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Support for accessing arbitrary MIPS stack frames in memory. 

* blockframe.c (get_prev_frame_info):  If INIT_FRAME_PC_FIRST is
set, run it before INIT_EXTRA_FRAME_INFO.
* stack.c (frame_info):  If PRINT_EXTRA_FRAME_INFO defined, call it.

* mips-tdep.c (init_extra_frame_info): Only clobber the `frame'
(FP) value in the frame_info struct if it is zero (as from top of
execution stack).
(setup_arbitrary_frame):  Implement FRAME_SPECIFICATION_DYADIC.

* mips-xdep.c (fetch_inferior_registers):  ZERO_REGNUM always
comes back as zero.  So does FP_REGNUM, as a trigger for
init_extra_frame_info.

* tm-mips.h (INIT_FRAME_PC_FIRST):  Kludge, FIXME, defined to get
the program counter set before INIT_EXTRA_FRAME_INFO is run.
(INIT_FRAME_PC):  Defined to null.
(PRINT_EXTRA_FRAME_INFO): print frame pointer location via symtab.
(FRAME_SPECIFICATION_DYADIC):  Ask for two args in frame command.
Briefly explain MIPS stacks in GDB.
This commit is contained in:
John Gilmore 1992-09-18 09:20:15 +00:00
parent 68ca323803
commit 2886f8b253
3 changed files with 58 additions and 0 deletions
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24
gdb/ChangeLog
View File

@ -1,3 +1,27 @@
Fri Sep 18 02:07:39 1992 John Gilmore (gnu@cygnus.com)
Support for accessing arbitrary MIPS stack frames in memory.
* blockframe.c (get_prev_frame_info): If INIT_FRAME_PC_FIRST is
set, run it before INIT_EXTRA_FRAME_INFO.
* stack.c (frame_info): If PRINT_EXTRA_FRAME_INFO defined, call it.
* mips-tdep.c (init_extra_frame_info): Only clobber the `frame'
(FP) value in the frame_info struct if it is zero (as from top of
execution stack).
(setup_arbitrary_frame): Implement FRAME_SPECIFICATION_DYADIC.
* mips-xdep.c (fetch_inferior_registers): ZERO_REGNUM always
comes back as zero. So does FP_REGNUM, as a trigger for
init_extra_frame_info.
* tm-mips.h (INIT_FRAME_PC_FIRST): Kludge, FIXME, defined to get
the program counter set before INIT_EXTRA_FRAME_INFO is run.
(INIT_FRAME_PC): Defined to null.
(PRINT_EXTRA_FRAME_INFO): print frame pointer location via symtab.
(FRAME_SPECIFICATION_DYADIC): Ask for two args in frame command.
Briefly explain MIPS stacks in GDB.
Thu Sep 17 03:49:59 1992 John Gilmore (gnu@cygnus.com)
* copying.awk, copying.c (show_copying_command,

6
gdb/mips-xdep.c
View File

@ -81,6 +81,8 @@ store_inferior_registers (regno)
: regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
: 0)
static const char zerobuf[MAX_REGISTER_RAW_SIZE];
/* Get all registers from the inferior */
void
@ -104,6 +106,10 @@ fetch_inferior_registers (regno)
}
supply_register (regno, buf);
}
supply_register (ZERO_REGNUM, zerobuf);
/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
supply_register (FP_REGNUM, zerobuf);
}
/* Store our register values back into the inferior.

28
gdb/tm-mips.h
View File

@ -318,6 +318,15 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
(((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
((int*)dummyname)[12] |= (unsigned short)(fun))
/* There's a mess in stack frame creation. See comments in blockframe.c
near reference to INIT_FRAME_PC_FIRST. */
#define INIT_FRAME_PC(fromleaf, prev) /* nada */
#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
(prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
(prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
/* Specific information about a procedure.
This overlays the MIPS's PDR records,
mipsread.c (ab)uses this to save memory */
@ -334,6 +343,25 @@ typedef struct mips_extra_func_info {
#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
#define PRINT_EXTRA_FRAME_INFO(fi) \
{ \
if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \
printf_filtered (" frame pointer is at %s+%d\n", \
reg_names[fi->proc_desc->pdr.framereg], \
fi->proc_desc->pdr.frameoffset); \
}
/* It takes two values to specify a frame (at least!) on the MIPS. Sigh.
In fact, at the moment, the *PC* is the primary value that sets up
a frame. The PC is looked up to see what function it's in; symbol
information from that function tells us which register is the frame
pointer base, and what offset from there is the "virtual frame pointer".
(This is usually an offset from SP.) FIXME -- this should be cleaned
up so that the primary value is the SP, and the PC is used to disambiguate
multiple functions with the same SP that are at different stack levels. */
#define FRAME_SPECIFICATION_DYADIC
#define STAB_REG_TO_REGNUM(num) ((num) < 32 ? (num) : (num)+FP0_REGNUM-32)
/* Size of elements in jmpbuf */