/* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
- Copyright 1993, 1994 Free Software Foundation, Inc.
+ Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "dis-asm.h"
#include "symfile.h"
#include "objfiles.h"
+#include "gdb_string.h"
+#include "linespec.h"
+#include "regcache.h"
+#include "doublest.h"
+
+struct frame_extra_info
+ {
+ alpha_extra_func_info_t proc_desc;
+ int localoff;
+ int pc_reg;
+ };
/* FIXME: Some of this code should perhaps be merged with mips-tdep.c. */
-/* FIXME: Put this declaration in frame.h. */
-extern struct obstack frame_cache_obstack;
-\f
+/* Prototypes for local functions. */
-/* Forward declarations. */
+static void alpha_find_saved_regs (struct frame_info *);
-static CORE_ADDR
-read_next_frame_reg PARAMS ((FRAME, int));
+static alpha_extra_func_info_t push_sigtramp_desc (CORE_ADDR low_addr);
-static CORE_ADDR
-heuristic_proc_start PARAMS ((CORE_ADDR));
+static CORE_ADDR read_next_frame_reg (struct frame_info *, int);
-static alpha_extra_func_info_t
-heuristic_proc_desc PARAMS ((CORE_ADDR, CORE_ADDR, FRAME));
+static CORE_ADDR heuristic_proc_start (CORE_ADDR);
-static alpha_extra_func_info_t
-find_proc_desc PARAMS ((CORE_ADDR, FRAME));
+static alpha_extra_func_info_t heuristic_proc_desc (CORE_ADDR,
+ CORE_ADDR,
+ struct frame_info *);
-static int
-alpha_in_lenient_prologue PARAMS ((CORE_ADDR, CORE_ADDR));
+static alpha_extra_func_info_t find_proc_desc (CORE_ADDR,
+ struct frame_info *);
-static void
-reinit_frame_cache_sfunc PARAMS ((char *, int, struct cmd_list_element *));
+#if 0
+static int alpha_in_lenient_prologue (CORE_ADDR, CORE_ADDR);
+#endif
-static CORE_ADDR after_prologue PARAMS ((CORE_ADDR pc,
- alpha_extra_func_info_t proc_desc));
+static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *);
-static int in_prologue PARAMS ((CORE_ADDR pc,
- alpha_extra_func_info_t proc_desc));
+static CORE_ADDR after_prologue (CORE_ADDR pc,
+ alpha_extra_func_info_t proc_desc);
+
+static int alpha_in_prologue (CORE_ADDR pc,
+ alpha_extra_func_info_t proc_desc);
+
+static int alpha_about_to_return (CORE_ADDR pc);
+
+void _initialize_alpha_tdep (void);
/* Heuristic_proc_start may hunt through the text section for a long
time across a 2400 baud serial line. Allows the user to limit this
search. */
static unsigned int heuristic_fence_post = 0;
-
+/* *INDENT-OFF* */
/* Layout of a stack frame on the alpha:
| |
-------------|-------------------------------|<-- sp
| |
*/
+/* *INDENT-ON* */
+
-#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
-#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
-#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.iopt) /* frame for CALL_DUMMY */
+
+#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
+/* These next two fields are kind of being hijacked. I wonder if
+ iline is too small for the values it needs to hold, if GDB is
+ running on a 32-bit host. */
+#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
+#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */
#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
struct linked_proc_info
+ {
+ struct alpha_extra_func_info info;
+ struct linked_proc_info *next;
+ }
+ *linked_proc_desc_table = NULL;
+\f
+int
+alpha_osf_in_sigtramp (CORE_ADDR pc, char *func_name)
+{
+ return (func_name != NULL && STREQ ("__sigtramp", func_name));
+}
+
+/* Under GNU/Linux, signal handler invocations can be identified by the
+ designated code sequence that is used to return from a signal
+ handler. In particular, the return address of a signal handler
+ points to the following sequence (the first instruction is quadword
+ aligned):
+
+ bis $30,$30,$16
+ addq $31,0x67,$0
+ call_pal callsys
+
+ Each instruction has a unique encoding, so we simply attempt to
+ match the instruction the pc is pointing to with any of the above
+ instructions. If there is a hit, we know the offset to the start
+ of the designated sequence and can then check whether we really are
+ executing in a designated sequence. If not, -1 is returned,
+ otherwise the offset from the start of the desingated sequence is
+ returned.
+
+ There is a slight chance of false hits: code could jump into the
+ middle of the designated sequence, in which case there is no
+ guarantee that we are in the middle of a sigreturn syscall. Don't
+ think this will be a problem in praxis, though.
+ */
+
+#ifndef TM_LINUXALPHA_H
+/* HACK: Provide a prototype when compiling this file for non
+ linuxalpha targets. */
+long alpha_linux_sigtramp_offset (CORE_ADDR pc);
+#endif
+long
+alpha_linux_sigtramp_offset (CORE_ADDR pc)
+{
+ unsigned int i[3], w;
+ long off;
+
+ if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
+ return -1;
+
+ off = -1;
+ switch (w)
+ {
+ case 0x47de0410:
+ off = 0;
+ break; /* bis $30,$30,$16 */
+ case 0x43ecf400:
+ off = 4;
+ break; /* addq $31,0x67,$0 */
+ case 0x00000083:
+ off = 8;
+ break; /* call_pal callsys */
+ default:
+ return -1;
+ }
+ pc -= off;
+ if (pc & 0x7)
+ {
+ /* designated sequence is not quadword aligned */
+ return -1;
+ }
+
+ if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
+ return -1;
+
+ if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
+ return off;
+
+ return -1;
+}
+\f
+
+/* Under OSF/1, the __sigtramp routine is frameless and has a frame
+ size of zero, but we are able to backtrace through it. */
+CORE_ADDR
+alpha_osf_skip_sigtramp_frame (struct frame_info *frame, CORE_ADDR pc)
{
- struct alpha_extra_func_info info;
- struct linked_proc_info *next;
-} *linked_proc_desc_table = NULL;
+ char *name;
+ find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
+ if (IN_SIGTRAMP (pc, name))
+ return frame->frame;
+ else
+ return 0;
+}
+\f
+/* Dynamically create a signal-handler caller procedure descriptor for
+ the signal-handler return code starting at address LOW_ADDR. The
+ descriptor is added to the linked_proc_desc_table. */
+
+static alpha_extra_func_info_t
+push_sigtramp_desc (CORE_ADDR low_addr)
+{
+ struct linked_proc_info *link;
+ alpha_extra_func_info_t proc_desc;
+
+ link = (struct linked_proc_info *)
+ xmalloc (sizeof (struct linked_proc_info));
+ link->next = linked_proc_desc_table;
+ linked_proc_desc_table = link;
+
+ proc_desc = &link->info;
+
+ proc_desc->numargs = 0;
+ PROC_LOW_ADDR (proc_desc) = low_addr;
+ PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4;
+ PROC_DUMMY_FRAME (proc_desc) = 0;
+ PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */
+ PROC_FRAME_REG (proc_desc) = SP_REGNUM;
+ PROC_REG_MASK (proc_desc) = 0xffff;
+ PROC_FREG_MASK (proc_desc) = 0xffff;
+ PROC_PC_REG (proc_desc) = 26;
+ PROC_LOCALOFF (proc_desc) = 0;
+ SET_PROC_DESC_IS_DYN_SIGTRAMP (proc_desc);
+ return (proc_desc);
+}
\f
-/* Guaranteed to set fci->saved_regs to some values (it never leaves it
+
+char *
+alpha_register_name (int regno)
+{
+ static char *register_names[] =
+ {
+ "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",
+ "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",
+ "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9",
+ "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero",
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
+ "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
+ "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr",
+ "pc", "vfp",
+ };
+
+ if (regno < 0)
+ return (NULL);
+ if (regno >= (sizeof(register_names) / sizeof(*register_names)))
+ return (NULL);
+ return (register_names[regno]);
+}
+
+int
+alpha_cannot_fetch_register (int regno)
+{
+ return (regno == FP_REGNUM || regno == ZERO_REGNUM);
+}
+
+int
+alpha_cannot_store_register (int regno)
+{
+ return (regno == FP_REGNUM || regno == ZERO_REGNUM);
+}
+
+int
+alpha_register_convertible (int regno)
+{
+ return (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31);
+}
+
+struct type *
+alpha_register_virtual_type (int regno)
+{
+ return ((regno >= FP0_REGNUM && regno < (FP0_REGNUM+31))
+ ? builtin_type_double : builtin_type_long);
+}
+
+int
+alpha_register_byte (int regno)
+{
+ return (regno * 8);
+}
+
+int
+alpha_register_raw_size (int regno)
+{
+ return 8;
+}
+
+int
+alpha_register_virtual_size (int regno)
+{
+ return 8;
+}
+\f
+
+/* Guaranteed to set frame->saved_regs to some values (it never leaves it
NULL). */
-void
-alpha_find_saved_regs (fci)
- FRAME fci;
+static void
+alpha_find_saved_regs (struct frame_info *frame)
{
int ireg;
CORE_ADDR reg_position;
alpha_extra_func_info_t proc_desc;
int returnreg;
- fci->saved_regs = (struct frame_saved_regs *)
- obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
- memset (fci->saved_regs, 0, sizeof (struct frame_saved_regs));
+ frame_saved_regs_zalloc (frame);
- proc_desc = fci->proc_desc;
+ /* If it is the frame for __sigtramp, the saved registers are located
+ in a sigcontext structure somewhere on the stack. __sigtramp
+ passes a pointer to the sigcontext structure on the stack.
+ If the stack layout for __sigtramp changes, or if sigcontext offsets
+ change, we might have to update this code. */
+#ifndef SIGFRAME_PC_OFF
+#define SIGFRAME_PC_OFF (2 * 8)
+#define SIGFRAME_REGSAVE_OFF (4 * 8)
+#define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
+#endif
+ if (frame->signal_handler_caller)
+ {
+ CORE_ADDR sigcontext_addr;
+
+ sigcontext_addr = SIGCONTEXT_ADDR (frame);
+ for (ireg = 0; ireg < 32; ireg++)
+ {
+ reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8;
+ frame->saved_regs[ireg] = reg_position;
+ }
+ for (ireg = 0; ireg < 32; ireg++)
+ {
+ reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8;
+ frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
+ }
+ frame->saved_regs[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF;
+ return;
+ }
+
+ proc_desc = frame->extra_info->proc_desc;
if (proc_desc == NULL)
/* I'm not sure how/whether this can happen. Normally when we can't
find a proc_desc, we "synthesize" one using heuristic_proc_desc
/* Fill in the offsets for the registers which gen_mask says
were saved. */
- reg_position = fci->frame + PROC_REG_OFFSET (proc_desc);
+ reg_position = frame->frame + PROC_REG_OFFSET (proc_desc);
mask = PROC_REG_MASK (proc_desc);
returnreg = PROC_PC_REG (proc_desc);
- /* Note that RA is always saved first, regardless of it's actual
+ /* Note that RA is always saved first, regardless of its actual
register number. */
if (mask & (1 << returnreg))
{
- fci->saved_regs->regs[returnreg] = reg_position;
+ frame->saved_regs[returnreg] = reg_position;
reg_position += 8;
- mask &= ~(1 << returnreg); /* Clear bit for RA so we
- don't save again later. */
+ mask &= ~(1 << returnreg); /* Clear bit for RA so we
+ don't save again later. */
}
- for (ireg = 0; ireg <= 31 ; ++ireg)
+ for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
- fci->saved_regs->regs[ireg] = reg_position;
+ frame->saved_regs[ireg] = reg_position;
reg_position += 8;
}
/* Fill in the offsets for the registers which float_mask says
were saved. */
- reg_position = fci->frame + PROC_FREG_OFFSET (proc_desc);
+ reg_position = frame->frame + PROC_FREG_OFFSET (proc_desc);
mask = PROC_FREG_MASK (proc_desc);
- for (ireg = 0; ireg <= 31 ; ++ireg)
+ for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
- fci->saved_regs->regs[FP0_REGNUM+ireg] = reg_position;
+ frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
reg_position += 8;
}
- fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[returnreg];
+ frame->saved_regs[PC_REGNUM] = frame->saved_regs[returnreg];
+}
+
+void
+alpha_frame_init_saved_regs (struct frame_info *fi)
+{
+ if (fi->saved_regs == NULL)
+ alpha_find_saved_regs (fi);
+ fi->saved_regs[SP_REGNUM] = fi->frame;
+}
+
+void
+alpha_init_frame_pc_first (int fromleaf, struct frame_info *prev)
+{
+ prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) :
+ prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
}
static CORE_ADDR
-read_next_frame_reg(fi, regno)
- FRAME fi;
- int regno;
+read_next_frame_reg (struct frame_info *fi, int regno)
{
- /* If it is the frame for sigtramp we have a pointer to the sigcontext
- on the stack.
- If the stack layout for __sigtramp changes or if sigcontext offsets
- change we might have to update this code. */
-#ifndef SIGFRAME_PC_OFF
-#define SIGFRAME_PC_OFF (2 * 8)
-#define SIGFRAME_REGSAVE_OFF (4 * 8)
-#endif
for (; fi; fi = fi->next)
{
- if (fi->signal_handler_caller)
- {
- int offset;
- CORE_ADDR sigcontext_addr = read_memory_integer(fi->frame, 8);
-
- if (regno == PC_REGNUM)
- offset = SIGFRAME_PC_OFF;
- else if (regno < 32)
- offset = SIGFRAME_REGSAVE_OFF + regno * 8;
- else
- return 0;
- return read_memory_integer(sigcontext_addr + offset, 8);
- }
- else if (regno == SP_REGNUM)
+ /* We have to get the saved sp from the sigcontext
+ if it is a signal handler frame. */
+ if (regno == SP_REGNUM && !fi->signal_handler_caller)
return fi->frame;
else
{
if (fi->saved_regs == NULL)
alpha_find_saved_regs (fi);
- if (fi->saved_regs->regs[regno])
- return read_memory_integer(fi->saved_regs->regs[regno], 8);
+ if (fi->saved_regs[regno])
+ return read_memory_integer (fi->saved_regs[regno], 8);
}
}
- return read_register(regno);
+ return read_register (regno);
}
CORE_ADDR
-alpha_frame_saved_pc(frame)
- FRAME frame;
+alpha_frame_saved_pc (struct frame_info *frame)
{
- alpha_extra_func_info_t proc_desc = frame->proc_desc;
+ alpha_extra_func_info_t proc_desc = frame->extra_info->proc_desc;
/* We have to get the saved pc from the sigcontext
if it is a signal handler frame. */
int pcreg = frame->signal_handler_caller ? PC_REGNUM
- : (proc_desc ? PROC_PC_REG(proc_desc) : RA_REGNUM);
+ : frame->extra_info->pc_reg;
- if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
- return read_memory_integer(frame->frame - 8, 8);
+ if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc))
+ return read_memory_integer (frame->frame - 8, 8);
- return read_next_frame_reg(frame, pcreg);
+ return read_next_frame_reg (frame, pcreg);
}
CORE_ADDR
-alpha_saved_pc_after_call (frame)
- FRAME frame;
+alpha_saved_pc_after_call (struct frame_info *frame)
{
- alpha_extra_func_info_t proc_desc = find_proc_desc (frame->pc, frame->next);
- int pcreg = proc_desc ? PROC_PC_REG (proc_desc) : RA_REGNUM;
+ CORE_ADDR pc = frame->pc;
+ CORE_ADDR tmp;
+ alpha_extra_func_info_t proc_desc;
+ int pcreg;
+
+ /* Skip over shared library trampoline if necessary. */
+ tmp = SKIP_TRAMPOLINE_CODE (pc);
+ if (tmp != 0)
+ pc = tmp;
- return read_register (pcreg);
+ proc_desc = find_proc_desc (pc, frame->next);
+ pcreg = proc_desc ? PROC_PC_REG (proc_desc) : RA_REGNUM;
+
+ if (frame->signal_handler_caller)
+ return alpha_frame_saved_pc (frame);
+ else
+ return read_register (pcreg);
}
static struct alpha_extra_func_info temp_proc_desc;
-static struct frame_saved_regs temp_saved_regs;
+static CORE_ADDR temp_saved_regs[NUM_REGS];
+
+/* Nonzero if instruction at PC is a return instruction. "ret
+ $zero,($ra),1" on alpha. */
+
+static int
+alpha_about_to_return (CORE_ADDR pc)
+{
+ return read_memory_integer (pc, 4) == 0x6bfa8001;
+}
+
+
/* This fencepost looks highly suspicious to me. Removing it also
seems suspicious as it could affect remote debugging across serial
lines. */
static CORE_ADDR
-heuristic_proc_start(pc)
- CORE_ADDR pc;
+heuristic_proc_start (CORE_ADDR pc)
{
- CORE_ADDR start_pc = pc;
- CORE_ADDR fence = start_pc - heuristic_fence_post;
+ CORE_ADDR start_pc = pc;
+ CORE_ADDR fence = start_pc - heuristic_fence_post;
- if (start_pc == 0) return 0;
+ if (start_pc == 0)
+ return 0;
- if (heuristic_fence_post == UINT_MAX
- || fence < VM_MIN_ADDRESS)
- fence = VM_MIN_ADDRESS;
+ if (heuristic_fence_post == UINT_MAX
+ || fence < VM_MIN_ADDRESS)
+ fence = VM_MIN_ADDRESS;
- /* search back for previous return */
- for (start_pc -= 4; ; start_pc -= 4)
- if (start_pc < fence)
+ /* search back for previous return */
+ for (start_pc -= 4;; start_pc -= 4)
+ if (start_pc < fence)
+ {
+ /* It's not clear to me why we reach this point when
+ stop_soon_quietly, but with this test, at least we
+ don't print out warnings for every child forked (eg, on
+ decstation). 22apr93 rich@cygnus.com. */
+ if (!stop_soon_quietly)
{
- /* It's not clear to me why we reach this point when
- stop_soon_quietly, but with this test, at least we
- don't print out warnings for every child forked (eg, on
- decstation). 22apr93 rich@cygnus.com. */
- if (!stop_soon_quietly)
+ static int blurb_printed = 0;
+
+ if (fence == VM_MIN_ADDRESS)
+ warning ("Hit beginning of text section without finding");
+ else
+ warning ("Hit heuristic-fence-post without finding");
+
+ warning ("enclosing function for address 0x%s", paddr_nz (pc));
+ if (!blurb_printed)
{
- static int blurb_printed = 0;
-
- if (fence == VM_MIN_ADDRESS)
- warning("Hit beginning of text section without finding");
- else
- warning("Hit heuristic-fence-post without finding");
-
- warning("enclosing function for address 0x%lx", pc);
- if (!blurb_printed)
- {
- printf_filtered ("\
+ printf_filtered ("\
This warning occurs if you are debugging a function without any symbols\n\
(for example, in a stripped executable). In that case, you may wish to\n\
increase the size of the search with the `set heuristic-fence-post' command.\n\
\n\
Otherwise, you told GDB there was a function where there isn't one, or\n\
(more likely) you have encountered a bug in GDB.\n");
- blurb_printed = 1;
- }
+ blurb_printed = 1;
}
-
- return 0;
}
- else if (ABOUT_TO_RETURN(start_pc))
- break;
- start_pc += 4; /* skip return */
- return start_pc;
+ return 0;
+ }
+ else if (alpha_about_to_return (start_pc))
+ break;
+
+ start_pc += 4; /* skip return */
+ return start_pc;
}
static alpha_extra_func_info_t
-heuristic_proc_desc(start_pc, limit_pc, next_frame)
- CORE_ADDR start_pc, limit_pc;
- FRAME next_frame;
+heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct frame_info *next_frame)
{
- CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
- CORE_ADDR cur_pc;
- int frame_size;
- int has_frame_reg = 0;
- unsigned long reg_mask = 0;
-
- if (start_pc == 0)
- return NULL;
- memset(&temp_proc_desc, '\0', sizeof(temp_proc_desc));
- memset(&temp_saved_regs, '\0', sizeof(struct frame_saved_regs));
- PROC_LOW_ADDR(&temp_proc_desc) = start_pc;
-
- if (start_pc + 200 < limit_pc)
- limit_pc = start_pc + 200;
- frame_size = 0;
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
- {
- char buf[4];
- unsigned long word;
- int status;
-
- status = read_memory_nobpt (cur_pc, buf, 4);
- if (status)
- memory_error (status, cur_pc);
- word = extract_unsigned_integer (buf, 4);
-
- if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- frame_size += (-word) & 0xffff;
- else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
- && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
- {
- int reg = (word & 0x03e00000) >> 21;
- reg_mask |= 1 << reg;
- temp_saved_regs.regs[reg] = sp + (short)word;
- }
- else if (word == 0x47de040f) /* bis sp,sp fp */
- has_frame_reg = 1;
- }
- if (has_frame_reg)
- PROC_FRAME_REG(&temp_proc_desc) = GCC_FP_REGNUM;
- else
- PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
- PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
- PROC_REG_MASK(&temp_proc_desc) = reg_mask;
- PROC_PC_REG(&temp_proc_desc) = RA_REGNUM;
- PROC_LOCALOFF(&temp_proc_desc) = 0; /* XXX - bogus */
- return &temp_proc_desc;
+ CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
+ CORE_ADDR cur_pc;
+ int frame_size;
+ int has_frame_reg = 0;
+ unsigned long reg_mask = 0;
+ int pcreg = -1;
+
+ if (start_pc == 0)
+ return NULL;
+ memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
+ memset (&temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS);
+ PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
+
+ if (start_pc + 200 < limit_pc)
+ limit_pc = start_pc + 200;
+ frame_size = 0;
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
+ {
+ char buf[4];
+ unsigned long word;
+ int status;
+
+ status = read_memory_nobpt (cur_pc, buf, 4);
+ if (status)
+ memory_error (status, cur_pc);
+ word = extract_unsigned_integer (buf, 4);
+
+ if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ {
+ if (word & 0x8000)
+ frame_size += (-word) & 0xffff;
+ else
+ /* Exit loop if a positive stack adjustment is found, which
+ usually means that the stack cleanup code in the function
+ epilogue is reached. */
+ break;
+ }
+ else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ {
+ int reg = (word & 0x03e00000) >> 21;
+ reg_mask |= 1 << reg;
+ temp_saved_regs[reg] = sp + (short) word;
+
+ /* Starting with OSF/1-3.2C, the system libraries are shipped
+ without local symbols, but they still contain procedure
+ descriptors without a symbol reference. GDB is currently
+ unable to find these procedure descriptors and uses
+ heuristic_proc_desc instead.
+ As some low level compiler support routines (__div*, __add*)
+ use a non-standard return address register, we have to
+ add some heuristics to determine the return address register,
+ or stepping over these routines will fail.
+ Usually the return address register is the first register
+ saved on the stack, but assembler optimization might
+ rearrange the register saves.
+ So we recognize only a few registers (t7, t9, ra) within
+ the procedure prologue as valid return address registers.
+ If we encounter a return instruction, we extract the
+ the return address register from it.
+
+ FIXME: Rewriting GDB to access the procedure descriptors,
+ e.g. via the minimal symbol table, might obviate this hack. */
+ if (pcreg == -1
+ && cur_pc < (start_pc + 80)
+ && (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM))
+ pcreg = reg;
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ pcreg = (word >> 16) & 0x1f;
+ else if (word == 0x47de040f) /* bis sp,sp fp */
+ has_frame_reg = 1;
+ }
+ if (pcreg == -1)
+ {
+ /* If we haven't found a valid return address register yet,
+ keep searching in the procedure prologue. */
+ while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
+ {
+ char buf[4];
+ unsigned long word;
+
+ if (read_memory_nobpt (cur_pc, buf, 4))
+ break;
+ cur_pc += 4;
+ word = extract_unsigned_integer (buf, 4);
+
+ if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ {
+ int reg = (word & 0x03e00000) >> 21;
+ if (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM)
+ {
+ pcreg = reg;
+ break;
+ }
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ {
+ pcreg = (word >> 16) & 0x1f;
+ break;
+ }
+ }
+ }
+
+ if (has_frame_reg)
+ PROC_FRAME_REG (&temp_proc_desc) = GCC_FP_REGNUM;
+ else
+ PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
+ PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size;
+ PROC_REG_MASK (&temp_proc_desc) = reg_mask;
+ PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? RA_REGNUM : pcreg;
+ PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */
+ return &temp_proc_desc;
}
/* This returns the PC of the first inst after the prologue. If we can't
find the prologue, then return 0. */
static CORE_ADDR
-after_prologue (pc, proc_desc)
- CORE_ADDR pc;
- alpha_extra_func_info_t proc_desc;
+after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
{
- struct block *b;
struct symtab_and_line sal;
CORE_ADDR func_addr, func_end;
if (proc_desc)
{
+ if (PROC_DESC_IS_DYN_SIGTRAMP (proc_desc))
+ return PROC_LOW_ADDR (proc_desc); /* "prologue" is in kernel */
+
/* If function is frameless, then we need to do it the hard way. I
- strongly suspect that frameless always means prologueless... */
+ strongly suspect that frameless always means prologueless... */
if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
&& PROC_FRAME_OFFSET (proc_desc) == 0)
return 0;
}
/* Return non-zero if we *might* be in a function prologue. Return zero if we
- are definatly *not* in a function prologue. */
+ are definitively *not* in a function prologue. */
static int
-in_prologue (pc, proc_desc)
- CORE_ADDR pc;
- alpha_extra_func_info_t proc_desc;
+alpha_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
{
CORE_ADDR after_prologue_pc;
}
static alpha_extra_func_info_t
-find_proc_desc(pc, next_frame)
- CORE_ADDR pc;
- FRAME next_frame;
+find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame)
{
alpha_extra_func_info_t proc_desc;
struct block *b;
return found_proc_desc;
}
- b = block_for_pc(pc);
+ b = block_for_pc (pc);
find_pc_partial_function (pc, NULL, &startaddr, NULL);
if (b == NULL)
0, NULL);
}
+ /* If we never found a PDR for this function in symbol reading, then
+ examine prologues to find the information. */
+ if (sym && ((mips_extra_func_info_t) SYMBOL_VALUE (sym))->pdr.framereg == -1)
+ sym = NULL;
+
if (sym)
{
- /* IF this is the topmost frame AND
- * (this proc does not have debugging information OR
- * the PC is in the procedure prologue)
- * THEN create a "heuristic" proc_desc (by analyzing
- * the actual code) to replace the "official" proc_desc.
- */
- proc_desc = (alpha_extra_func_info_t)SYMBOL_VALUE(sym);
- if (next_frame == NULL)
- {
- if (PROC_DESC_IS_DUMMY (proc_desc) || in_prologue (pc, proc_desc))
- {
- alpha_extra_func_info_t found_heuristic =
- heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
- pc, next_frame);
- PROC_LOCALOFF (found_heuristic) = PROC_LOCALOFF (proc_desc);
- if (found_heuristic)
+ /* IF this is the topmost frame AND
+ * (this proc does not have debugging information OR
+ * the PC is in the procedure prologue)
+ * THEN create a "heuristic" proc_desc (by analyzing
+ * the actual code) to replace the "official" proc_desc.
+ */
+ proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym);
+ if (next_frame == NULL)
+ {
+ if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc))
+ {
+ alpha_extra_func_info_t found_heuristic =
+ heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
+ pc, next_frame);
+ if (found_heuristic)
+ {
+ PROC_LOCALOFF (found_heuristic) =
+ PROC_LOCALOFF (proc_desc);
+ PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
proc_desc = found_heuristic;
- }
- }
+ }
+ }
+ }
}
else
{
+ long offset;
+
/* Is linked_proc_desc_table really necessary? It only seems to be used
- by procedure call dummys. However, the procedures being called ought
- to have their own proc_descs, and even if they don't,
- heuristic_proc_desc knows how to create them! */
+ by procedure call dummys. However, the procedures being called ought
+ to have their own proc_descs, and even if they don't,
+ heuristic_proc_desc knows how to create them! */
register struct linked_proc_info *link;
for (link = linked_proc_desc_table; link; link = link->next)
- if (PROC_LOW_ADDR(&link->info) <= pc
- && PROC_HIGH_ADDR(&link->info) > pc)
- return &link->info;
-
- if (startaddr == 0)
+ if (PROC_LOW_ADDR (&link->info) <= pc
+ && PROC_HIGH_ADDR (&link->info) > pc)
+ return &link->info;
+
+ /* If PC is inside a dynamically generated sigtramp handler,
+ create and push a procedure descriptor for that code: */
+ offset = DYNAMIC_SIGTRAMP_OFFSET (pc);
+ if (offset >= 0)
+ return push_sigtramp_desc (pc - offset);
+
+ /* If heuristic_fence_post is non-zero, determine the procedure
+ start address by examining the instructions.
+ This allows us to find the start address of static functions which
+ have no symbolic information, as startaddr would have been set to
+ the preceding global function start address by the
+ find_pc_partial_function call above. */
+ if (startaddr == 0 || heuristic_fence_post != 0)
startaddr = heuristic_proc_start (pc);
proc_desc =
alpha_extra_func_info_t cached_proc_desc;
-FRAME_ADDR
-alpha_frame_chain(frame)
- FRAME frame;
+CORE_ADDR
+alpha_frame_chain (struct frame_info *frame)
{
- alpha_extra_func_info_t proc_desc;
- CORE_ADDR saved_pc = FRAME_SAVED_PC(frame);
-
- if (saved_pc == 0 || inside_entry_file (saved_pc))
- return 0;
-
- proc_desc = find_proc_desc(saved_pc, frame);
- if (!proc_desc)
- return 0;
-
- cached_proc_desc = proc_desc;
-
- /* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY(proc_desc))
- return (FRAME_ADDR) PROC_DUMMY_FRAME(proc_desc);
-
- /* If no frame pointer and frame size is zero, we must be at end
- of stack (or otherwise hosed). If we don't check frame size,
- we loop forever if we see a zero size frame. */
- if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0
- /* The previous frame from a sigtramp frame might be frameless
- and have frame size zero. */
- && !frame->signal_handler_caller)
- {
- /* The alpha __sigtramp routine is frameless and has a frame size
- of zero, but we are able to backtrace through it. */
- char *name;
- find_pc_partial_function (saved_pc, &name,
- (CORE_ADDR *)NULL, (CORE_ADDR *)NULL);
- if (IN_SIGTRAMP (saved_pc, name))
- return frame->frame;
- else
- return 0;
- }
- else
- return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
- + PROC_FRAME_OFFSET(proc_desc);
+ alpha_extra_func_info_t proc_desc;
+ CORE_ADDR saved_pc = FRAME_SAVED_PC (frame);
+
+ if (saved_pc == 0 || inside_entry_file (saved_pc))
+ return 0;
+
+ proc_desc = find_proc_desc (saved_pc, frame);
+ if (!proc_desc)
+ return 0;
+
+ cached_proc_desc = proc_desc;
+
+ /* Fetch the frame pointer for a dummy frame from the procedure
+ descriptor. */
+ if (PROC_DESC_IS_DUMMY (proc_desc))
+ return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
+
+ /* If no frame pointer and frame size is zero, we must be at end
+ of stack (or otherwise hosed). If we don't check frame size,
+ we loop forever if we see a zero size frame. */
+ if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
+ && PROC_FRAME_OFFSET (proc_desc) == 0
+ /* The previous frame from a sigtramp frame might be frameless
+ and have frame size zero. */
+ && !frame->signal_handler_caller)
+ return FRAME_PAST_SIGTRAMP_FRAME (frame, saved_pc);
+ else
+ return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc))
+ + PROC_FRAME_OFFSET (proc_desc);
}
void
-init_extra_frame_info(fci)
- struct frame_info *fci;
+alpha_print_extra_frame_info (struct frame_info *fi)
+{
+ if (fi
+ && fi->extra_info
+ && fi->extra_info->proc_desc
+ && fi->extra_info->proc_desc->pdr.framereg < NUM_REGS)
+ printf_filtered (" frame pointer is at %s+%s\n",
+ REGISTER_NAME (fi->extra_info->proc_desc->pdr.framereg),
+ paddr_d (fi->extra_info->proc_desc->pdr.frameoffset));
+}
+
+void
+alpha_init_extra_frame_info (int fromleaf, struct frame_info *frame)
{
/* Use proc_desc calculated in frame_chain */
alpha_extra_func_info_t proc_desc =
- fci->next ? cached_proc_desc : find_proc_desc(fci->pc, fci->next);
+ frame->next ? cached_proc_desc : find_proc_desc (frame->pc, frame->next);
+
+ frame->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
- fci->saved_regs = NULL;
- fci->proc_desc =
- proc_desc == &temp_proc_desc ? 0 : proc_desc;
+ frame->saved_regs = NULL;
+ frame->extra_info->localoff = 0;
+ frame->extra_info->pc_reg = RA_REGNUM;
+ frame->extra_info->proc_desc = proc_desc == &temp_proc_desc ? 0 : proc_desc;
if (proc_desc)
{
- /* Get the locals offset from the procedure descriptor, it is valid
- even if we are in the middle of the prologue. */
- fci->localoff = PROC_LOCALOFF(proc_desc);
+ /* Get the locals offset and the saved pc register from the
+ procedure descriptor, they are valid even if we are in the
+ middle of the prologue. */
+ frame->extra_info->localoff = PROC_LOCALOFF (proc_desc);
+ frame->extra_info->pc_reg = PROC_PC_REG (proc_desc);
/* Fixup frame-pointer - only needed for top frame */
/* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY(proc_desc))
- fci->frame = (FRAME_ADDR) PROC_DUMMY_FRAME(proc_desc);
+ descriptor. */
+ if (PROC_DESC_IS_DUMMY (proc_desc))
+ frame->frame = (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
/* This may not be quite right, if proc has a real frame register.
- Get the value of the frame relative sp, procedure might have been
- interrupted by a signal at it's very start. */
- else if (fci->pc == PROC_LOW_ADDR (proc_desc) && !PROC_DESC_IS_DUMMY (proc_desc))
- fci->frame = read_next_frame_reg (fci->next, SP_REGNUM);
+ Get the value of the frame relative sp, procedure might have been
+ interrupted by a signal at it's very start. */
+ else if (frame->pc == PROC_LOW_ADDR (proc_desc)
+ && !PROC_DESC_IS_DYN_SIGTRAMP (proc_desc))
+ frame->frame = read_next_frame_reg (frame->next, SP_REGNUM);
else
- fci->frame = read_next_frame_reg (fci->next, PROC_FRAME_REG (proc_desc))
- + PROC_FRAME_OFFSET (proc_desc);
+ frame->frame = read_next_frame_reg (frame->next, PROC_FRAME_REG (proc_desc))
+ + PROC_FRAME_OFFSET (proc_desc);
if (proc_desc == &temp_proc_desc)
{
- fci->saved_regs = (struct frame_saved_regs*)
- obstack_alloc (&frame_cache_obstack,
- sizeof (struct frame_saved_regs));
- *fci->saved_regs = temp_saved_regs;
- fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
+ char *name;
+
+ /* Do not set the saved registers for a sigtramp frame,
+ alpha_find_saved_registers will do that for us.
+ We can't use frame->signal_handler_caller, it is not yet set. */
+ find_pc_partial_function (frame->pc, &name,
+ (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
+ if (!IN_SIGTRAMP (frame->pc, name))
+ {
+ frame->saved_regs = (CORE_ADDR *)
+ frame_obstack_alloc (SIZEOF_FRAME_SAVED_REGS);
+ memcpy (frame->saved_regs, temp_saved_regs,
+ SIZEOF_FRAME_SAVED_REGS);
+ frame->saved_regs[PC_REGNUM]
+ = frame->saved_regs[RA_REGNUM];
+ }
}
}
}
+CORE_ADDR
+alpha_frame_locals_address (struct frame_info *fi)
+{
+ return (fi->frame - fi->extra_info->localoff);
+}
+
+CORE_ADDR
+alpha_frame_args_address (struct frame_info *fi)
+{
+ return (fi->frame - (ALPHA_NUM_ARG_REGS * 8));
+}
+
/* ALPHA stack frames are almost impenetrable. When execution stops,
we basically have to look at symbol information for the function
that we stopped in, which tells us *which* register (if any) is
cache. This allows the rest of info frame to extract the important
arguments without difficulty. */
-FRAME
-setup_arbitrary_frame (argc, argv)
- int argc;
- FRAME_ADDR *argv;
+struct frame_info *
+setup_arbitrary_frame (int argc, CORE_ADDR *argv)
{
if (argc != 2)
error ("ALPHA frame specifications require two arguments: sp and pc");
structure to be returned is passed as a hidden first argument. */
CORE_ADDR
-alpha_push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr *args;
- CORE_ADDR sp;
- int struct_return;
- CORE_ADDR struct_addr;
+alpha_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
- register i;
+ int i;
int accumulate_size = struct_return ? 8 : 0;
int arg_regs_size = ALPHA_NUM_ARG_REGS * 8;
- struct alpha_arg { char *contents; int len; int offset; };
+ struct alpha_arg
+ {
+ char *contents;
+ int len;
+ int offset;
+ };
struct alpha_arg *alpha_args =
- (struct alpha_arg*)alloca (nargs * sizeof (struct alpha_arg));
+ (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
register struct alpha_arg *m_arg;
char raw_buffer[sizeof (CORE_ADDR)];
int required_arg_regs;
for (i = 0, m_arg = alpha_args; i < nargs; i++, m_arg++)
{
- value_ptr arg = value_arg_coerce (args[i]);
+ struct value *arg = args[i];
+ struct type *arg_type = check_typedef (VALUE_TYPE (arg));
/* Cast argument to long if necessary as the compiler does it too. */
- if (TYPE_LENGTH (VALUE_TYPE (arg)) < TYPE_LENGTH (builtin_type_long))
- arg = value_cast (builtin_type_long, arg);
- m_arg->len = TYPE_LENGTH (VALUE_TYPE (arg));
+ switch (TYPE_CODE (arg_type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_ENUM:
+ if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long))
+ {
+ arg_type = builtin_type_long;
+ arg = value_cast (arg_type, arg);
+ }
+ break;
+ default:
+ break;
+ }
+ m_arg->len = TYPE_LENGTH (arg_type);
m_arg->offset = accumulate_size;
accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
- m_arg->contents = VALUE_CONTENTS(arg);
+ m_arg->contents = VALUE_CONTENTS (arg);
}
/* Determine required argument register loads, loading an argument register
/* Make room for the arguments on the stack. */
if (accumulate_size < arg_regs_size)
- accumulate_size = arg_regs_size;
+ accumulate_size = arg_regs_size;
sp -= accumulate_size;
/* Keep sp aligned to a multiple of 16 as the compiler does it too. */
sp &= ~15;
/* `Push' arguments on the stack. */
- for (i = nargs; m_arg--, --i >= 0; )
- write_memory(sp + m_arg->offset, m_arg->contents, m_arg->len);
+ for (i = nargs; m_arg--, --i >= 0;)
+ write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len);
if (struct_return)
{
store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr);
}
void
-alpha_push_dummy_frame()
+alpha_push_dummy_frame (void)
{
int ireg;
struct linked_proc_info *link;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
unsigned long mask;
- link = (struct linked_proc_info *) xmalloc(sizeof (struct linked_proc_info));
+ link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info));
link->next = linked_proc_desc_table;
linked_proc_desc_table = link;
-
+
proc_desc = &link->info;
/*
*
* Dummy frame layout:
* (high memory)
- * Saved PC
+ * Saved PC
* Saved F30
* ...
* Saved F0
- * Saved R29
- * ...
- * Saved R0
- * Saved R26 (RA)
- * Parameter build area
+ * Saved R29
+ * ...
+ * Saved R0
+ * Saved R26 (RA)
+ * Parameter build area
* (low memory)
*/
/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
-#define MASK(i,j) (((1L << ((j)+1)) - 1) ^ ((1L << (i)) - 1))
+#define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1))
#define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29))
#define GEN_REG_SAVE_COUNT 24
#define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30))
alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */
#define SPECIAL_REG_SAVE_COUNT 1
- PROC_REG_MASK(proc_desc) = GEN_REG_SAVE_MASK;
- PROC_FREG_MASK(proc_desc) = FLOAT_REG_SAVE_MASK;
+ PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK;
+ PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK;
/* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA,
but keep SP aligned to a multiple of 16. */
- PROC_REG_OFFSET(proc_desc) =
- - ((8 * (SPECIAL_REG_SAVE_COUNT
+ PROC_REG_OFFSET (proc_desc) =
+ -((8 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
+ FLOAT_REG_SAVE_COUNT)
- + 15) & ~15);
- PROC_FREG_OFFSET(proc_desc) =
- PROC_REG_OFFSET(proc_desc) + 8 * GEN_REG_SAVE_COUNT;
+ + 15) & ~15);
+ PROC_FREG_OFFSET (proc_desc) =
+ PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT;
/* Save general registers.
The return address register is the first saved register, all other
registers follow in ascending order.
The PC is saved immediately below the SP. */
- save_address = sp + PROC_REG_OFFSET(proc_desc);
+ save_address = sp + PROC_REG_OFFSET (proc_desc);
store_address (raw_buffer, 8, read_register (RA_REGNUM));
write_memory (save_address, raw_buffer, 8);
save_address += 8;
- mask = PROC_REG_MASK(proc_desc) & 0xffffffffL;
+ mask = PROC_REG_MASK (proc_desc) & 0xffffffffL;
for (ireg = 0; mask; ireg++, mask >>= 1)
if (mask & 1)
{
write_memory (sp - 8, raw_buffer, 8);
/* Save floating point registers. */
- save_address = sp + PROC_FREG_OFFSET(proc_desc);
- mask = PROC_FREG_MASK(proc_desc) & 0xffffffffL;
+ save_address = sp + PROC_FREG_OFFSET (proc_desc);
+ mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL;
for (ireg = 0; mask; ireg++, mask >>= 1)
if (mask & 1)
{
is set to the virtual frame (pseudo) register, it's value will always
be read as zero and will help us to catch any errors in the dummy frame
retrieval code. */
- PROC_DUMMY_FRAME(proc_desc) = sp;
- PROC_FRAME_REG(proc_desc) = FP_REGNUM;
- PROC_FRAME_OFFSET(proc_desc) = 0;
- sp += PROC_REG_OFFSET(proc_desc);
+ PROC_DUMMY_FRAME (proc_desc) = sp;
+ PROC_FRAME_REG (proc_desc) = FP_REGNUM;
+ PROC_FRAME_OFFSET (proc_desc) = 0;
+ sp += PROC_REG_OFFSET (proc_desc);
write_register (SP_REGNUM, sp);
- PROC_LOW_ADDR(proc_desc) = CALL_DUMMY_ADDRESS ();
- PROC_HIGH_ADDR(proc_desc) = PROC_LOW_ADDR(proc_desc) + 4;
+ PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS ();
+ PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4;
- SET_PROC_DESC_IS_DUMMY(proc_desc);
- PROC_PC_REG(proc_desc) = RA_REGNUM;
+ SET_PROC_DESC_IS_DUMMY (proc_desc);
+ PROC_PC_REG (proc_desc) = RA_REGNUM;
}
void
-alpha_pop_frame()
+alpha_pop_frame (void)
{
register int regnum;
- FRAME frame = get_current_frame ();
+ struct frame_info *frame = get_current_frame ();
CORE_ADDR new_sp = frame->frame;
- alpha_extra_func_info_t proc_desc = frame->proc_desc;
+ alpha_extra_func_info_t proc_desc = frame->extra_info->proc_desc;
+
+ /* we need proc_desc to know how to restore the registers;
+ if it is NULL, construct (a temporary) one */
+ if (proc_desc == NULL)
+ proc_desc = find_proc_desc (frame->pc, frame->next);
+
+ /* Question: should we copy this proc_desc and save it in
+ frame->proc_desc? If we do, who will free it?
+ For now, we don't save a copy... */
- write_register (PC_REGNUM, FRAME_SAVED_PC(frame));
+ write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
if (frame->saved_regs == NULL)
alpha_find_saved_regs (frame);
if (proc_desc)
{
- for (regnum = 32; --regnum >= 0; )
- if (PROC_REG_MASK(proc_desc) & (1 << regnum))
+ for (regnum = 32; --regnum >= 0;)
+ if (PROC_REG_MASK (proc_desc) & (1 << regnum))
write_register (regnum,
- read_memory_integer (frame->saved_regs->regs[regnum],
+ read_memory_integer (frame->saved_regs[regnum],
8));
- for (regnum = 32; --regnum >= 0; )
- if (PROC_FREG_MASK(proc_desc) & (1 << regnum))
+ for (regnum = 32; --regnum >= 0;)
+ if (PROC_FREG_MASK (proc_desc) & (1 << regnum))
write_register (regnum + FP0_REGNUM,
- read_memory_integer (frame->saved_regs->regs[regnum + FP0_REGNUM], 8));
+ read_memory_integer (frame->saved_regs[regnum + FP0_REGNUM], 8));
}
write_register (SP_REGNUM, new_sp);
flush_cached_frames ();
- /* We let init_extra_frame_info figure out the frame pointer */
- set_current_frame (create_new_frame (0, read_pc ()));
- if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
+ if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc)
+ || PROC_DESC_IS_DYN_SIGTRAMP (proc_desc)))
{
struct linked_proc_info *pi_ptr, *prev_ptr;
else
linked_proc_desc_table = pi_ptr->next;
- free (pi_ptr);
+ xfree (pi_ptr);
}
}
\f
LENIENT, then we must skip everything which is involved in setting
up the frame (it's OK to skip more, just so long as we don't skip
anything which might clobber the registers which are being saved.
- Currently we must not skip more on the alpha, but we might the lenient
- stuff some day. */
+ Currently we must not skip more on the alpha, but we might need the
+ lenient stuff some day. */
-CORE_ADDR
-alpha_skip_prologue (pc, lenient)
- CORE_ADDR pc;
- int lenient;
+static CORE_ADDR
+alpha_skip_prologue_internal (CORE_ADDR pc, int lenient)
{
- unsigned long inst;
- int offset;
- CORE_ADDR post_prologue_pc;
- char buf[4];
+ unsigned long inst;
+ int offset;
+ CORE_ADDR post_prologue_pc;
+ char buf[4];
#ifdef GDB_TARGET_HAS_SHARED_LIBS
- /* Silently return the unaltered pc upon memory errors.
- This could happen on OSF/1 if decode_line_1 tries to skip the
- prologue for quickstarted shared library functions when the
- shared library is not yet mapped in.
- Reading target memory is slow over serial lines, so we perform
- this check only if the target has shared libraries. */
- if (target_read_memory (pc, buf, 4))
- return pc;
+ /* Silently return the unaltered pc upon memory errors.
+ This could happen on OSF/1 if decode_line_1 tries to skip the
+ prologue for quickstarted shared library functions when the
+ shared library is not yet mapped in.
+ Reading target memory is slow over serial lines, so we perform
+ this check only if the target has shared libraries. */
+ if (target_read_memory (pc, buf, 4))
+ return pc;
#endif
- /* See if we can determine the end of the prologue via the symbol table.
- If so, then return either PC, or the PC after the prologue, whichever
- is greater. */
-
- post_prologue_pc = after_prologue (pc, NULL);
+ /* See if we can determine the end of the prologue via the symbol table.
+ If so, then return either PC, or the PC after the prologue, whichever
+ is greater. */
- if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ post_prologue_pc = after_prologue (pc, NULL);
- /* Can't determine prologue from the symbol table, need to examine
- instructions. */
+ if (post_prologue_pc != 0)
+ return max (pc, post_prologue_pc);
- /* 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)
- {
- int status;
-
- status = read_memory_nobpt (pc + offset, buf, 4);
- if (status)
- memory_error (status, pc + offset);
- inst = extract_unsigned_integer (buf, 4);
-
- /* The alpha has no delay slots. But let's keep the lenient stuff,
- we might need it for something else in the future. */
- if (lenient && 0)
- continue;
+ /* Can't determine prologue from the symbol table, need to examine
+ instructions. */
- if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
- continue;
- if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
- continue;
- if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- continue;
- else if ((inst & 0xfc1f0000) == 0xb41e0000
- && (inst & 0xffff0000) != 0xb7fe0000)
- continue; /* stq reg,n($sp) */
- /* reg != $zero */
- else if ((inst & 0xfc1f0000) == 0x9c1e0000
- && (inst & 0xffff0000) != 0x9ffe0000)
- continue; /* stt reg,n($sp) */
- /* reg != $zero */
- else if (inst == 0x47de040f) /* bis sp,sp,fp */
- continue;
- else
- break;
+ /* 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)
+ {
+ int status;
+
+ status = read_memory_nobpt (pc + offset, buf, 4);
+ if (status)
+ memory_error (status, pc + offset);
+ inst = extract_unsigned_integer (buf, 4);
+
+ /* The alpha has no delay slots. But let's keep the lenient stuff,
+ we might need it for something else in the future. */
+ if (lenient && 0)
+ continue;
+
+ if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ continue;
+ if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
+ continue;
+
+ if ((inst & 0xfc1f0000) == 0xb41e0000
+ && (inst & 0xffff0000) != 0xb7fe0000)
+ continue; /* stq reg,n($sp) */
+ /* reg != $zero */
+ if ((inst & 0xfc1f0000) == 0x9c1e0000
+ && (inst & 0xffff0000) != 0x9ffe0000)
+ continue; /* stt reg,n($sp) */
+ /* reg != $zero */
+ if (inst == 0x47de040f) /* bis sp,sp,fp */
+ continue;
+
+ break;
}
- return pc + offset;
+ return pc + offset;
+}
+
+CORE_ADDR
+alpha_skip_prologue (CORE_ADDR addr)
+{
+ return (alpha_skip_prologue_internal (addr, 0));
}
+#if 0
/* Is address PC in the prologue (loosely defined) for function at
STARTADDR? */
static int
-alpha_in_lenient_prologue (startaddr, pc)
- CORE_ADDR startaddr;
- CORE_ADDR pc;
+alpha_in_lenient_prologue (CORE_ADDR startaddr, CORE_ADDR pc)
{
- CORE_ADDR end_prologue = alpha_skip_prologue (startaddr, 1);
+ CORE_ADDR end_prologue = alpha_skip_prologue_internal (startaddr, 1);
return pc >= startaddr && pc < end_prologue;
}
+#endif
/* The alpha needs a conversion between register and memory format if
the register is a floating point register and
- memory format is float, as the register format must be double
+ memory format is float, as the register format must be double
or
- memory format is an integer with 4 bytes or less, as the representation
- of integers in floating point registers is different. */
+ memory format is an integer with 4 bytes or less, as the representation
+ of integers in floating point registers is different. */
void
-alpha_register_convert_to_virtual (regnum, valtype, raw_buffer, virtual_buffer)
- int regnum;
- struct type *valtype;
- char *raw_buffer;
- char *virtual_buffer;
+alpha_register_convert_to_virtual (int regnum, struct type *valtype,
+ char *raw_buffer, char *virtual_buffer)
{
if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
{
}
else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
{
- unsigned LONGEST l;
+ ULONGEST l;
l = extract_unsigned_integer (raw_buffer, REGISTER_RAW_SIZE (regnum));
l = ((l >> 32) & 0xc0000000) | ((l >> 29) & 0x3fffffff);
store_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype), l);
}
void
-alpha_register_convert_to_raw (valtype, regnum, virtual_buffer, raw_buffer)
- struct type *valtype;
- int regnum;
- char *virtual_buffer;
- char *raw_buffer;
+alpha_register_convert_to_raw (struct type *valtype, int regnum,
+ char *virtual_buffer, char *raw_buffer)
{
if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
{
}
else if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 4)
{
- unsigned LONGEST l;
+ ULONGEST l;
if (TYPE_UNSIGNED (valtype))
l = extract_unsigned_integer (virtual_buffer, TYPE_LENGTH (valtype));
else
/* Given a return value in `regbuf' with a type `valtype',
extract and copy its value into `valbuf'. */
+
void
-alpha_extract_return_value (valtype, regbuf, valbuf)
- struct type *valtype;
- char regbuf[REGISTER_BYTES];
- char *valbuf;
+alpha_extract_return_value (struct type *valtype,
+ char regbuf[REGISTER_BYTES], char *valbuf)
{
- int regnum;
-
- regnum = TYPE_CODE (valtype) == TYPE_CODE_FLT ? FP0_REGNUM : V0_REGNUM;
-
- memcpy (valbuf, regbuf + REGISTER_BYTE (regnum), TYPE_LENGTH (valtype));
+ if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
+ alpha_register_convert_to_virtual (FP0_REGNUM, valtype,
+ regbuf + REGISTER_BYTE (FP0_REGNUM),
+ valbuf);
+ else
+ memcpy (valbuf, regbuf + REGISTER_BYTE (V0_REGNUM), TYPE_LENGTH (valtype));
}
/* Given a return value in `regbuf' with a type `valtype',
write its value into the appropriate register. */
+
void
-alpha_store_return_value (valtype, valbuf)
- struct type *valtype;
- char *valbuf;
+alpha_store_return_value (struct type *valtype, char *valbuf)
{
- int regnum;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
-
- regnum = TYPE_CODE (valtype) == TYPE_CODE_FLT ? FP0_REGNUM : V0_REGNUM;
- memcpy(raw_buffer, valbuf, TYPE_LENGTH (valtype));
-
- write_register_bytes(REGISTER_BYTE (regnum), raw_buffer, TYPE_LENGTH (valtype));
-}
-
-/* Print the instruction at address MEMADDR in debugged memory,
- on STREAM. Returns length of the instruction, in bytes. */
+ int regnum = V0_REGNUM;
+ int length = TYPE_LENGTH (valtype);
-int
-print_insn (memaddr, stream)
- CORE_ADDR memaddr;
- GDB_FILE *stream;
-{
- disassemble_info info;
-
- GDB_INIT_DISASSEMBLE_INFO(info, stream);
+ if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
+ {
+ regnum = FP0_REGNUM;
+ length = REGISTER_RAW_SIZE (regnum);
+ alpha_register_convert_to_raw (valtype, regnum, valbuf, raw_buffer);
+ }
+ else
+ memcpy (raw_buffer, valbuf, length);
- return print_insn_alpha (memaddr, &info);
+ write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, length);
}
/* Just like reinit_frame_cache, but with the right arguments to be
callable as an sfunc. */
+
static void
-reinit_frame_cache_sfunc (args, from_tty, c)
- char *args;
- int from_tty;
- struct cmd_list_element *c;
+reinit_frame_cache_sfunc (char *args, int from_tty, struct cmd_list_element *c)
{
reinit_frame_cache ();
}
*/
CORE_ADDR
-alpha_call_dummy_address ()
+alpha_call_dummy_address (void)
{
CORE_ADDR entry;
struct minimal_symbol *sym;
if (entry != 0)
return entry;
- sym = lookup_minimal_symbol ("_Prelude", symfile_objfile);
+ sym = lookup_minimal_symbol ("_Prelude", NULL, symfile_objfile);
if (!sym || MSYMBOL_TYPE (sym) != mst_text)
return 0;
}
void
-_initialize_alpha_tdep ()
+alpha_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ CORE_ADDR bp_address = CALL_DUMMY_ADDRESS ();
+
+ if (bp_address == 0)
+ error ("no place to put call");
+ write_register (RA_REGNUM, bp_address);
+ write_register (T12_REGNUM, fun);
+}
+
+/* On the Alpha, the call dummy code is nevery copied to user space
+ (see alpha_fix_call_dummy() above). The contents of this do not
+ matter. */
+LONGEST alpha_call_dummy_words[] = { 0 };
+
+int
+alpha_use_struct_convention (int gcc_p, struct type *type)
+{
+ /* Structures are returned by ref in extra arg0. */
+ return 1;
+}
+
+void
+alpha_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ /* Store the address of the place in which to copy the structure the
+ subroutine will return. Handled by alpha_push_arguments. */
+}
+
+CORE_ADDR
+alpha_extract_struct_value_address (char *regbuf)
+{
+ return (extract_address (regbuf + REGISTER_BYTE (V0_REGNUM),
+ REGISTER_RAW_SIZE (V0_REGNUM)));
+}
+
+/* alpha_software_single_step() is called just before we want to resume
+ the inferior, if we want to single-step it but there is no hardware
+ or kernel single-step support (NetBSD on Alpha, for example). We find
+ the target of the coming instruction and breakpoint it.
+
+ single_step is also called just after the inferior stops. If we had
+ set up a simulated single-step, we undo our damage. */
+
+static CORE_ADDR
+alpha_next_pc (CORE_ADDR pc)
+{
+ unsigned int insn;
+ unsigned int op;
+ int offset;
+ LONGEST rav;
+
+ insn = read_memory_unsigned_integer (pc, sizeof (insn));
+
+ /* Opcode is top 6 bits. */
+ op = (insn >> 26) & 0x3f;
+
+ if (op == 0x1a)
+ {
+ /* Jump format: target PC is:
+ RB & ~3 */
+ return (read_register ((insn >> 16) & 0x1f) & ~3);
+ }
+
+ if ((op & 0x30) == 0x30)
+ {
+ /* Branch format: target PC is:
+ (new PC) + (4 * sext(displacement)) */
+ if (op == 0x30 || /* BR */
+ op == 0x34) /* BSR */
+ {
+ branch_taken:
+ offset = (insn & 0x001fffff);
+ if (offset & 0x00100000)
+ offset |= 0xffe00000;
+ offset *= 4;
+ return (pc + 4 + offset);
+ }
+
+ /* Need to determine if branch is taken; read RA. */
+ rav = (LONGEST) read_register ((insn >> 21) & 0x1f);
+ switch (op)
+ {
+ case 0x38: /* BLBC */
+ if ((rav & 1) == 0)
+ goto branch_taken;
+ break;
+ case 0x3c: /* BLBS */
+ if (rav & 1)
+ goto branch_taken;
+ break;
+ case 0x39: /* BEQ */
+ if (rav == 0)
+ goto branch_taken;
+ break;
+ case 0x3d: /* BNE */
+ if (rav != 0)
+ goto branch_taken;
+ break;
+ case 0x3a: /* BLT */
+ if (rav < 0)
+ goto branch_taken;
+ break;
+ case 0x3b: /* BLE */
+ if (rav <= 0)
+ goto branch_taken;
+ break;
+ case 0x3f: /* BGT */
+ if (rav > 0)
+ goto branch_taken;
+ break;
+ case 0x3e: /* BGE */
+ if (rav >= 0)
+ goto branch_taken;
+ break;
+ }
+ }
+
+ /* Not a branch or branch not taken; target PC is:
+ pc + 4 */
+ return (pc + 4);
+}
+
+void
+alpha_software_single_step (enum target_signal sig, int insert_breakpoints_p)
+{
+ static CORE_ADDR next_pc;
+ typedef char binsn_quantum[BREAKPOINT_MAX];
+ static binsn_quantum break_mem;
+ CORE_ADDR pc;
+
+ if (insert_breakpoints_p)
+ {
+ pc = read_pc ();
+ next_pc = alpha_next_pc (pc);
+
+ target_insert_breakpoint (next_pc, break_mem);
+ }
+ else
+ {
+ target_remove_breakpoint (next_pc, break_mem);
+ write_pc (next_pc);
+ }
+}
+
+void
+_initialize_alpha_tdep (void)
{
struct cmd_list_element *c;
+ tm_print_insn = print_insn_alpha;
+
/* Let the user set the fence post for heuristic_proc_start. */
/* We really would like to have both "0" and "unlimited" work, but
&setlist);
/* We need to throw away the frame cache when we set this, since it
might change our ability to get backtraces. */
- c->function.sfunc = reinit_frame_cache_sfunc;
+ set_cmd_sfunc (c, reinit_frame_cache_sfunc);
add_show_from_set (c, &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff