/* Target-machine dependent code for Nios II, for GDB.
- Copyright (C) 2012-2017 Free Software Foundation, Inc.
+ Copyright (C) 2012-2022 Free Software Foundation, Inc.
Contributed by Peter Brookes (pbrookes@altera.com)
and Andrew Draper (adraper@altera.com).
Contributed by Mentor Graphics, Inc.
#include "frame-unwind.h"
#include "frame-base.h"
#include "trad-frame.h"
-#include "dwarf2-frame.h"
+#include "dwarf2/frame.h"
#include "symtab.h"
#include "inferior.h"
#include "gdbtypes.h"
#include "value.h"
#include "symfile.h"
#include "arch-utils.h"
-#include "floatformat.h"
#include "infcall.h"
#include "regset.h"
#include "target-descriptions.h"
/* Control debugging information emitted in this file. */
-static int nios2_debug = 0;
+static bool nios2_debug = false;
/* The following structures are used in the cache for prologue
analysis; see the reg_value and reg_saved tables in
struct nios2_unwind_cache, respectively. */
-/* struct reg_value is used to record that a register has the same value
- as reg at the given offset from the start of a function. */
+/* struct reg_value is used to record that a register has reg's initial
+ value at the start of a function plus the given constant offset.
+ If reg == 0, then the value is just the offset.
+ If reg < 0, then the value is unknown. */
struct reg_value
{
int reg;
- unsigned int offset;
+ int offset;
};
/* struct reg_saved is used to record that a register value has been saved at
/* Return values of up to 8 bytes are returned in $r2 $r3. */
if (len <= register_size (gdbarch, NIOS2_R2_REGNUM))
- regcache_cooked_read (regcache, NIOS2_R2_REGNUM, valbuf);
+ regcache->cooked_read (NIOS2_R2_REGNUM, valbuf);
else
{
gdb_assert (len <= (register_size (gdbarch, NIOS2_R2_REGNUM)
+ register_size (gdbarch, NIOS2_R3_REGNUM)));
- regcache_cooked_read (regcache, NIOS2_R2_REGNUM, valbuf);
- regcache_cooked_read (regcache, NIOS2_R3_REGNUM, valbuf + 4);
+ regcache->cooked_read (NIOS2_R2_REGNUM, valbuf);
+ regcache->cooked_read (NIOS2_R3_REGNUM, valbuf + 4);
}
}
/* Return values of up to 8 bytes are returned in $r2 $r3. */
if (len <= register_size (gdbarch, NIOS2_R2_REGNUM))
- regcache_cooked_write (regcache, NIOS2_R2_REGNUM, valbuf);
+ regcache->cooked_write (NIOS2_R2_REGNUM, valbuf);
else
{
gdb_assert (len <= (register_size (gdbarch, NIOS2_R2_REGNUM)
+ register_size (gdbarch, NIOS2_R3_REGNUM)));
- regcache_cooked_write (regcache, NIOS2_R2_REGNUM, valbuf);
- regcache_cooked_write (regcache, NIOS2_R3_REGNUM, valbuf + 4);
+ regcache->cooked_write (NIOS2_R2_REGNUM, valbuf);
+ regcache->cooked_write (NIOS2_R3_REGNUM, valbuf + 4);
}
}
int i;
for (i = 0; i < NIOS2_NUM_REGS; i++)
- {
- /* All registers start off holding their previous values. */
- cache->reg_value[i].reg = i;
- cache->reg_value[i].offset = 0;
-
- /* All registers start off not saved. */
- cache->reg_saved[i].basereg = -1;
- cache->reg_saved[i].addr = 0;
- }
+ {
+ /* All registers start off holding their previous values. */
+ cache->reg_value[i].reg = i;
+ cache->reg_value[i].offset = 0;
+
+ /* All registers start off not saved. */
+ cache->reg_saved[i].basereg = -1;
+ cache->reg_saved[i].addr = 0;
+ }
}
/* Initialize the unwind cache. */
mov ra, r8
2) A stack adjustment and save of R4-R7 for varargs functions.
- For R2 CDX this is typically handled with a STWM, otherwise
+ For R2 CDX this is typically handled with a STWM, otherwise
this is typically merged with item 3.
3) A stack adjustment and save of the callee-saved registers.
- For R2 CDX these are typically handled with a PUSH.N or STWM,
+ For R2 CDX these are typically handled with a PUSH.N or STWM,
otherwise as an explicit SP decrement and individual register
saves.
- There may also be a stack switch here in an exception handler
+ There may also be a stack switch here in an exception handler
in place of a stack adjustment. It looks like:
movhi rx, %hiadj(newstack)
addhi rx, rx, %lo(newstack)
4) A frame pointer save, which can be either a MOV or ADDI.
5) A further stack pointer adjustment. This is normally included
- adjustment in step 3 unless the total adjustment is too large
+ adjustment in step 3 unless the total adjustment is too large
to be done in one step.
7) A stack overflow check, which can take either of these forms:
struct reg_value *value = cache->reg_value;
struct reg_value temp_value[NIOS2_NUM_REGS];
- int i;
-
/* Save the starting PC so we can correct the pc after running
through the prolog, using symbol info. */
CORE_ADDR pc = start_pc;
int innermost = (this_frame ? (frame_relative_level (this_frame) == 0) : 1);
if (nios2_debug)
- fprintf_unfiltered (gdb_stdlog,
- "{ nios2_analyze_prologue start=%s, current=%s ",
- paddress (gdbarch, start_pc),
- paddress (gdbarch, current_pc));
+ gdb_printf (gdb_stdlog,
+ "{ nios2_analyze_prologue start=%s, current=%s ",
+ paddress (gdbarch, start_pc),
+ paddress (gdbarch, current_pc));
/* Set up the default values of the registers. */
nios2_setup_default (cache);
enum branch_condition cond;
if (pc == current_pc)
- {
- /* When we reach the current PC we must save the current
- register state (for the backtrace) but keep analysing
- because there might be more to find out (eg. is this an
- exception handler). */
- memcpy (temp_value, value, sizeof (temp_value));
- value = temp_value;
- if (nios2_debug)
- fprintf_unfiltered (gdb_stdlog, "*");
- }
+ {
+ /* When we reach the current PC we must save the current
+ register state (for the backtrace) but keep analysing
+ because there might be more to find out (eg. is this an
+ exception handler). */
+ memcpy (temp_value, value, sizeof (temp_value));
+ value = temp_value;
+ if (nios2_debug)
+ gdb_printf (gdb_stdlog, "*");
+ }
op = nios2_fetch_insn (gdbarch, pc, &insn);
if (nios2_debug)
{
if (op->size == 2)
- fprintf_unfiltered (gdb_stdlog, "[%04X]", insn & 0xffff);
+ gdb_printf (gdb_stdlog, "[%04X]", insn & 0xffff);
else
- fprintf_unfiltered (gdb_stdlog, "[%08X]", insn);
+ gdb_printf (gdb_stdlog, "[%08X]", insn);
}
/* The following instructions can appear in the prologue. */
/* If any registers were saved on the stack before then
we can't backtrace into them now. */
- for (i = 0 ; i < NIOS2_NUM_REGS ; i++)
+ for (int i = 0 ; i < NIOS2_NUM_REGS ; i++)
{
if (cache->reg_saved[i].basereg == NIOS2_SP_REGNUM)
cache->reg_saved[i].basereg = -1;
/* ORHI rb, ra, uimm (also used for MOVHI) */
if (rb != 0)
{
- value[rb].reg = (value[ra].reg == 0) ? 0 : -1;
+ value[rb].reg = (value[ra].reg == 0) ? 0 : -1;
value[rb].offset = value[ra].offset | (uimm << 16);
}
}
else if (nios2_match_stw (insn, op, mach, &ra, &rb, &imm))
- {
+ {
/* STW rb, imm(ra) */
/* Are we storing the original value of a register to the stack?
else
/* Non-stack memory writes cannot appear in the prologue. */
break;
- }
+ }
else if (nios2_match_stwm (insn, op, mach,
®list, &ra, &imm, &wb, &id))
/* PUSH.N {reglist}, adjust
or
STWM {reglist}, --(SP)[, writeback] */
- int i;
int off = 0;
if (ra != NIOS2_SP_REGNUM || id != 0)
part of the prologue. */
break;
- for (i = 31; i >= 0; i--)
+ for (int i = 31; i >= 0; i--)
if (reglist & (1 << i))
{
int orig = value[i].reg;
value[rc].reg = NIOS2_STATUS_REGNUM + ra;
value[rc].offset = 0;
}
- }
+ }
else if (nios2_match_calli (insn, op, mach, &uimm))
{
if ra has been stored into r8 beforehand and if it's
before the stack adjust.
Note mcount corrupts r2-r3, r9-r15 & ra. */
- for (i = 2 ; i <= 3 ; i++)
+ for (int i = 2 ; i <= 3 ; i++)
value[i].reg = -1;
- for (i = 9 ; i <= 15 ; i++)
+ for (int i = 9 ; i <= 15 ; i++)
value[i].reg = -1;
value[NIOS2_RA_REGNUM].reg = -1;
cache->return_regnum = NIOS2_EA_REGNUM;
if (nios2_debug)
- fprintf_unfiltered (gdb_stdlog, "\n-> retreg=%d, ", cache->return_regnum);
+ gdb_printf (gdb_stdlog, "\n-> retreg=%d, ", cache->return_regnum);
if (cache->reg_value[NIOS2_FP_REGNUM].reg == NIOS2_SP_REGNUM)
/* If the FP now holds an offset from the CFA then this is a
/* Somehow the stack pointer has been corrupted.
We can't return. */
if (nios2_debug)
- fprintf_unfiltered (gdb_stdlog, "<can't reach cfa> }\n");
+ gdb_printf (gdb_stdlog, "<can't reach cfa> }\n");
return 0;
}
if (ra == current_pc)
{
if (nios2_debug)
- fprintf_unfiltered
+ gdb_printf
(gdb_stdlog,
"<noreturn ADJUST %s, r31@r%d+?>, r%d@r%d+?> }\n",
paddress (gdbarch, cache->reg_value[base_reg].offset),
/* Adjust all the saved registers such that they contain addresses
instead of offsets. */
- for (i = 0; i < NIOS2_NUM_REGS; i++)
+ for (int i = 0; i < NIOS2_NUM_REGS; i++)
if (cache->reg_saved[i].basereg == NIOS2_SP_REGNUM)
{
cache->reg_saved[i].basereg = NIOS2_Z_REGNUM;
cache->reg_saved[i].addr += frame_high;
}
- for (i = 0; i < NIOS2_NUM_REGS; i++)
+ for (int i = 0; i < NIOS2_NUM_REGS; i++)
if (cache->reg_saved[i].basereg == NIOS2_GP_REGNUM)
{
CORE_ADDR gp = get_frame_register_unsigned (this_frame,
}
if (nios2_debug)
- fprintf_unfiltered (gdb_stdlog, "cfa=%s }\n",
- paddress (gdbarch, cache->cfa));
+ gdb_printf (gdb_stdlog, "cfa=%s }\n",
+ paddress (gdbarch, cache->cfa));
return prologue_end;
}
if (find_pc_partial_function (start_pc, NULL, &func_addr, NULL))
{
CORE_ADDR post_prologue_pc
- = skip_prologue_using_sal (gdbarch, func_addr);
+ = skip_prologue_using_sal (gdbarch, func_addr);
if (post_prologue_pc != 0)
- return std::max (start_pc, post_prologue_pc);
+ return std::max (start_pc, post_prologue_pc);
}
/* Prologue analysis does the rest.... */
}
}
-/* Implement the print_insn gdbarch method. */
-
-static int
-nios2_print_insn (bfd_vma memaddr, disassemble_info *info)
-{
- if (info->endian == BFD_ENDIAN_BIG)
- return print_insn_big_nios2 (memaddr, info);
- else
- return print_insn_little_nios2 (memaddr, info);
-}
-
-
/* Implement the frame_align gdbarch method. */
static CORE_ADDR
return RETURN_VALUE_REGISTER_CONVENTION;
}
-/* Implement the dummy_id gdbarch method. */
-
-static struct frame_id
-nios2_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
- return frame_id_build
- (get_frame_register_unsigned (this_frame, NIOS2_SP_REGNUM),
- get_frame_pc (this_frame));
-}
-
/* Implement the push_dummy_call gdbarch method. */
static CORE_ADDR
nios2_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
- struct regcache *regcache, CORE_ADDR bp_addr,
- int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
int argreg;
- int float_argreg;
int argnum;
- int len = 0;
+ int arg_space = 0;
int stack_offset = 0;
- CORE_ADDR func_addr = find_function_addr (function, NULL);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* Set the return address register to point to the entry point of
/* Now make space on the stack for the args. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (value_type (args[argnum])), 4);
- sp -= len;
+ arg_space += align_up (TYPE_LENGTH (value_type (args[argnum])), 4);
+ sp -= arg_space;
/* Initialize the register pointer. */
argreg = NIOS2_FIRST_ARGREG;
/* The struct_return pointer occupies the first parameter-passing
register. */
- if (struct_return)
+ if (return_method == return_method_struct)
regcache_cooked_write_unsigned (regcache, argreg++, struct_addr);
/* Now load as many as possible of the first arguments into
struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
- val = value_contents (arg);
+ val = value_contents (arg).data ();
/* Copy the argument to general registers or the stack in
- register-sized pieces. Large arguments are split between
- registers and stack. */
+ register-sized pieces. Large arguments are split between
+ registers and stack. */
while (len > 0)
- {
+ {
int partial_len = (len < 4 ? len : 4);
if (argreg <= NIOS2_LAST_ARGREG)
return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr);
}
-/* Implement the unwind_sp gdbarch method. */
-
-static CORE_ADDR
-nios2_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
- return frame_unwind_register_unsigned (this_frame, NIOS2_SP_REGNUM);
-}
-
/* Use prologue analysis to fill in the register cache
*THIS_PROLOGUE_CACHE for THIS_FRAME. This function initializes
*THIS_PROLOGUE_CACHE first. */
static const struct frame_unwind nios2_frame_unwind =
{
+ "nios2 prologue",
NORMAL_FRAME,
default_frame_unwind_stop_reason,
nios2_frame_this_id,
/* The return address is in the link register. */
trad_frame_set_reg_realreg (this_trad_cache,
- gdbarch_pc_regnum (gdbarch),
- NIOS2_RA_REGNUM);
+ gdbarch_pc_regnum (gdbarch),
+ NIOS2_RA_REGNUM);
/* Frame ID, since it's a frameless / stackless function, no stack
space is allocated and SP on entry is the current SP. */
static void
nios2_stub_frame_this_id (struct frame_info *this_frame, void **this_cache,
- struct frame_id *this_id)
+ struct frame_id *this_id)
{
struct trad_frame_cache *this_trad_cache
= nios2_stub_frame_cache (this_frame, this_cache);
static struct value *
nios2_stub_frame_prev_register (struct frame_info *this_frame,
- void **this_cache, int regnum)
+ void **this_cache, int regnum)
{
struct trad_frame_cache *this_trad_cache
= nios2_stub_frame_cache (this_frame, this_cache);
static const struct frame_unwind nios2_stub_frame_unwind =
{
+ "nios2 stub",
NORMAL_FRAME,
default_frame_unwind_stop_reason,
nios2_stub_frame_this_id,
static CORE_ADDR
nios2_get_next_pc (struct regcache *regcache, CORE_ADDR pc)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ struct gdbarch *gdbarch = regcache->arch ();
+ nios2_gdbarch_tdep *tdep = gdbarch_tdep<nios2_gdbarch_tdep> (gdbarch);
unsigned long mach = gdbarch_bfd_arch_info (gdbarch)->mach;
unsigned int insn;
const struct nios2_opcode *op = nios2_fetch_insn (gdbarch, pc, &insn);
}
}
- else if (nios2_match_jmpi (insn, op, mach, &uimm)
- || nios2_match_calli (insn, op, mach, &uimm))
+ else if (nios2_match_jmpi (insn, op, mach, &uimm))
pc = (pc & 0xf0000000) | uimm;
+ else if (nios2_match_calli (insn, op, mach, &uimm))
+ {
+ CORE_ADDR callto = (pc & 0xf0000000) | uimm;
+ if (tdep->is_kernel_helper != NULL
+ && tdep->is_kernel_helper (callto))
+ /* Step over call to kernel helper, which we cannot debug
+ from user space. */
+ pc += op->size;
+ else
+ pc = callto;
+ }
- else if (nios2_match_jmpr (insn, op, mach, &ra)
- || nios2_match_callr (insn, op, mach, &ra))
+ else if (nios2_match_jmpr (insn, op, mach, &ra))
pc = regcache_raw_get_unsigned (regcache, ra);
+ else if (nios2_match_callr (insn, op, mach, &ra))
+ {
+ CORE_ADDR callto = regcache_raw_get_unsigned (regcache, ra);
+ if (tdep->is_kernel_helper != NULL
+ && tdep->is_kernel_helper (callto))
+ /* Step over call to kernel helper. */
+ pc += op->size;
+ else
+ pc = callto;
+ }
else if (nios2_match_ldwm (insn, op, mach, &uimm, &ra, &imm, &wb, &id, &ret)
&& ret)
static std::vector<CORE_ADDR>
nios2_software_single_step (struct regcache *regcache)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR next_pc = nios2_get_next_pc (regcache, regcache_read_pc (regcache));
return {next_pc};
nios2_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ nios2_gdbarch_tdep *tdep = gdbarch_tdep<nios2_gdbarch_tdep> (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR jb_addr = get_frame_register_unsigned (frame, NIOS2_R4_REGNUM);
gdb_byte buf[4];
return 1;
}
+/* Implement the type_align gdbarch function. */
+
+static ULONGEST
+nios2_type_align (struct gdbarch *gdbarch, struct type *type)
+{
+ switch (type->code ())
+ {
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_FUNC:
+ case TYPE_CODE_FLAGS:
+ case TYPE_CODE_INT:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_REF:
+ case TYPE_CODE_RVALUE_REF:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_DECFLOAT:
+ case TYPE_CODE_METHODPTR:
+ case TYPE_CODE_MEMBERPTR:
+ type = check_typedef (type);
+ return std::min<ULONGEST> (4, TYPE_LENGTH (type));
+ default:
+ return 0;
+ }
+}
+
+/* Implement the gcc_target_options gdbarch method. */
+static std::string
+nios2_gcc_target_options (struct gdbarch *gdbarch)
+{
+ /* GCC doesn't know "-m32". */
+ return {};
+}
+
/* Initialize the Nios II gdbarch. */
static struct gdbarch *
nios2_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
- struct gdbarch_tdep *tdep;
int i;
- struct tdesc_arch_data *tdesc_data = NULL;
+ tdesc_arch_data_up tdesc_data;
const struct target_desc *tdesc = info.target_desc;
if (!tdesc_has_registers (tdesc))
valid_p = 1;
for (i = 0; i < NIOS2_NUM_REGS; i++)
- valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
+ valid_p &= tdesc_numbered_register (feature, tdesc_data.get (), i,
nios2_reg_names[i]);
if (!valid_p)
- {
- tdesc_data_cleanup (tdesc_data);
- return NULL;
- }
+ return NULL;
}
/* Find a candidate among the list of pre-declared architectures. */
/* None found, create a new architecture from the information
provided. */
- tdep = XCNEW (struct gdbarch_tdep);
+ nios2_gdbarch_tdep *tdep = new nios2_gdbarch_tdep;
gdbarch = gdbarch_alloc (&info, tdep);
/* longjmp support not enabled by default. */
set_gdbarch_float_bit (gdbarch, 32);
set_gdbarch_double_bit (gdbarch, 64);
+ set_gdbarch_type_align (gdbarch, nios2_type_align);
+
set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
set_gdbarch_double_format (gdbarch, floatformats_ieee_double);
set_gdbarch_breakpoint_kind_from_pc (gdbarch, nios2_breakpoint_kind_from_pc);
set_gdbarch_sw_breakpoint_from_kind (gdbarch, nios2_sw_breakpoint_from_kind);
- set_gdbarch_dummy_id (gdbarch, nios2_dummy_id);
set_gdbarch_unwind_pc (gdbarch, nios2_unwind_pc);
- set_gdbarch_unwind_sp (gdbarch, nios2_unwind_sp);
/* The dwarf2 unwinder will normally produce the best results if
the debug information is available, so register it first. */
/* Single stepping. */
set_gdbarch_software_single_step (gdbarch, nios2_software_single_step);
+ /* Target options for compile. */
+ set_gdbarch_gcc_target_options (gdbarch, nios2_gcc_target_options);
+
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
frame_base_set_default (gdbarch, &nios2_frame_base);
- set_gdbarch_print_insn (gdbarch, nios2_print_insn);
-
/* Enable inferior call support. */
set_gdbarch_push_dummy_call (gdbarch, nios2_push_dummy_call);
- if (tdesc_data)
- tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+ if (tdesc_data != nullptr)
+ tdesc_use_registers (gdbarch, tdesc, std::move (tdesc_data));
return gdbarch;
}
-extern initialize_file_ftype _initialize_nios2_tdep; /* -Wmissing-prototypes */
-
+void _initialize_nios2_tdep ();
void
-_initialize_nios2_tdep (void)
+_initialize_nios2_tdep ()
{
gdbarch_register (bfd_arch_nios2, nios2_gdbarch_init, NULL);
initialize_tdesc_nios2 ();
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