Boston, MA 02111-1307, USA. */
#include "defs.h"
-#include "frame.h"
#include "bfd.h"
#include "inferior.h"
-#include "value.h"
#include "regcache.h"
#include "completer.h"
-#include "language.h"
#include "osabi.h"
#include "gdb_assert.h"
-#include "infttrace.h"
#include "arch-utils.h"
/* For argument passing to the inferior */
#include "symtab.h"
-#include "infcall.h"
#include "dis-asm.h"
#include "trad-frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
-#include "gdb_stat.h"
-#include "gdb_wait.h"
-
#include "gdbcore.h"
#include "gdbcmd.h"
-#include "target.h"
-#include "symfile.h"
#include "objfiles.h"
#include "hppa-tdep.h"
#define MASK_14 0x3fff
#define MASK_21 0x1fffff
-/* Define offsets into the call dummy for the _sr4export address.
- See comments related to CALL_DUMMY for more info. */
-#define SR4EXPORT_LDIL_OFFSET (HPPA_INSTRUCTION_SIZE * 12)
-#define SR4EXPORT_LDO_OFFSET (HPPA_INSTRUCTION_SIZE * 13)
-
/* Sizes (in bytes) of the native unwind entries. */
#define UNWIND_ENTRY_SIZE 16
#define STUB_UNWIND_ENTRY_SIZE 8
the higher-ordered word is stored in the lower-ordered
argument, and even though it is a 8-byte quantity the
registers need not be 8-byte aligned. */
- if (param_len > 4)
+ if (param_len > 4 && param_len < 8)
small_struct = 1;
}
the current function (and is thus equivalent to the "saved"
stack pointer. */
CORE_ADDR this_sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
+ CORE_ADDR fp;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (this_sp=0x%s, pc=0x%s, "
paddr_nz (frame_pc_unwind (next_frame)),
paddr_nz (prologue_end));
- if (frame_pc_unwind (next_frame) >= prologue_end)
+ /* Check to see if a frame pointer is available, and use it for
+ frame unwinding if it is.
+
+ There are some situations where we need to rely on the frame
+ pointer to do stack unwinding. For example, if a function calls
+ alloca (), the stack pointer can get adjusted inside the body of
+ the function. In this case, the ABI requires that the compiler
+ maintain a frame pointer for the function.
+
+ The unwind record has a flag (alloca_frame) that indicates that
+ a function has a variable frame; unfortunately, gcc/binutils
+ does not set this flag. Instead, whenever a frame pointer is used
+ and saved on the stack, the Save_SP flag is set. We use this to
+ decide whether to use the frame pointer for unwinding.
+
+ fp should never be zero here; checking just in case.
+
+ TODO: For the HP compiler, maybe we should use the alloca_frame flag
+ instead of Save_SP. */
+
+ fp = frame_unwind_register_unsigned (next_frame, HPPA_FP_REGNUM);
+
+ if (frame_pc_unwind (next_frame) >= prologue_end
+ && u->Save_SP && fp != 0)
+ {
+ cache->base = fp;
+
+ if (hppa_debug)
+ fprintf_unfiltered (gdb_stdlog, " (base=0x%s) [frame pointer] }",
+ paddr_nz (cache->base));
+ }
+ else if (frame_pc_unwind (next_frame) >= prologue_end)
{
if (u->Save_SP && trad_frame_addr_p (cache->saved_regs, HPPA_SP_REGNUM))
{
as the return register while normal code uses "rp". */
if (u->Millicode)
{
- if (trad_frame_addr_p (cache->saved_regs, HPPA_RP_REGNUM))
+ if (trad_frame_addr_p (cache->saved_regs, 31))
cache->saved_regs[HPPA_PCOQ_HEAD_REGNUM] = cache->saved_regs[31];
else
{
hppa_fallback_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct hppa_frame_cache *cache;
+ unsigned int frame_size;
CORE_ADDR pc, start_pc, end_pc, cur_pc;
cache = FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache);
pc = frame_func_unwind (next_frame);
cur_pc = frame_pc_unwind (next_frame);
+ frame_size = 0;
find_pc_partial_function (pc, NULL, &start_pc, &end_pc);
insn = read_memory_unsigned_integer (pc, 4);
+ frame_size += prologue_inst_adjust_sp (insn);
+
/* There are limited ways to store the return pointer into the
stack. */
if (insn == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
- {
- cache->saved_regs[HPPA_RP_REGNUM].addr = -20;
- break;
- }
+ cache->saved_regs[HPPA_RP_REGNUM].addr = -20;
else if (insn == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
- {
- cache->saved_regs[HPPA_RP_REGNUM].addr = -16;
- break;
- }
+ cache->saved_regs[HPPA_RP_REGNUM].addr = -16;
}
- cache->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
+ cache->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM) - frame_size;
+ trad_frame_set_value (cache->saved_regs, HPPA_SP_REGNUM, cache->base);
if (trad_frame_addr_p (cache->saved_regs, HPPA_RP_REGNUM))
{
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct hppa_stub_unwind_cache *info;
+ struct unwind_table_entry *u;
if (*this_cache)
return *this_cache;
*this_cache = info;
info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
- info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].realreg = HPPA_RP_REGNUM;
info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
+ if (gdbarch_osabi (gdbarch) == GDB_OSABI_HPUX_SOM)
+ {
+ /* HPUX uses export stubs in function calls; the export stub clobbers
+ the return value of the caller, and, later restores it from the
+ stack. */
+ u = find_unwind_entry (frame_pc_unwind (next_frame));
+
+ if (u && u->stub_unwind.stub_type == EXPORT)
+ {
+ info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].addr = info->base - 24;
+
+ return info;
+ }
+ }
+
+ /* By default we assume that stubs do not change the rp. */
+ info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].realreg = HPPA_RP_REGNUM;
+
return info;
}
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
- if (IN_SOLIB_CALL_TRAMPOLINE (pc, NULL)
+ if (pc == 0
+ || IN_SOLIB_CALL_TRAMPOLINE (pc, NULL)
|| IN_SOLIB_RETURN_TRAMPOLINE (pc, NULL))
return &hppa_stub_frame_unwind;
return NULL;
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
- int pcoqt = (regnum == HPPA_PCOQ_TAIL_REGNUM);
- struct gdbarch *gdbarch = get_frame_arch (next_frame);
- int regsize = register_size (gdbarch, HPPA_PCOQ_HEAD_REGNUM);
+ if (regnum == HPPA_PCOQ_TAIL_REGNUM)
+ {
+ if (valuep)
+ {
+ CORE_ADDR pc;
+
+ trad_frame_prev_register (next_frame, saved_regs,
+ HPPA_PCOQ_HEAD_REGNUM, optimizedp,
+ lvalp, addrp, realnump, valuep);
- if (pcoqt)
- regnum = HPPA_PCOQ_HEAD_REGNUM;
+ pc = extract_unsigned_integer (valuep, 4);
+ store_unsigned_integer (valuep, 4, pc + 4);
+ }
+
+ /* It's a computed value. */
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ return;
+ }
trad_frame_prev_register (next_frame, saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
-
- if (pcoqt)
- store_unsigned_integer (valuep, regsize,
- extract_unsigned_integer (valuep, regsize) + 4);
}
+\f
/* Here is a table of C type sizes on hppa with various compiles
and options. I measured this on PA 9000/800 with HP-UX 11.11
&hppa_debug, "Set hppa debugging.\n\
When non-zero, hppa specific debugging is enabled.", &setdebuglist), &showdebuglist);
}
-
projects / deliverable / binutils-gdb.git / blobdiff