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From Jeffrey Law: 

* tm-hppa.h (TARGET_WRITE_PC): Define.
	* hppa-tdep.c (hppa_fix_call_dummy): If in a syscall,
	then return the address of the dummy itself rather than
	the address of $$dyncall.
	(target_write_pc): New function to store a new PC.
This commit is contained in:
Jim Kingdon 1993-07-30 20:49:52 +00:00
parent a4fbb03e2d
commit 6cfec92912
2 changed files with 37 additions and 1 deletions
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9
gdb/ChangeLog
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@ -1,3 +1,12 @@
Fri Jul 30 15:43:49 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
From Jeffrey Law:
* tm-hppa.h (TARGET_WRITE_PC): Define.
* hppa-tdep.c (hppa_fix_call_dummy): If in a syscall,
then return the address of the dummy itself rather than
the address of $$dyncall.
(target_write_pc): New function to store a new PC.
Fri Jul 30 12:51:27 1993 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
and Jim Kingdon (kingdon@cygnus.com)

29
gdb/hppa-tdep.c
View File

@ -817,6 +817,7 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
{
CORE_ADDR dyncall_addr, sr4export_addr;
struct minimal_symbol *msymbol;
int flags = read_register (FLAGS_REGNUM);
msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL);
if (msymbol == NULL)
@ -837,7 +838,16 @@ hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
write_register (22, pc);
return dyncall_addr;
/* If we are in a syscall, then we should call the stack dummy
directly. $$dyncall is not needed as the kernel sets up the
space id registers properly based on the value in %r31. In
fact calling $$dyncall will not work because the value in %r22
will be clobbered on the syscall exit path. */
if (flags & 2)
return pc;
else
return dyncall_addr;
}
/* Get the PC from %r31 if currently in a syscall. Also mask out privilege
@ -852,6 +862,23 @@ target_read_pc ()
return read_register (PC_REGNUM) & ~0x3;
}
/* Write out the PC. If currently in a syscall, then also write the new
PC value into %r31. */
void
target_write_pc (v)
CORE_ADDR v;
{
int flags = read_register (FLAGS_REGNUM);
/* If in a syscall, then set %r31. Also make sure to get the
privilege bits set correctly. */
if (flags & 2)
write_register (31, (long) (v | 0x3));
write_register (PC_REGNUM, (long) v);
write_register (NPC_REGNUM, (long) v + 4);
}
/* return the alignment of a type in bytes. Structures have the maximum
alignment required by their fields. */