/* Target-dependent mdebug code for the ALPHA architecture.
- Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
- 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1993-2021 Free Software Foundation, Inc.
This file is part of GDB.
#include "symtab.h"
#include "gdbcore.h"
#include "block.h"
-#include "gdb_assert.h"
-#include "gdb_string.h"
#include "trad-frame.h"
#include "alpha-tdep.h"
#include "mdebugread.h"
+#include "gdbarch.h"
/* FIXME: Some of this code should perhaps be merged with mips. */
/* *INDENT-OFF* */
/* Layout of a stack frame on the alpha:
- | |
+ | |
pdr members: | 7th ... nth arg, |
- | `pushed' by caller. |
- | |
+ | `pushed' by caller. |
+ | |
----------------|-------------------------------|<-- old_sp == vfp
^ ^ ^ ^ | |
| | | | | |
| | called procedure. |
v | |
-------------|-------------------------------|<-- sp
- | |
+ | |
*/
/* *INDENT-ON* */
static struct mdebug_extra_func_info *
find_proc_desc (CORE_ADDR pc)
{
- struct block *b = block_for_pc (pc);
+ const struct block *b = block_for_pc (pc);
struct mdebug_extra_func_info *proc_desc = NULL;
struct symbol *sym = NULL;
- char *sh_name = NULL;
+ const char *sh_name = NULL;
if (b)
{
symbol reading. */
sym = NULL;
else
- sym = lookup_symbol (MDEBUG_EFI_SYMBOL_NAME, b, LABEL_DOMAIN, 0);
+ sym = lookup_symbol (MDEBUG_EFI_SYMBOL_NAME, b, LABEL_DOMAIN,
+ 0).symbol;
}
if (sym)
{
- proc_desc = (struct mdebug_extra_func_info *) SYMBOL_VALUE (sym);
+ proc_desc = (struct mdebug_extra_func_info *) SYMBOL_VALUE_BYTES (sym);
/* Correct incorrect setjmp procedure descriptor from the library
- to make backtrace through setjmp work. */
+ to make backtrace through setjmp work. */
if (proc_desc->pdr.pcreg == 0
&& strcmp (sh_name, "setjmp") == 0)
{
return proc_desc;
}
+/* Return a non-zero result if the function is frameless; zero otherwise. */
+
+static int
+alpha_mdebug_frameless (struct mdebug_extra_func_info *proc_desc)
+{
+ return (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
+ && PROC_FRAME_OFFSET (proc_desc) == 0);
+}
+
/* This returns the PC of the first inst after the prologue. If we can't
find the prologue, then return 0. */
static CORE_ADDR
-alpha_mdebug_after_prologue (CORE_ADDR pc, struct mdebug_extra_func_info *proc_desc)
+alpha_mdebug_after_prologue (CORE_ADDR pc,
+ struct mdebug_extra_func_info *proc_desc)
{
if (proc_desc)
{
/* If function is frameless, then we need to do it the hard way. I
- strongly suspect that frameless always means prologueless... */
- if (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0)
+ strongly suspect that frameless always means prologueless... */
+ if (alpha_mdebug_frameless (proc_desc))
return 0;
}
if we are definitively *not* in a function prologue. */
static int
-alpha_mdebug_in_prologue (CORE_ADDR pc, struct mdebug_extra_func_info *proc_desc)
+alpha_mdebug_in_prologue (CORE_ADDR pc,
+ struct mdebug_extra_func_info *proc_desc)
{
CORE_ADDR after_prologue_pc = alpha_mdebug_after_prologue (pc, proc_desc);
return (after_prologue_pc == 0 || pc < after_prologue_pc);
{
struct mdebug_extra_func_info *proc_desc;
CORE_ADDR vfp;
- struct trad_frame_saved_reg *saved_regs;
+ trad_frame_saved_reg *saved_regs;
};
/* Extract all of the information about the frame from PROC_DESC
int ireg, returnreg;
if (*this_prologue_cache)
- return *this_prologue_cache;
+ return (struct alpha_mdebug_unwind_cache *) *this_prologue_cache;
info = FRAME_OBSTACK_ZALLOC (struct alpha_mdebug_unwind_cache);
*this_prologue_cache = info;
register number. */
if (mask & (1 << returnreg))
{
- /* Clear bit for RA so we don't save it again later. */
+ /* Clear bit for RA so we don't save it again later. */
mask &= ~(1 << returnreg);
- info->saved_regs[returnreg].addr = reg_position;
+ info->saved_regs[returnreg].set_addr (reg_position);
reg_position += 8;
}
for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
- info->saved_regs[ireg].addr = reg_position;
+ info->saved_regs[ireg].set_addr (reg_position);
reg_position += 8;
}
for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
- info->saved_regs[ALPHA_FP0_REGNUM + ireg].addr = reg_position;
+ info->saved_regs[ALPHA_FP0_REGNUM + ireg].set_addr (reg_position);
reg_position += 8;
}
/* The stack pointer of the previous frame is computed by popping
the current stack frame. */
- if (!trad_frame_addr_p (info->saved_regs, ALPHA_SP_REGNUM))
- trad_frame_set_value (info->saved_regs, ALPHA_SP_REGNUM, vfp);
+ if (!info->saved_regs[ALPHA_SP_REGNUM].is_addr ())
+ info->saved_regs[ALPHA_SP_REGNUM].set_value (vfp);
return info;
}
return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
+/* Return a non-zero result if the size of the stack frame exceeds the
+ maximum debuggable frame size (512 Kbytes); zero otherwise. */
+
+static int
+alpha_mdebug_max_frame_size_exceeded (struct mdebug_extra_func_info *proc_desc)
+{
+ /* If frame offset is null, we can be in two cases: either the
+ function is frameless (the stack frame is null) or its
+ frame exceeds the maximum debuggable frame size (512 Kbytes). */
+
+ return (PROC_FRAME_OFFSET (proc_desc) == 0
+ && !alpha_mdebug_frameless (proc_desc));
+}
+
static int
alpha_mdebug_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame,
- void **this_cache)
+ struct frame_info *this_frame,
+ void **this_cache)
{
CORE_ADDR pc = get_frame_address_in_block (this_frame);
struct mdebug_extra_func_info *proc_desc;
if (alpha_mdebug_in_prologue (pc, proc_desc))
return 0;
+ /* If the maximum debuggable frame size has been exceeded, the
+ proc desc is bogus. Fall back on the heuristic unwinder. */
+ if (alpha_mdebug_max_frame_size_exceeded (proc_desc))
+ return 0;
+
return 1;
}
static const struct frame_unwind alpha_mdebug_frame_unwind = {
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
alpha_mdebug_frame_this_id,
alpha_mdebug_frame_prev_register,
NULL,
if (proc_desc == NULL)
return NULL;
+ /* If the maximum debuggable frame size has been exceeded, the
+ proc desc is bogus. Fall back on the heuristic unwinder. */
+ if (alpha_mdebug_max_frame_size_exceeded (proc_desc))
+ return 0;
+
return &alpha_mdebug_frame_base;
}
void
alpha_mdebug_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
frame_unwind_append_unwinder (gdbarch, &alpha_mdebug_frame_unwind);
frame_base_append_sniffer (gdbarch, alpha_mdebug_frame_base_sniffer);
}
projects / deliverable / binutils-gdb.git / blobdiff