.mit.edu. */
/* On the vax, all functions have frames. */
#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
/* Saved Pc. */
/* Saved Pc. Get it from sigcontext if within sigtramp. */
#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 16, 4))
/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
#define SIGCONTEXT_PC_OFFSET 12
#define FRAME_SAVED_PC(FRAME) \
(((FRAME)->signal_handler_caller \
? sigtramp_saved_pc (FRAME) \
: read_memory_integer ((FRAME)->frame + 16, 4)) \
)
/* Cannot find the AP register value directly from the FP value. Must
find it saved in the frame called by this one, or in the AP