* a29k-tdep.c (init_frame_info): Cast null arg to examine_tag.
(pop_frame): Restore PC2 and LR0 from dummy frames. (push_dummy_frame): Save PC2 and LR0 into dummy frames. (setup_arbitrary_frame): Handle 3 args and set up real frames. * config/a29k/tm-a29k.h (FRAME_NUM_ARGS): Update comments. (DUMMY_FRAME_RSIZE): Add 2 longwords for PC2 and LR0. (SETUP_ARBITRARY_FRAME): Define.
This commit is contained in:
John Gilmore
parent
a1c91916e8
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eb5b74ca6c
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@ -1,3 +1,13 @@
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Tue Jan 11 00:53:46 1994 John Gilmore (gnu@cygnus.com)
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* a29k-tdep.c (init_frame_info): Cast null arg to examine_tag.
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(pop_frame): Restore PC2 and LR0 from dummy frames.
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(push_dummy_frame): Save PC2 and LR0 into dummy frames.
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(setup_arbitrary_frame): Handle 3 args and set up real frames.
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* config/a29k/tm-a29k.h (FRAME_NUM_ARGS): Update comments.
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(DUMMY_FRAME_RSIZE): Add 2 longwords for PC2 and LR0.
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(SETUP_ARBITRARY_FRAME): Define.
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Tue Jan 11 06:59:10 1994 Jim Kingdon (kingdon@deneb.cygnus.com)
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* infrun.c, config/mips/tm-irix5.h: Remove #if 0'd AT_FUNCTION_START.
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@ -437,14 +437,14 @@ init_frame_info (innermost_frame, fci)
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after the trace-back tag. */
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p += 4;
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}
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/* We've found the start of the function.
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* Try looking for a tag word that indicates whether there is a
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* memory frame pointer and what the memory stack allocation is.
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* If one doesn't exist, try using a more exhaustive search of
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* the prologue. For now we don't care about the argcount or
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* whether or not the routine is transparent.
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*/
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if (examine_tag(p-4,&trans,NULL,&msize,&mfp_used)) /* Found a good tag */
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Try looking for a tag word that indicates whether there is a
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memory frame pointer and what the memory stack allocation is.
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If one doesn't exist, try using a more exhaustive search of
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the prologue. */
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if (examine_tag(p-4,&trans,(int *)NULL,&msize,&mfp_used)) /* Found good tag */
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examine_prologue (p, &rsize, 0, 0);
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else /* No tag try prologue */
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examine_prologue (p, &rsize, &msize, &mfp_used);
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@ -730,6 +730,8 @@ pop_frame ()
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CORE_ADDR rfb = read_register (RFB_REGNUM);
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CORE_ADDR gr1 = fi->frame + fi->rsize;
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CORE_ADDR lr1;
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CORE_ADDR original_lr0;
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int must_fix_lr0 = 0;
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int i;
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/* If popping a dummy frame, need to restore registers. */
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@ -744,15 +746,23 @@ pop_frame ()
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write_register (SR_REGNUM(i+160), read_register (lrnum++));
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for (i = 0; i < DUMMY_SAVE_GREGS; ++i)
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write_register (RETURN_REGNUM + i, read_register (lrnum++));
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/* Restore the PCs. */
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/* Restore the PCs and prepare to restore LR0. */
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write_register(PC_REGNUM, read_register (lrnum++));
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write_register(NPC_REGNUM, read_register (lrnum));
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write_register(NPC_REGNUM, read_register (lrnum++));
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write_register(PC2_REGNUM, read_register (lrnum++));
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original_lr0 = read_register (lrnum++);
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must_fix_lr0 = 1;
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}
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/* Restore the memory stack pointer. */
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write_register (MSP_REGNUM, fi->saved_msp);
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/* Restore the register stack pointer. */
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write_register (GR1_REGNUM, gr1);
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/* If we popped a dummy frame, restore lr0 now that gr1 has been restored. */
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if (must_fix_lr0)
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write_register (LR0_REGNUM, original_lr0);
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/* Check whether we need to fill registers. */
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lr1 = read_register (LR0_REGNUM + 1);
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if (lr1 > rfb)
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@ -782,8 +792,13 @@ push_dummy_frame ()
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long w;
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CORE_ADDR rab, gr1;
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CORE_ADDR msp = read_register (MSP_REGNUM);
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int lrnum, i, saved_lr0;
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int lrnum, i;
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CORE_ADDR original_lr0;
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/* Read original lr0 before changing gr1. This order isn't really needed
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since GDB happens to have a snapshot of all the regs and doesn't toss
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it when gr1 is changed. But it's The Right Thing To Do. */
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original_lr0 = read_register (LR0_REGNUM);
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/* Allocate the new frame. */
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gr1 = read_register (GR1_REGNUM) - DUMMY_FRAME_RSIZE;
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@ -826,11 +841,54 @@ push_dummy_frame ()
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write_register (lrnum++, read_register (SR_REGNUM (i + 160)));
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for (i = 0; i < DUMMY_SAVE_GREGS; ++i)
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write_register (lrnum++, read_register (RETURN_REGNUM + i));
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/* Save the PCs. */
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/* Save the PCs and LR0. */
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write_register (lrnum++, read_register (PC_REGNUM));
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write_register (lrnum, read_register (NPC_REGNUM));
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write_register (lrnum++, read_register (NPC_REGNUM));
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write_register (lrnum++, read_register (PC2_REGNUM));
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write_register (lrnum++, original_lr0);
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}
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/*
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This routine takes three arguments and makes the cached frames look
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as if these arguments defined a frame on the cache. This allows the
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rest of `info frame' to extract the important arguments without much
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difficulty. Since an individual frame on the 29K is determined by
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three values (FP, PC, and MSP), we really need all three to do a
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good job. */
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FRAME
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setup_arbitrary_frame (argc, argv)
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int argc;
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FRAME_ADDR *argv;
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{
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FRAME fid;
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if (argc != 3)
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error ("AMD 29k frame specifications require three arguments: rsp pc msp");
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fid = create_new_frame (argv[0], argv[1]);
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if (!fid)
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fatal ("internal: create_new_frame returned invalid frame id");
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/* Creating a new frame munges the `frame' value from the current
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GR1, so we restore it again here. FIXME, untangle all this
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29K frame stuff... */
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fid->frame = argv[0];
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/* Our MSP is in argv[2]. It'd be intelligent if we could just
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save this value in the FRAME. But the way it's set up (FIXME),
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we must save our caller's MSP. We compute that by adding our
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memory stack frame size to our MSP. */
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fid->saved_msp = argv[2] + fid->msize;
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return fid;
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}
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enum a29k_processor_types processor_type = a29k_unknown;
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void
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@ -1,5 +1,5 @@
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/* Parameters for target machine of AMD 29000, for GDB, the GNU debugger.
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Copyright 1990, 1991, 1993 Free Software Foundation, Inc.
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/* Parameters for target machine AMD 29000, for GDB, the GNU debugger.
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Copyright 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Jim Kingdon.
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This file is part of GDB.
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@ -504,16 +504,11 @@ extern CORE_ADDR frame_locals_address ();
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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/* While we could go the effort of finding the tags word and getting
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the argcount field from it,
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(1) It only counts arguments in registers, i.e. the first 16 words
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of arguments
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(2) It gives the number of arguments the function was declared with
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not how many it was called with (or some variation, like all 16
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words for varadic functions). This makes argcount pretty much
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redundant with -g info, even for varadic functions.
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So don't bother. */
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#define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -1)
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/* We tried going to the effort of finding the tags word and getting
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the argcount field from it, to support debugging assembler code.
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Problem was, the "argcount" field never did hold the argument
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count. */
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#define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -1)
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#define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
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@ -544,6 +539,7 @@ extern CORE_ADDR frame_locals_address ();
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|____________|<-msp 0 <-----------mfp_dummy_____| |
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| | (at start) | save regs | |
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| arg_slop | | pc0,pc1 | |
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| | | pc2,lr0 sproc | |
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| (16 words) | | gr96-gr124 | |
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|____________|<-msp 1--after | sr160-sr162 | |
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| | PUSH_DUMMY_FRAME| sr128-sr135 | |
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@ -591,7 +587,7 @@ extern CORE_ADDR frame_locals_address ();
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#define DUMMY_FRAME_RSIZE \
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(4 /* mfp_dummy */ \
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+ 2 * 4 /* pc0, pc1 */ \
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+ 4 * 4 /* pc0, pc1, pc2, lr0 */ \
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+ DUMMY_SAVE_GREGS * 4 \
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+ DUMMY_SAVE_SR160 * 4 \
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+ DUMMY_SAVE_SR128 * 4 \
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@ -716,3 +712,11 @@ extern enum a29k_processor_types {
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/* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050. */
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a29k_freeze_mode
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} processor_type;
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/* We need three arguments for a general frame specification for the
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"frame" or "info frame" command. */
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#define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
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/* FIXME: Depends on equivalence between FRAME and "struct frame_info *",
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and equivalence between CORE_ADDR and FRAME_ADDR. */
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extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));
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