* config/i386/tm-i386bsd.h (SIGTRAMP_START, SIGTRAMP_END, FRAME_CHAIN,
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
parent
d541211d61
commit
7b98a09136
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@ -27,3 +27,50 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* BSDI can't handle them either. */
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#undef NUM_REGS
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#define NUM_REGS 10
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/* On 386 bsd, sigtramp is above the user stack and immediately below
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the user area. Using constants here allows for cross debugging.
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These are tested for BSDI but should work on 386BSD. */
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#define SIGTRAMP_START 0xfdbfdfc0
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#define SIGTRAMP_END 0xfdbfe000
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/* The following redefines make backtracing through sigtramp work.
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They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
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from the sigcontext structure which is pushed by the kernel on the
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user stack, along with a pointer to it. */
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/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
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chain-pointer.
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In the case of the i386, the frame's nominal address
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is the address of a 4-byte word containing the calling frame's address. */
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#undef FRAME_CHAIN
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#define FRAME_CHAIN(thisframe) \
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(thisframe->signal_handler_caller \
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? thisframe->frame \
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: (!inside_entry_file ((thisframe)->pc) \
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? read_memory_integer ((thisframe)->frame, 4) \
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: 0))
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#undef FRAMELESS_FUNCTION_INVOCATION
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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do { \
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if ((FI)->signal_handler_caller) \
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(FRAMELESS) = 0; \
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else \
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(FRAMELESS) = frameless_look_for_prologue(FI); \
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} while (0)
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/* Saved Pc. Get it from sigcontext if within sigtramp. */
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/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
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#define SIGCONTEXT_PC_OFFSET 20
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#undef FRAME_SAVED_PC(FRAME)
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#define FRAME_SAVED_PC(FRAME) \
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(((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: read_memory_integer ((FRAME)->frame + 4, 4)) \
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)
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@ -17,26 +17,6 @@ You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* There is one known bug with VAX support that I don't know how to
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fix: if you do a backtrace from a signal handler, you get something
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like:
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#0 0xbc in kill (592, 3)
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#1 0x7f in hand (...) (...)
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#2 0x7fffec7e in ?? (2, 0, 2147478112, 94)
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^^ GDB doesn't know about sigtramp
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#3 0x7fffec70 in ?? (592, 2)
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^^^^^^^^^^ wrong address
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#4 0xae in main (...) (...)
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when the correct backtrace (as given by adb) is:
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_kill(250,3) from _hand+21
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_hand(2,0,7fffea60,5e) from 7fffec7e
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sigtramp(2,0,7fffea60,5e) from _kill+4
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_kill(250,2) from _main+2e
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_main(1,7fffeac4,7fffeacc) from start+3d
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If anyone knows enough about VAX BSD to fix this, please send the
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fix to bug-gdb@prep.ai.mit.edu. */
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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@ -76,14 +56,15 @@ fix to bug-gdb@prep.ai.mit.edu. */
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#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
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#define TARGET_UPAGES 10
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#define TARGET_UPAGES 14
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#define TARGET_NBPG 512
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#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
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/* On the VAX, sigtramp is in the u area. Can't check the exact
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addresses because for cross-debugging we don't have VAX include
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files around. This should be close enough. */
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#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0x80000000))
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#define SIGTRAMP_START STACK_END_ADDR
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#define SIGTRAMP_END 0x80000000
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/* Stack grows downward. */
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@ -231,9 +212,16 @@ fix to bug-gdb@prep.ai.mit.edu. */
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/* On the vax, all functions have frames. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
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/* Saved Pc. */
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/* Saved Pc. Get it from sigcontext if within sigtramp. */
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#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 16, 4))
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/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
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#define SIGCONTEXT_PC_OFFSET 12
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#define FRAME_SAVED_PC(FRAME) \
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(((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: read_memory_integer ((FRAME)->frame + 16, 4)) \
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)
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/* Cannot find the AP register value directly from the FP value. Must
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find it saved in the frame called by this one, or in the AP
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