-/* Copyright (C) 1988, 1990 Free Software Foundation, Inc.
+/* Target-machine dependent code for Motorola 88000 series, for GDB.
+ Copyright (C) 1988, 1990, 1991 Free Software Foundation, Inc.
This file is part of GDB.
#include "setjmp.h"
#include "value.h"
-int stack_error;
-jmp_buf stack_jmp;
+void frame_find_saved_regs ();
-void
-tdesc_error_function (environment, continuable, message)
-dc_word_t environment;
-dc_boolean_t continuable;
-char *message;
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+ This will be used to create a new GDB frame struct, and then
+ INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+
+ For us, the frame address is its stack pointer value, so we look up
+ the function prologue to determine the caller's sp value, and return it. */
+
+FRAME_ADDR
+frame_chain (thisframe)
+ FRAME thisframe;
{
- if (stack_error) longjmp (stack_jmp, 1);
- if (!continuable)
- {
- printf("%s\n",message);
- abort();
- }
-}
+ frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
+ /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
+ the ADDRESS, of SP_REGNUM. It also depends on the cache of
+ frame_find_saved_regs results. */
+ if (thisframe->fsr->regs[SP_REGNUM])
+ return thisframe->fsr->regs[SP_REGNUM];
+ else
+ return thisframe->frame; /* Leaf fn -- next frame up has same SP. */
+}
-void
-tdesc_read_function (environment, memory, length, buffer)
-dc_word_t environment;
-dc_word_t memory;
-int length;
-char *buffer;
+int
+frameless_function_invocation (frame)
+ FRAME frame;
{
- int ptrace_code;
- errno = 0;
- if (memory < 2048)
-#if 0
- /* This is a no-op! It sets buffer, but doesn't do anything to
- what buffer points to. What does this function do anyway?
- And this is wrong for cross-debugging. */
- buffer = ptrace (3, inferior_pid, memory, 0);
-#else
- return;
-#endif
+
+ frame_find_saved_regs (frame, (struct frame_saved_regs *) 0);
+ /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
+ the ADDRESS, of SP_REGNUM. It also depends on the cache of
+ frame_find_saved_regs results. */
+ if (frame->fsr->regs[SP_REGNUM])
+ return 0; /* Frameful -- return addr saved somewhere */
else
- read_memory (memory, buffer, length);
+ return 1; /* Frameless -- no saved return address */
}
-/* Map function for tdesc */
-void
-tdesc_map_function (map_env, loc, map_info_in, map_info_out)
-dc_word_t map_env;
-dc_word_t loc;
-dc_map_info_in_t map_info_in;
-dc_map_info_out_t *map_info_out;
+int
+frame_chain_valid (chain, thisframe)
+ CORE_ADDR chain;
+ struct frame_info *thisframe;
{
-int map_flags = DC_MIO_ENTRY_POINT | DC_MIO_IMPLICIT_PROLOGUE_END;
-int entry_point = get_pc_function_start(loc);
-map_info_out->flags = map_flags;
-map_info_out->entry_point = entry_point;
+ return (chain != 0
+ && outside_startup_file (FRAME_SAVED_PC (thisframe)));
}
-dc_handle_t tdesc_handle;
+CORE_ADDR
+frame_chain_combine (chain, thisframe)
+ CORE_ADDR chain;
+{
+ return chain;
+}
-extern int debug_info;
+void
+init_extra_frame_info (fromleaf, fi)
+ int fromleaf;
+ struct frame_info *fi;
+{
+ fi->fsr = 0; /* Not yet allocated */
+ fi->args_pointer = 0; /* Unknown */
+ fi->locals_pointer = 0; /* Unknown */
+}
void
-init_tdesc ()
+init_frame_pc (fromleaf, prev)
+ int fromleaf;
+ struct frame_info *prev;
{
- tdesc_handle = dc_initiate (debug_info, tdesc_error_function,
- 0,tdesc_read_function,0,0,0,0,0,tdesc_map_function,0);
-}
-dc_dcontext_t current_context;
-
-/* setup current context, called from wait_for_inferior */
+ /* FIXME, for now it's the default from blockframe.c. If it stays that
+ way, remove it entirely from here. */
+ prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) :
+ prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
+
+}
+\f
+/* Examine an m88k function prologue, recording the addresses at which
+ registers are saved explicitly by the prologue code, and returning
+ the address of the first instruction after the prologue (but not
+ after the instruction at address LIMIT, as explained below).
+
+ LIMIT places an upper bound on addresses of the instructions to be
+ examined. If the prologue code scan reaches LIMIT, the scan is
+ aborted and LIMIT is returned. This is used, when examining the
+ prologue for the current frame, to keep examine_prologue () from
+ claiming that a given register has been saved when in fact the
+ instruction that saves it has not yet been executed. LIMIT is used
+ at other times to stop the scan when we hit code after the true
+ function prologue (e.g. for the first source line) which might
+ otherwise be mistaken for function prologue.
+
+ The format of the function prologue matched by this routine is
+ derived from examination of the source to gcc 1.95, particularly
+ the routine output_prologue () in config/out-m88k.c.
+
+ subu r31,r31,n # stack pointer update
+
+ (st rn,r31,offset)? # save incoming regs
+ (st.d rn,r31,offset)?
+
+ (addu r30,r31,n)? # frame pointer update
+
+ (pic sequence)? # PIC code prologue
+*/
+
+/* Macros for extracting fields from instructions. */
+
+#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
+#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
+
+/* Prologue code that handles position-independent-code setup. */
+
+struct pic_prologue_code {
+ unsigned long insn, mask;
+};
+
+static struct pic_prologue_code pic_prologue_code [] = {
+/* FIXME -- until this is translated to hex, we won't match it... */
+ 0xffffffff, 0,
+ /* or r10,r1,0 (if not saved) */
+ /* bsr.n LabN */
+ /* or.u r25,r0,const */
+ /*LabN: or r25,r25,const2 */
+ /* addu r25,r25,1 */
+ /* or r1,r10,0 (if not saved) */
+};
+
+/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
+ is not the address of a valid instruction, the address of the next
+ instruction beyond ADDR otherwise. *PWORD1 receives the first word
+ of the instruction. PWORD2 is ignored -- a remnant of the original
+ i960 version. */
+
+#define NEXT_PROLOGUE_INSN(addr, lim, pword1, pword2) \
+ (((addr) < (lim)) ? next_insn (addr, pword1) : 0)
+
+/* Read the m88k instruction at 'memaddr' and return the address of
+ the next instruction after that, or 0 if 'memaddr' is not the
+ address of a valid instruction. The instruction
+ is stored at 'pword1'. */
-dc_dcontext_t
-init_dcontext()
+CORE_ADDR
+next_insn (memaddr, pword1)
+ unsigned long *pword1;
+ CORE_ADDR memaddr;
{
- dc_word_t reg_info[DC_NUM_REG];
- dc_word_t reg_flags[2] = {0,-1};
- dc_word_t aux_info[DC_NUM_AUX];
- dc_word_t aux_flags[2] = {0,-1};
- dc_exactness_t loc_exact = DC_NO;
- dc_word_t psr_info;
- dc_boolean_t psr_ind = 0;
- dc_word_t psr_flags[2] = {0,-1};
-
- bcopy (®isters, reg_info, DC_NUM_REG * 4);
- aux_info[DC_AUX_LOC] = read_register(SXIP_REGNUM);
- aux_info[DC_AUX_SXIP] = read_register(SXIP_REGNUM);
- aux_info[DC_AUX_SNIP] = read_register(SNIP_REGNUM);
- aux_info[DC_AUX_SFIP] = read_register(SFIP_REGNUM);
- aux_info[DC_AUX_FPSR] = read_register(FPSR_REGNUM);
- aux_info[DC_AUX_FPCR] = read_register(FPCR_REGNUM);
-
- psr_info = read_register(PSR_REGNUM);
-
- return dc_make_dcontext (tdesc_handle, reg_info, reg_flags, aux_info,
- aux_flags, loc_exact, psr_info, psr_ind, psr_flags);
+ unsigned long buf[1];
+
+ read_memory (memaddr, buf, sizeof (buf));
+ *pword1 = buf[0];
+ SWAP_TARGET_AND_HOST (pword1, sizeof (long));
+
+ return memaddr + 4;
}
+/* Read a register from frames called by us (or from the hardware regs). */
-dc_dcontext_t
-get_prev_context (context)
- dc_dcontext_t context;
+int
+read_next_frame_reg(fi, regno)
+ FRAME fi;
+ int regno;
{
- return current_context = dc_previous_dcontext (context);
+ for (; fi; fi = fi->next) {
+ if (regno == SP_REGNUM) return fi->frame;
+ else if (fi->fsr->regs[regno])
+ return read_memory_integer(fi->fsr->regs[regno], 4);
+ }
+ return read_register(regno);
}
-
+/* Examine the prologue of a function. `ip' points to the first instruction.
+ `limit' is the limit of the prologue (e.g. the addr of the first
+ linenumber, or perhaps the program counter if we're stepping through).
+ `frame_sp' is the stack pointer value in use in this frame.
+ `fsr' is a pointer to a frame_saved_regs structure into which we put
+ info about the registers saved by this frame.
+ `fi' is a struct frame_info pointer; we fill in various fields in it
+ to reflect the offsets of the arg pointer and the locals pointer. */
+
+static CORE_ADDR
+examine_prologue (ip, limit, frame_sp, fsr, fi)
+ register CORE_ADDR ip;
+ register CORE_ADDR limit;
+ FRAME_ADDR frame_sp;
+ struct frame_saved_regs *fsr;
+ struct frame_info *fi;
+{
+ register CORE_ADDR next_ip;
+ register int src;
+ register struct pic_prologue_code *pcode;
+ unsigned int insn1, insn2;
+ int size, offset;
+ char must_adjust[32]; /* If set, must adjust offsets in fsr */
+ int sp_offset = -1; /* -1 means not set (valid must be mult of 8) */
+ int fp_offset = -1; /* -1 means not set */
+ CORE_ADDR frame_fp;
+
+ bzero (must_adjust, sizeof (must_adjust));
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+
+ /* Accept an optional "subu sp,sp,n" to set up the stack pointer. */
+
+#define SUBU_SP_INSN 0x67ff0000
+#define SUBU_SP_MASK 0xffff0007 /* Note offset must be mult. of 8 */
+#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+ if (next_ip &&
+ ((insn1 & SUBU_SP_MASK) == SUBU_SP_INSN)) /* subu r31, r31, N */
+ {
+ sp_offset = -SUBU_OFFSET (insn1);
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+ }
+
+ /* The function must start with a stack-pointer adjustment, or
+ we don't know WHAT'S going on... */
+ if (sp_offset == -1)
+ return ip;
+
+ /* Accept zero or more instances of "st rx,sp,n" or "st.d rx,sp,n".
+ This may cause us to mistake the copying of a register
+ parameter to the frame for the saving of a callee-saved
+ register, but that can't be helped, since with the
+ "-fcall-saved" flag, any register can be made callee-saved.
+ This probably doesn't matter, since the ``saved'' caller's values of
+ non-callee-saved registers are not relevant anyway. */
+
+#define STD_STACK_INSN 0x201f0000
+#define STD_STACK_MASK 0xfc1f0000
+#define ST_STACK_INSN 0x241f0000
+#define ST_STACK_MASK 0xfc1f0000
+#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
+#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
+
+ while (next_ip)
+ {
+ if ((insn1 & ST_STACK_MASK) == ST_STACK_INSN)
+ size = 1;
+ else if ((insn1 & STD_STACK_MASK) == STD_STACK_INSN)
+ size = 2;
+ else
+ break;
+
+ src = ST_SRC (insn1);
+ offset = ST_OFFSET (insn1);
+ while (size--)
+ {
+ must_adjust[src] = 1;
+ fsr->regs[src++] = offset; /* Will be adjusted later */
+ offset += 4;
+ }
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+ }
+
+ /* Accept an optional "addu r30,r31,n" to set up the frame pointer. */
+
+#define ADDU_FP_INSN 0x63df0000
+#define ADDU_FP_MASK 0xffff0000
+#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+ if (next_ip &&
+ ((insn1 & ADDU_FP_MASK) == ADDU_FP_INSN)) /* addu r30, r31, N */
+ {
+ fp_offset = ADDU_OFFSET (insn1);
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+ }
+
+ /* Accept the PIC prologue code if present. */
+
+ pcode = pic_prologue_code;
+ size = sizeof (pic_prologue_code) / sizeof (*pic_prologue_code);
+ /* If return addr is saved, we don't use first or last insn of PICstuff. */
+ if (fsr->regs[SRP_REGNUM]) {
+ pcode++;
+ size-=2;
+ }
+
+ while (size-- && next_ip && (pcode->insn == (pcode->mask & insn1)))
+ {
+ pcode++;
+ ip = next_ip;
+ next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
+ }
+
+ /* We're done with the prologue. If we don't care about the stack
+ frame itself, just return. (Note that fsr->regs has been trashed,
+ but the one caller who calls with fi==0 passes a dummy there.) */
+
+ if (fi == 0)
+ return ip;
+
+ /* OK, now we have:
+ sp_offset original negative displacement of SP
+ fp_offset positive displacement between new SP and new FP, or -1
+ fsr->regs[0..31] offset from original SP where reg is stored
+ must_adjust[0..31] set if corresp. offset was set
+
+ The current SP (frame_sp) might not be the original new SP as set
+ by the function prologue, if alloca has been called. This can
+ only occur if fp_offset is set, though (the compiler allocates an
+ FP when it sees alloca). In that case, we have the FP,
+ and can calculate the original new SP from the FP.
+
+ Then, we figure out where the arguments and locals are, and
+ relocate the offsets in fsr->regs to absolute addresses. */
+
+ if (fp_offset != -1) {
+ /* We have a frame pointer, so get it, and base our calc's on it. */
+ frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, FP_REGNUM);
+ frame_sp = frame_fp - fp_offset;
+ } else {
+ /* We have no frame pointer, therefore frame_sp is still the same value
+ as set by prologue. But where is the frame itself? */
+ if (must_adjust[SRP_REGNUM]) {
+ /* Function header saved SRP (r1), the return address. Frame starts
+ 4 bytes down from where it was saved. */
+ frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4;
+ fi->locals_pointer = frame_fp;
+ } else {
+ /* Function header didn't save SRP (r1), so we are in a leaf fn or
+ are otherwise confused. */
+ frame_fp = -1;
+ }
+ }
+
+ /* The locals are relative to the FP (whether it exists as an allocated
+ register, or just as an assumed offset from the SP) */
+ fi->locals_pointer = frame_fp;
+
+ /* The arguments are just above the SP as it was before we adjusted it
+ on entry. */
+ fi->args_pointer = frame_sp - sp_offset;
+
+ /* Now that we know the SP value used by the prologue, we know where
+ it saved all the registers. */
+ for (src = 0; src < 32; src++)
+ if (must_adjust[src])
+ fsr->regs[src] += frame_sp;
+
+ /* The saved value of the SP is always known. */
+ /* (we hope...) */
+ if (fsr->regs[SP_REGNUM] != 0
+ && fsr->regs[SP_REGNUM] != frame_sp - sp_offset)
+ fprintf(stderr, "Bad saved SP value %x != %x, offset %x!\n",
+ fsr->regs[SP_REGNUM],
+ frame_sp - sp_offset, sp_offset);
+
+ fsr->regs[SP_REGNUM] = frame_sp - sp_offset;
+ return (ip);
+}
-/* Determine frame base for this file's frames. This will be either
- the CFA or the old style FP_REGNUM; the symtab for the current pc's
- file has the information */
+/* Given an ip value corresponding to the start of a function,
+ return the ip of the first instruction after the function
+ prologue. */
CORE_ADDR
-get_frame_base(pc)
-CORE_ADDR pc;
+skip_prologue (ip)
+ CORE_ADDR (ip);
{
- struct symtab *this_file = find_pc_symtab(pc);
- int coffsem_frame_position;
-
- /* If this_file is null, there's a good chance the file was compiled
- without -g. If that's the case, use CFA (canonical frame addr)
- as the default frame pointer. */
+ struct frame_saved_regs saved_regs_dummy;
+ struct symtab_and_line sal;
+ CORE_ADDR limit;
- if (this_file)
+ sal = find_pc_line (ip, 0);
+ limit = (sal.end) ? sal.end : 0xffffffff;
+
+ return (examine_prologue (ip, limit, (FRAME_ADDR) 0, &saved_regs_dummy,
+ (struct frame_info *)0 ));
+}
+
+/* Put here the code to store, into a struct frame_saved_regs,
+ the addresses of the saved registers of frame described by FRAME_INFO.
+ This includes special registers such as pc and fp saved in special
+ ways in the stack frame. sp is even more special:
+ the address we return for it IS the sp for the next frame.
+
+ We cache the result of doing this in the frame_cache_obstack, since
+ it is fairly expensive. */
+
+void
+frame_find_saved_regs (fi, fsr)
+ struct frame_info *fi;
+ struct frame_saved_regs *fsr;
+{
+ register CORE_ADDR next_addr;
+ register CORE_ADDR *saved_regs;
+ register int regnum;
+ register struct frame_saved_regs *cache_fsr;
+ extern struct obstack frame_cache_obstack;
+ CORE_ADDR ip;
+ struct symtab_and_line sal;
+ CORE_ADDR limit;
+
+ if (!fi->fsr)
{
- coffsem_frame_position = this_file->coffsem & 3;
- if (coffsem_frame_position == 1)
- return (CORE_ADDR) dc_general_register (current_context, FP_REGNUM);
- else
- /* default is CFA, as well as if coffsem==2 */
- return (CORE_ADDR) dc_frame_address (current_context);
+ cache_fsr = (struct frame_saved_regs *)
+ obstack_alloc (&frame_cache_obstack,
+ sizeof (struct frame_saved_regs));
+ bzero (cache_fsr, sizeof (struct frame_saved_regs));
+ fi->fsr = cache_fsr;
+
+ /* Find the start and end of the function prologue. If the PC
+ is in the function prologue, we only consider the part that
+ has executed already. */
+
+ ip = get_pc_function_start (fi->pc);
+ sal = find_pc_line (ip, 0);
+ limit = (sal.end && sal.end < fi->pc) ? sal.end: fi->pc;
+
+ /* This will fill in fields in *fi as well as in cache_fsr. */
+ examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
}
- return (CORE_ADDR) dc_frame_address (current_context);
+ if (fsr)
+ *fsr = *fi->fsr;
+}
+
+/* Return the address of the locals block for the frame
+ described by FI. Returns 0 if the address is unknown.
+ NOTE! Frame locals are referred to by negative offsets from the
+ argument pointer, so this is the same as frame_args_address(). */
+
+CORE_ADDR
+frame_locals_address (fi)
+ struct frame_info *fi;
+{
+ register FRAME frame;
+ struct frame_saved_regs fsr;
+ CORE_ADDR ap;
+
+ if (fi->args_pointer) /* Cached value is likely there. */
+ return fi->args_pointer;
+
+ /* Nope, generate it. */
+
+ get_frame_saved_regs (fi, &fsr);
+
+ return fi->args_pointer;
+}
+
+/* Return the address of the argument block for the frame
+ described by FI. Returns 0 if the address is unknown. */
+
+CORE_ADDR
+frame_args_address (fi)
+ struct frame_info *fi;
+{
+ register FRAME frame;
+ struct frame_saved_regs fsr;
+ CORE_ADDR ap;
+
+ if (fi->args_pointer) /* Cached value is likely there. */
+ return fi->args_pointer;
+
+ /* Nope, generate it. */
+
+ get_frame_saved_regs (fi, &fsr);
+
+ return fi->args_pointer;
+}
+
+/* Return the saved PC from this frame.
+
+ If the frame has a memory copy of SRP_REGNUM, use that. If not,
+ just use the register SRP_REGNUM itself. */
+
+CORE_ADDR
+frame_saved_pc (frame)
+ FRAME frame;
+{
+ return read_next_frame_reg(frame, SRP_REGNUM);
}
+
#if TARGET_BYTE_ORDER != HOST_BYTE_ORDER
you lose
#else /* Host and target byte order the same. */
}
#endif /* Host and target byte order the same. */
-#define FIRST_PRESERVED_REGNUM 14
-#define LAST_PRESERVED_REGNUM 25
-#define FIRST_PARM_REGNUM 2
-#define LAST_PARM_REGNUM 9
-
-#define MAX_REG_PARMS (LAST_PARM_REGNUM - FIRST_PARM_REGNUM + 1)
-
-void
-frame_find_saved_regs (fi, fsr)
- struct frame_info *fi;
- struct frame_saved_regs *fsr;
-{
- register int regnum;
-
- error ("Feature not implemented for the 88k yet.");
- return;
-
-#if 0
- for (regnum = FIRST_PARM_REGNUM; regnum <= LAST_PARM_REGNUM; regnum++)
- fsr->regs[regnum]
- = (unsigned) fi->frame - ((regnum - FIRST_PARM_REGNUM) * 4);
-
- fsr->regs[SP_REGNUM] = 0; /* SP not saved in frames */
- fsr->regs[FP_REGNUM] = fi->frame;
- fsr->regs[PC_REGNUM] = fi->frame + 4;
-#endif
-}
-
static int
pushed_size (prev_words, v)
int prev_words;
end up storing *all* parameter values onto the stack (even if we will
realize later that some of these stores were unnecessary). */
+#define FIRST_PARM_REGNUM 2
+
void
push_parameters (return_type, struct_conv, nargs, args)
struct type *return_type;
int struct_conv;
int nargs;
value *args;
- {
+{
int parm_num;
unsigned int p_words = 0;
CORE_ADDR left_parm_addr;
return;
}
- void
- collect_returned_value (rval, value_type, struct_return, nargs, args)
- value *rval;
- struct type *value_type;
- int struct_return;
- int nargs;
- value *args;
- {
- char retbuf[REGISTER_BYTES];
-
- bcopy (registers, retbuf, REGISTER_BYTES);
- *rval = value_being_returned (value_type, retbuf, struct_return);
- return;
- }
+void
+collect_returned_value (rval, value_type, struct_return, nargs, args)
+ value *rval;
+ struct type *value_type;
+ int struct_return;
+ int nargs;
+ value *args;
+{
+ char retbuf[REGISTER_BYTES];
+
+ bcopy (registers, retbuf, REGISTER_BYTES);
+ *rval = value_being_returned (value_type, retbuf, struct_return);
+ return;
+}
#if 0
/* Now handled in a machine independent way with CALL_DUMMY_LOCATION. */
is not a good place for it). Return the address at which the instruction
got stuffed, or zero if we were unable to stuff it anywhere. */
- CORE_ADDR
- push_breakpoint ()
- {
- static char breakpoint_insn[] = BREAKPOINT;
- extern CORE_ADDR text_end; /* of inferior */
- static char readback_buffer[] = BREAKPOINT;
- int i;
-
- /* With a little bit of luck, we can just stash the breakpoint instruction
- in the word just beyond the end of normal text space. For systems on
- which the hardware will not allow us to execute out of the stack segment,
- we have to hope that we *are* at least allowed to effectively extend the
- text segment by one word. If the actual end of user's the text segment
- happens to fall right at a page boundary this trick may fail. Note that
- we check for this by reading after writing, and comparing in order to
- be sure that the write worked. */
-
- write_memory (text_end, &breakpoint_insn, 4);
-
- /* Fill the readback buffer with some garbage which is certain to be
- unequal to the breakpoint insn. That way we can tell if the
- following read doesn't actually succeed. */
-
- for (i = 0; i < sizeof (readback_buffer); i++)
- readback_buffer[i] = ~ readback_buffer[i]; /* Invert the bits */
-
- /* Now check that the breakpoint insn was successfully installed. */
-
- read_memory (text_end, readback_buffer, sizeof (readback_buffer));
- for (i = 0; i < sizeof (readback_buffer); i++)
- if (readback_buffer[i] != breakpoint_insn[i])
- return 0; /* Failed to install! */
+CORE_ADDR
+push_breakpoint ()
+{
+ static char breakpoint_insn[] = BREAKPOINT;
+ extern CORE_ADDR text_end; /* of inferior */
+ static char readback_buffer[] = BREAKPOINT;
+ int i;
- return text_end;
- }
-#endif
+ /* With a little bit of luck, we can just stash the breakpoint instruction
+ in the word just beyond the end of normal text space. For systems on
+ which the hardware will not allow us to execute out of the stack segment,
+ we have to hope that we *are* at least allowed to effectively extend the
+ text segment by one word. If the actual end of user's the text segment
+ happens to fall right at a page boundary this trick may fail. Note that
+ we check for this by reading after writing, and comparing in order to
+ be sure that the write worked. */
-/* Like dc_psr_register but takes an extra int arg. */
-static dc_word_t
-psr_register (context, dummy)
- dc_dcontext_t context;
- int dummy;
-{
- return dc_psr_register (context);
-}
+ write_memory (text_end, &breakpoint_insn, 4);
-/* Same functionality as get_saved_register in findvar.c, but implemented
- to use tdesc. */
-void
-get_saved_register (raw_buffer, optim, addrp, frame, regnum, lvalp)
- char *raw_buffer;
- int *optim;
- CORE_ADDR *addrp;
- FRAME frame;
- int regnum;
- enum lval_type *lvalp;
-{
- struct frame_info *fi = get_frame_info (frame);
-
- /* Functions to say whether a register is optimized out, and
- if not, to get the value. Take as args a context and the
- value of get_reg_arg. */
- int (*get_reg_state) ();
- dc_word_t (*get_reg) ();
- int get_reg_arg;
-
- /* Because tdesc doesn't tell us whether it got it from a register
- or memory, always say we don't have an address for it. */
- if (addrp != NULL)
- *addrp = 0;
-
- if (regnum < DC_NUM_REG)
- {
- get_reg_state = dc_general_register_state;
- get_reg = dc_general_register;
- get_reg_arg = regnum;
- }
- else
- {
- get_reg_state = dc_auxiliary_register_state;
- get_reg = dc_auxiliary_register;
- switch (regnum)
- {
- case SXIP_REGNUM:
- get_reg_arg = DC_AUX_SXIP;
- break;
- case SNIP_REGNUM:
- get_reg_arg = DC_AUX_SNIP;
- break;
- case FPSR_REGNUM:
- get_reg_arg = DC_AUX_FPSR;
- break;
- case FPCR_REGNUM:
- get_reg_arg = DC_AUX_FPCR;
- break;
- case PSR_REGNUM:
- get_reg_state = dc_psr_register_bit_state;
- get_reg = psr_register;
- get_reg_arg = 0;
- break;
- default:
- if (optim != NULL)
- *optim = 1;
- return;
- }
- }
+ /* Fill the readback buffer with some garbage which is certain to be
+ unequal to the breakpoint insn. That way we can tell if the
+ following read doesn't actually succeed. */
- if ((*get_reg_state) (fi->frame_context, get_reg_arg))
- {
- if (raw_buffer != NULL)
- *(int *)raw_buffer = (*get_reg) (fi->frame_context, get_reg_arg);
- if (optim != NULL)
- *optim = 0;
- return;
- }
- else
- {
- if (optim != NULL)
- *optim = 1;
- return;
- }
+ for (i = 0; i < sizeof (readback_buffer); i++)
+ readback_buffer[i] = ~ readback_buffer[i]; /* Invert the bits */
+
+ /* Now check that the breakpoint insn was successfully installed. */
- /* Well, the caller can't treat it as a register or memory... */
- if (lvalp != NULL)
- *lvalp = not_lval;
+ read_memory (text_end, readback_buffer, sizeof (readback_buffer));
+ for (i = 0; i < sizeof (readback_buffer); i++)
+ if (readback_buffer[i] != breakpoint_insn[i])
+ return 0; /* Failed to install! */
+
+ return text_end;
}
+#endif
/* g++ support is not yet included. */
-#include "tdesc.h"
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+/* We cache information about saved registers in the frame structure,
+ to save us from having to re-scan function prologues every time
+ a register in a non-current frame is accessed. */
-#define TARGET_BYTE_ORDER BIG_ENDIAN
+#define EXTRA_FRAME_INFO \
+ struct frame_saved_regs *fsr; \
+ CORE_ADDR locals_pointer; \
+ CORE_ADDR args_pointer;
+
+/* Zero the frame_saved_regs pointer when the frame is initialized,
+ so that FRAME_FIND_SAVED_REGS () will know to allocate and
+ initialize a frame_saved_regs struct the first time it is called.
+ Set the arg_pointer to -1, which is not valid; 0 and other values
+ indicate real, cached values. */
-#define EXTRA_SYMTAB_INFO int coffsem;
-
-/* This is not a CREATE_INFERIOR_HOOK because it also applies to
- remote debugging. */
-#define START_INFERIOR_HOOK() \
- { \
- extern int safe_to_init_tdesc_context; \
- extern dc_handle_t tdesc_handle; \
- \
- safe_to_init_tdesc_context = 0; \
- if (tdesc_handle) \
- { \
- dc_terminate (tdesc_handle); \
- tdesc_handle = 0; \
- } \
- }
-
-dc_dcontext_t get_prev_context ();
-extern int stack_error;
-
-#define EXTRA_FRAME_INFO dc_dcontext_t frame_context;
-#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
- { \
- if (fci->next_frame != NULL) \
- { \
- extern jmp_buf stack_jmp; \
- struct frame_info *next_frame = fci->next; \
- /* The call to get_prev_context */ \
- /* will update current_context for us. */ \
- stack_error = 1; \
- if (!setjmp (stack_jmp)) \
- { \
- fci->frame_context \
- = get_prev_context (next_frame->frame_context); \
- stack_error = 0; \
- } \
- else \
- { \
- stack_error = 0; \
- next_frame->prev = 0; \
- return 0; \
- } \
- if (!fci->frame_context) \
- { \
- next_frame->prev = 0; \
- return 0; \
- } \
- } \
- else \
- { \
- /* We are creating an arbitrary frame */ \
- /* (i.e. we are in create_new_frame). */ \
- extern dc_dcontext_t current_context; \
- \
- fci->frame_context = current_context; \
- } \
- }
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
+ init_extra_frame_info (fromleaf, fi)
+extern void init_extra_frame_info ();
#define INIT_FRAME_PC(fromleaf, prev) \
- { \
- prev->pc = dc_location (prev->frame_context); \
- prev->frame = get_frame_base (prev->pc); \
- }
+ init_frame_pc (fromleaf, prev)
+extern void init_frame_pc ();
#define IEEE_FLOAT
-/* Text Description (TDESC) is used by m88k to maintain stack & reg info */
-
-#define TDESC
-
/* Define this if the C compiler puts an underscore at the front
of external names before giving them to the linker. */
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
-#define SKIP_PROLOGUE(frompc) 0
+#define SKIP_PROLOGUE(frompc) \
+ skip_prologue (frompc)
+extern CORE_ADDR skip_prologue ();
/* The m88k kernel aligns all instructions on 4-byte boundaries. The
kernel also uses the least significant two bits for its own hocus
some instructions. */
#define SAVED_PC_AFTER_CALL(frame) \
- (read_register (SRP_REGNUM) & (~3))
-
-/* Address of end of stack space. */
-
-#define STACK_END_ADDR 0xF0000000
-
-/* Stack grows downward. */
-
-#define INNER_THAN <
+ (ADDR_BITS_REMOVE (read_register (SRP_REGNUM)))
-/* Sequence of bytes for breakpoint instruction. */
-
-/* instruction 0xF000D1FF is 'tb0 0,r0,511'
- If Bit bit 0 of r0 is clear (always true),
- initiate exception processing (trap).
- */
-#define BREAKPOINT {0xF0, 0x00, 0xD1, 0xFF}
-
-/* Address of end of stack space. */
+/* Address of end of stack space (in core files). */
#define STACK_END_ADDR 0xF0000000
#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0xF800)
/* Return 1 if P points to an invalid floating point value.
- LEN is the length in bytes -- not relevant on the 386. */
+ LEN is the length in bytes. */
#define INVALID_FLOAT(p, len) IEEE_isNAN(p,len)
#define SRP_REGNUM 1 /* Contains subroutine return pointer */
#define RV_REGNUM 2 /* Contains simple return values */
#define SRA_REGNUM 12 /* Contains address of struct return values */
-#define FP_REGNUM 30 /* Contains address of executing stack frame */
+#define FP_REGNUM 31 /* Reg fetched to locate frame when pgm stops */
#define SP_REGNUM 31 /* Contains address of top of stack */
#define SXIP_REGNUM 35 /* Contains Shadow Execute Instruction Pointer */
#define SNIP_REGNUM 36 /* Contains Shadow Next Instruction Pointer */
#define BELIEVE_PCC_PROMOTION 1
-/* We provide our own get_saved_register in m88k-tdep.c. */
-#define GET_SAVED_REGISTER
-
/* Describe the pointer in each stack frame to the previous stack frame
(its caller). */
it means the given frame is the outermost one and has no caller.
In that case, FRAME_CHAIN_COMBINE is not used. */
-/* These are just dummies for the 88k because INIT_FRAME_PC sets prev->frame
- instead. */
+extern CORE_ADDR frame_chain ();
+extern int frame_chain_valid ();
+extern CORE_ADDR frame_chain_combine ();
+extern int frameless_function_invocation ();
+
+#define FRAME_CHAIN(thisframe) \
+ frame_chain (thisframe)
-#define FRAME_CHAIN(thisframe) (0)
+#define FRAME_CHAIN_VALID(chain, thisframe) \
+ frame_chain_valid (chain, thisframe)
-#define FRAME_CHAIN_VALID(chain, thisframe) (1)
+#define FRAME_CHAIN_COMBINE(chain, thisframe) \
+ frame_chain_combine (chain, thisframe)
-#define FRAME_CHAIN_COMBINE(chain, thisframe) (0)
+#define FRAMELESS_FUNCTION_INVOCATION(frame, fromleaf) \
+ fromleaf = frameless_function_invocation (frame)
/* Define other aspects of the stack frame. */
-#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame+4, 4))
+#define FRAME_SAVED_PC(FRAME) \
+ frame_saved_pc (FRAME)
+extern CORE_ADDR frame_saved_pc ();
-#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
+#define FRAME_ARGS_ADDRESS(fi) \
+ frame_args_address (fi)
+extern CORE_ADDR frame_args_address ();
-#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
+#define FRAME_LOCALS_ADDRESS(fi) \
+ frame_locals_address (fi)
+extern CORE_ADDR frame_locals_address ();
/* Return number of args passed to a frame.
Can return -1, meaning no way to tell. */
projects / binutils-gdb.git / commitdiff