#include "elf/m68hc11.h"
#include "elf-bfd.h"
+/* Macros for setting and testing a bit in a minimal symbol.
+ For 68HC11/68HC12 we have two flags that tell which return
+ type the function is using. This is used for prologue and frame
+ analysis to compute correct stack frame layout.
+
+ The MSB of the minimal symbol's "info" field is used for this purpose.
+ This field is already being used to store the symbol size, so the
+ assumption is that the symbol size cannot exceed 2^30.
+
+ MSYMBOL_SET_RTC Actually sets the "RTC" bit.
+ MSYMBOL_SET_RTI Actually sets the "RTI" bit.
+ MSYMBOL_IS_RTC Tests the "RTC" bit in a minimal symbol.
+ MSYMBOL_IS_RTI Tests the "RTC" bit in a minimal symbol.
+ MSYMBOL_SIZE Returns the size of the minimal symbol,
+ i.e. the "info" field with the "special" bit
+ masked out. */
+
+#define MSYMBOL_SET_RTC(msym) \
+ MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
+ | 0x80000000)
+
+#define MSYMBOL_SET_RTI(msym) \
+ MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
+ | 0x40000000)
+
+#define MSYMBOL_IS_RTC(msym) \
+ (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
+
+#define MSYMBOL_IS_RTI(msym) \
+ (((long) MSYMBOL_INFO (msym) & 0x40000000) != 0)
+
+#define MSYMBOL_SIZE(msym) \
+ ((long) MSYMBOL_INFO (msym) & 0x3fffffff)
+
+enum insn_return_kind {
+ RETURN_RTS,
+ RETURN_RTC,
+ RETURN_RTI
+};
+
+
/* Register numbers of various important registers.
Note that some of these values are "real" register numbers,
and correspond to the general registers of the machine,
#define HARD_A_REGNUM 5
#define HARD_B_REGNUM 6
#define HARD_CCR_REGNUM 7
-#define M68HC11_LAST_HARD_REG (HARD_CCR_REGNUM)
+
+/* 68HC12 page number register.
+ Note: to keep a compatibility with gcc register naming, we must
+ not have to rename FP and other soft registers. The page register
+ is a real hard register and must therefore be counted by NUM_REGS.
+ For this it has the same number as Z register (which is not used). */
+#define HARD_PAGE_REGNUM 8
+#define M68HC11_LAST_HARD_REG (HARD_PAGE_REGNUM)
/* Z is replaced by X or Y by gcc during machine reorg.
??? There is no way to get it and even know whether
#define M68HC11_REG_SIZE (2)
+#define M68HC12_NUM_REGS (9)
+#define M68HC12_NUM_PSEUDO_REGS ((M68HC11_MAX_SOFT_REGS+5)+1-1)
+#define M68HC12_HARD_PC_REGNUM (SOFT_D32_REGNUM+1)
+
struct insn_sequence;
struct gdbarch_tdep
{
/* Description of instructions in the prologue. */
struct insn_sequence *prologue;
+ /* True if the page memory bank register is available
+ and must be used. */
+ int use_page_register;
+
/* ELF flags for ABI. */
int elf_flags;
};
#define M6811_TDEP gdbarch_tdep (current_gdbarch)
#define STACK_CORRECTION (M6811_TDEP->stack_correction)
+#define USE_PAGE_REGISTER (M6811_TDEP->use_page_register)
struct frame_extra_info
{
- int frame_reg;
CORE_ADDR return_pc;
- CORE_ADDR dummy;
int frameless;
int size;
+ enum insn_return_kind return_kind;
};
/* Table of registers for 68HC11. This includes the hard registers
m68hc11_register_names[] =
{
"x", "d", "y", "sp", "pc", "a", "b",
- "ccr", "z", "frame","tmp", "zs", "xy", 0,
+ "ccr", "page", "frame","tmp", "zs", "xy", 0,
"d1", "d2", "d3", "d4", "d5", "d6", "d7",
"d8", "d9", "d10", "d11", "d12", "d13", "d14",
"d15", "d16", "d17", "d18", "d19", "d20", "d21",
struct regcache *regcache,
int regno, void *buf)
{
+ /* The PC is a pseudo reg only for 68HC12 with the memory bank
+ addressing mode. */
+ if (regno == M68HC12_HARD_PC_REGNUM)
+ {
+ const int regsize = TYPE_LENGTH (builtin_type_uint32);
+ CORE_ADDR pc = read_register (HARD_PC_REGNUM);
+ int page = read_register (HARD_PAGE_REGNUM);
+
+ if (pc >= 0x8000 && pc < 0xc000)
+ {
+ pc -= 0x8000;
+ pc += (page << 14);
+ pc += 0x1000000;
+ }
+ store_unsigned_integer (buf, regsize, pc);
+ return;
+ }
+
m68hc11_initialize_register_info ();
/* Fetch a soft register: translate into a memory read. */
struct regcache *regcache,
int regno, const void *buf)
{
+ /* The PC is a pseudo reg only for 68HC12 with the memory bank
+ addressing mode. */
+ if (regno == M68HC12_HARD_PC_REGNUM)
+ {
+ const int regsize = TYPE_LENGTH (builtin_type_uint32);
+ char *tmp = alloca (regsize);
+ CORE_ADDR pc;
+
+ memcpy (tmp, buf, regsize);
+ pc = extract_unsigned_integer (tmp, regsize);
+ if (pc >= 0x1000000)
+ {
+ pc -= 0x1000000;
+ write_register (HARD_PAGE_REGNUM, (pc >> 14) & 0x0ff);
+ pc &= 0x03fff;
+ write_register (HARD_PC_REGNUM, pc + 0x8000);
+ }
+ else
+ write_register (HARD_PC_REGNUM, pc);
+ return;
+ }
+
m68hc11_initialize_register_info ();
/* Store a soft register: translate into a memory write. */
static const char *
m68hc11_register_name (int reg_nr)
{
+ if (reg_nr == M68HC12_HARD_PC_REGNUM && USE_PAGE_REGISTER)
+ return "pc";
+ if (reg_nr == HARD_PC_REGNUM && USE_PAGE_REGISTER)
+ return "ppc";
+
if (reg_nr < 0)
return NULL;
if (reg_nr >= M68HC11_ALL_REGS)
static CORE_ADDR
m68hc11_frame_args_address (struct frame_info *frame)
{
- return frame->frame + frame->extra_info->size + STACK_CORRECTION + 2;
+ CORE_ADDR addr;
+
+ addr = frame->frame + frame->extra_info->size + STACK_CORRECTION + 2;
+ if (frame->extra_info->return_kind == RETURN_RTC)
+ addr += 1;
+ else if (frame->extra_info->return_kind == RETURN_RTI)
+ addr += 7;
+
+ return addr;
}
static CORE_ADDR
return 0;
}
+/* Return the instruction that the function at the PC is using. */
+static enum insn_return_kind
+m68hc11_get_return_insn (CORE_ADDR pc)
+{
+ struct minimal_symbol *sym;
+
+ /* A flag indicating that this is a STO_M68HC12_FAR or STO_M68HC12_INTERRUPT
+ function is stored by elfread.c in the high bit of the info field.
+ Use this to decide which instruction the function uses to return. */
+ sym = lookup_minimal_symbol_by_pc (pc);
+ if (sym == 0)
+ return RETURN_RTS;
+
+ if (MSYMBOL_IS_RTC (sym))
+ return RETURN_RTC;
+ else if (MSYMBOL_IS_RTI (sym))
+ return RETURN_RTI;
+ else
+ return RETURN_RTS;
+}
+
+
/* Analyze the function prologue to find some information
about the function:
- the PC of the first line (for m68hc11_skip_prologue)
{
CORE_ADDR pc;
CORE_ADDR addr;
-
+
if (fi->saved_regs == NULL)
frame_saved_regs_zalloc (fi);
else
memset (fi->saved_regs, 0, sizeof (fi->saved_regs));
pc = fi->pc;
+ fi->extra_info->return_kind = m68hc11_get_return_insn (pc);
m68hc11_guess_from_prologue (pc, fi->frame, &pc, &fi->extra_info->size,
fi->saved_regs);
addr = fi->frame + fi->extra_info->size + STACK_CORRECTION;
if (soft_regs[SOFT_FP_REGNUM].name)
fi->saved_regs[SOFT_FP_REGNUM] = addr - 2;
+
+ /* Take into account how the function was called/returns. */
+ if (fi->extra_info->return_kind == RETURN_RTC)
+ {
+ fi->saved_regs[HARD_PAGE_REGNUM] = addr;
+ addr++;
+ }
+ else if (fi->extra_info->return_kind == RETURN_RTI)
+ {
+ fi->saved_regs[HARD_CCR_REGNUM] = addr;
+ fi->saved_regs[HARD_D_REGNUM] = addr + 1;
+ fi->saved_regs[HARD_X_REGNUM] = addr + 3;
+ fi->saved_regs[HARD_Y_REGNUM] = addr + 5;
+ addr += 7;
+ }
fi->saved_regs[HARD_SP_REGNUM] = addr;
fi->saved_regs[HARD_PC_REGNUM] = fi->saved_regs[HARD_SP_REGNUM];
}
if (fromleaf)
{
+ fi->extra_info->return_kind = m68hc11_get_return_insn (fi->pc);
fi->extra_info->return_pc = m68hc11_saved_pc_after_call (fi);
}
else
{
- addr = fi->frame + fi->extra_info->size + STACK_CORRECTION;
+ addr = fi->saved_regs[HARD_PC_REGNUM];
addr = read_memory_unsigned_integer (addr, 2) & 0x0ffff;
+
+ /* Take into account the 68HC12 specific call (PC + page). */
+ if (fi->extra_info->return_kind == RETURN_RTC
+ && addr >= 0x08000 && addr < 0x0c000
+ && USE_PAGE_REGISTER)
+ {
+ CORE_ADDR page_addr = fi->saved_regs[HARD_PAGE_REGNUM];
+
+ unsigned page = read_memory_unsigned_integer (page_addr, 1);
+ addr -= 0x08000;
+ addr += ((page & 0x0ff) << 14);
+ addr += 0x1000000;
+ }
fi->extra_info->return_pc = addr;
-#if 0
- printf ("Pc@0x%04x, FR 0x%04x, size %d, read ret @0x%04x -> 0x%04x\n",
- fi->pc,
- fi->frame, fi->size,
- addr & 0x0ffff,
- fi->return_pc);
-#endif
}
}
ccr & M6811_V_BIT ? 'V' : '-',
ccr & M6811_C_BIT ? 'C' : '-');
- printf_filtered ("D=%04x IX=%04x IY=%04x\n",
+ printf_filtered ("D=%04x IX=%04x IY=%04x",
(int) read_register (HARD_D_REGNUM),
(int) read_register (HARD_X_REGNUM),
(int) read_register (HARD_Y_REGNUM));
+ if (USE_PAGE_REGISTER)
+ {
+ printf_filtered (" Page=%02x",
+ (int) read_register (HARD_PAGE_REGNUM));
+ }
+ printf_filtered ("\n");
+
nr = 0;
for (i = SOFT_D1_REGNUM; i < M68HC11_ALL_REGS; i++)
{
static struct type *
m68hc11_register_virtual_type (int reg_nr)
{
- return builtin_type_uint16;
+ switch (reg_nr)
+ {
+ case HARD_PAGE_REGNUM:
+ case HARD_A_REGNUM:
+ case HARD_B_REGNUM:
+ case HARD_CCR_REGNUM:
+ return builtin_type_uint8;
+
+ case M68HC12_HARD_PC_REGNUM:
+ return builtin_type_uint32;
+
+ default:
+ return builtin_type_uint16;
+ }
}
static void
static int
m68hc11_register_raw_size (int reg_nr)
{
- return M68HC11_REG_SIZE;
+ switch (reg_nr)
+ {
+ case HARD_PAGE_REGNUM:
+ case HARD_A_REGNUM:
+ case HARD_B_REGNUM:
+ case HARD_CCR_REGNUM:
+ return 1;
+
+ case M68HC12_HARD_PC_REGNUM:
+ return 4;
+
+ default:
+ return M68HC11_REG_SIZE;
+ }
+}
+
+/* Test whether the ELF symbol corresponds to a function using rtc or
+ rti to return. */
+
+static void
+m68hc11_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
+{
+ unsigned char flags;
+
+ flags = ((elf_symbol_type *)sym)->internal_elf_sym.st_other;
+ if (flags & STO_M68HC12_FAR)
+ MSYMBOL_SET_RTC (msym);
+ if (flags & STO_M68HC12_INTERRUPT)
+ MSYMBOL_SET_RTI (msym);
}
static int
{
case bfd_arch_m68hc11:
tdep->stack_correction = 1;
+ tdep->use_page_register = 0;
tdep->prologue = m6811_prologue;
+ set_gdbarch_addr_bit (gdbarch, 16);
+ set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS);
+ set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM);
+ set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS);
break;
case bfd_arch_m68hc12:
tdep->stack_correction = 0;
+ tdep->use_page_register = elf_flags & E_M68HC12_BANKS;
tdep->prologue = m6812_prologue;
+ set_gdbarch_addr_bit (gdbarch, elf_flags & E_M68HC12_BANKS ? 32 : 16);
+ set_gdbarch_num_pseudo_regs (gdbarch,
+ elf_flags & E_M68HC12_BANKS
+ ? M68HC12_NUM_PSEUDO_REGS
+ : M68HC11_NUM_PSEUDO_REGS);
+ set_gdbarch_pc_regnum (gdbarch, elf_flags & E_M68HC12_BANKS
+ ? M68HC12_HARD_PC_REGNUM : HARD_PC_REGNUM);
+ set_gdbarch_num_regs (gdbarch, elf_flags & E_M68HC12_BANKS
+ ? M68HC12_NUM_REGS : M68HC11_NUM_REGS);
break;
default:
set_gdbarch_read_sp (gdbarch, generic_target_read_sp);
set_gdbarch_write_sp (gdbarch, generic_target_write_sp);
- set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS);
- set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS);
set_gdbarch_sp_regnum (gdbarch, HARD_SP_REGNUM);
set_gdbarch_fp_regnum (gdbarch, SOFT_FP_REGNUM);
- set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM);
set_gdbarch_register_name (gdbarch, m68hc11_register_name);
set_gdbarch_register_size (gdbarch, 2);
set_gdbarch_register_bytes (gdbarch, M68HC11_ALL_REGS * 2);
set_gdbarch_stack_align (gdbarch, m68hc11_stack_align);
set_gdbarch_print_insn (gdbarch, gdb_print_insn_m68hc11);
+ /* Minsymbol frobbing. */
+ set_gdbarch_elf_make_msymbol_special (gdbarch,
+ m68hc11_elf_make_msymbol_special);
+
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
return gdbarch;
projects / deliverable / binutils-gdb.git / blobdiff