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* mips-tdep.c (mips_skip_prologue): Always skip the typical prologue

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instructions and nothing more.
	* mipsread.c (add_line): Add comment why we have to combine line number
	entries for the same line number.
This commit is contained in:
Peter Schauer 1993-04-16 19:29:14 +00:00
parent 95330ec393
commit e157305cd9
3 changed files with 64 additions and 17 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
Fri Apr 16 12:27:11 1993 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
* mips-tdep.c (mips_skip_prologue): Always skip the typical prologue
instructions and nothing more.
* mipsread.c (add_line): Add comment why we have to combine line number
entries for the same line number.
Fri Apr 16 09:42:03 1993 Jim Kingdon (kingdon@cygnus.com)
* symtab.{c,h}: Doc fixes (remove symseg references, last relevant

43
gdb/mips-tdep.c
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@ -87,17 +87,18 @@ read_next_frame_reg(fi, regno)
FRAME fi;
int regno;
{
#define SIGFRAME_BASE sizeof(struct sigcontext)
#define SIGFRAME_PC_OFF (-SIGFRAME_BASE+ 2*sizeof(int))
#define SIGFRAME_SP_OFF (-SIGFRAME_BASE+32*sizeof(int))
#define SIGFRAME_RA_OFF (-SIGFRAME_BASE+34*sizeof(int))
/* If it is the frame for sigtramp we have a complete sigcontext
immediately below the frame and we get the saved registers from there.
If the stack layout for sigtramp changes we might have to change these
constants and the companion fixup_sigtramp in mipsread.c */
#define SIGFRAME_BASE 0x12c /* sizeof(sigcontext) */
#define SIGFRAME_PC_OFF (-SIGFRAME_BASE + 2 * 4)
#define SIGFRAME_REGSAVE_OFF (-SIGFRAME_BASE + 3 * 4)
for (; fi; fi = fi->next)
if (in_sigtramp(fi->pc, 0)) {
/* No idea if this code works. --PB. */
int offset;
if (regno == PC_REGNUM) offset = SIGFRAME_PC_OFF;
else if (regno == RA_REGNUM) offset = SIGFRAME_RA_OFF;
else if (regno == SP_REGNUM) offset = SIGFRAME_SP_OFF;
else if (regno < 32) offset = SIGFRAME_REGSAVE_OFF + regno * 4;
else return 0;
return read_memory_integer(fi->frame + offset, 4);
}
@ -728,19 +729,32 @@ mips_skip_prologue(pc)
int offset;
int seen_sp_adjust = 0;
/* For -g modules and most functions anyways the
first instruction adjusts the stack.
But we allow some number of stores before the stack adjustment.
(These are emitted by varags functions compiled by gcc-2.0. */
/* Skip the typical prologue instructions. These are the stack adjustment
instruction and the instructions that save registers on the stack
or in the gcc frame. */
for (offset = 0; offset < 100; offset += 4) {
inst = read_memory_integer(pc + offset, 4);
if ((inst & 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
if ((inst & 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
seen_sp_adjust = 1;
else if ((inst & 0xFFE00000) == 0xAFA00000) /* sw reg,n($sp) */
else if ((inst & 0xFFE00000) == 0xAFA00000 && (inst & 0x001F0000))
continue; /* sw reg,n($sp) */
/* reg != $zero */
else if ((inst & 0xFFE00000) == 0xE7A00000) /* swc1 freg,n($sp) */
continue;
else if ((inst & 0xF3E00000) == 0xA3C00000 && (inst & 0x001F0000))
/* sx reg,n($s8) */
continue; /* reg != $zero */
else if (inst == 0x03A0F021) /* move $s8,$sp */
continue;
else
break;
break;
}
return pc + offset;
/* FIXME schauer. The following code seems no longer necessary if we
always skip the typical prologue instructions. */
#if 0
if (seen_sp_adjust)
return pc + offset;
@ -764,6 +778,7 @@ mips_skip_prologue(pc)
return pc + 4;
return pc;
#endif
}
/* Let the user turn off floating point. */

31
gdb/mipsread.c
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@ -180,6 +180,9 @@ struct complaint pdr_for_nonsymbol_complaint =
struct complaint pdr_static_symbol_complaint =
{"can't handle PDR for static proc at 0x%x", 0, 0};
struct complaint bad_setjmp_pdr_complaint =
{"fixing bad setjmp PDR from libc", 0, 0};
/* Macros and extra defs */
/* Already-parsed symbols are marked specially */
@ -1583,6 +1586,16 @@ parse_procedure (pr, have_stabs, first_off)
e->pdr = *pr;
e->pdr.isym = (long) s;
e->pdr.adr += cur_fdr->adr - first_off;
/* Correct incorrect setjmp procedure descriptor from the library
to make backtrace through setjmp work. */
if (e->pdr.pcreg == 0 && strcmp (sh_name, "setjmp") == 0)
{
complain (&bad_setjmp_pdr_complaint, 0);
e->pdr.pcreg = RA_REGNUM;
e->pdr.regmask = 0x80000000;
e->pdr.regoffset = -4;
}
}
}
@ -2824,7 +2837,18 @@ add_block (b, s)
/* Add a new linenumber entry (LINENO,ADR) to a linevector LT.
MIPS' linenumber encoding might need more than one byte
to describe it, LAST is used to detect these continuation lines */
to describe it, LAST is used to detect these continuation lines.
Combining lines with the same line number seems like a bad idea.
E.g: There could be a line number entry with the same line number after the
prologue and GDB should not ignore it (this is a better way to find
a prologue than mips_skip_prologue).
But due to the compressed line table format there are line number entries
for the same line which are needed to bridge the gap to the next
line number entry. These entries have a bogus address info with them
and we are unable to tell them from intended duplicate line number
entries.
This is another reason why -ggdb debugging format is preferable. */
static int
add_line (lt, lineno, adr, last)
@ -3170,11 +3194,12 @@ fixup_sigtramp ()
/* align_longword(sigcontext + SIGFRAME) */
e->pdr.frameoffset = 0x150;
e->pdr.framereg = SP_REGNUM;
e->pdr.pcreg = 31;
/* read_next_frame_reg provides the true pc at the time of signal */
e->pdr.pcreg = PC_REGNUM;
e->pdr.regmask = -2;
e->pdr.regoffset = -(41 * sizeof (int));
e->pdr.fregmask = -1;
e->pdr.fregoffset = -(37 * sizeof (int));
e->pdr.fregoffset = -(7 * sizeof (int));
e->pdr.isym = (long) s;
current_objfile = st->objfile; /* Keep new_symbol happy */