/* Target-dependent code for the Acorn Risc Machine, for GDB, the GNU Debugger.
- Copyright 1988, 1989, 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
+ Copyright (C) 1988, 1989, 1991, 1992, 1993, 1995, 1996
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
+#include "gdbcmd.h"
-#if 0
-#include "gdbcore.h"
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <signal.h>
-#include <sys/ioctl.h>
-#include <sys/ptrace.h>
-#include <machine/reg.h>
+/* Set to true if the 32-bit mode is in use. */
-#define N_TXTADDR(hdr) 0x8000
-#define N_DATADDR(hdr) (hdr.a_text + 0x8000)
+int arm_apcs_32 = 1;
-#include <sys/user.h> /* After a.out.h */
-#include <sys/file.h>
-#include <sys/stat.h>
-
-#include <errno.h>
-#endif
-
-\f
-#if 0
-/* Work with core dump and executable files, for GDB.
- This code would be in core.c if it weren't machine-dependent. */
-
-/* Structure to describe the chain of shared libraries used
- by the execfile.
- e.g. prog shares Xt which shares X11 which shares c. */
-
-struct shared_library {
- struct exec_header header;
- char name[SHLIBLEN];
- CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */
- long data_offset; /* offset of data section in file */
- int chan; /* file descriptor for the file */
- struct shared_library *shares; /* library this one shares */
-};
-static struct shared_library *shlib = 0;
-
-/* Hook for `exec_file_command' command to call. */
-
-extern void (*exec_file_display_hook) ();
-
-static CORE_ADDR unshared_text_start;
-
-/* extended header from exec file (for shared library info) */
-
-static struct exec_header exec_header;
-
-void
-exec_file_command (filename, from_tty)
- char *filename;
- int from_tty;
+CORE_ADDR
+arm_addr_bits_remove (val)
+CORE_ADDR val;
{
- int val;
-
- /* Eliminate all traces of old exec file.
- Mark text segment as empty. */
-
- if (execfile)
- free (execfile);
- execfile = 0;
- data_start = 0;
- data_end -= exec_data_start;
- text_start = 0;
- unshared_text_start = 0;
- text_end = 0;
- exec_data_start = 0;
- exec_data_end = 0;
- if (execchan >= 0)
- close (execchan);
- execchan = -1;
- if (shlib) {
- close_shared_library(shlib);
- shlib = 0;
- }
-
- /* Now open and digest the file the user requested, if any. */
-
- if (filename)
- {
- filename = tilde_expand (filename);
- make_cleanup (free, filename);
-
- execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &execfile);
- if (execchan < 0)
- perror_with_name (filename);
-
- {
- struct stat st_exec;
-
-#ifdef HEADER_SEEK_FD
- HEADER_SEEK_FD (execchan);
-#endif
-
- val = myread (execchan, &exec_header, sizeof exec_header);
- exec_aouthdr = exec_header.a_exec;
-
- if (val < 0)
- perror_with_name (filename);
-
- text_start = 0x8000;
-
- /* Look for shared library if needed */
- if (exec_header.a_exec.a_magic & MF_USES_SL)
- shlib = open_shared_library(exec_header.a_shlibname, text_start);
-
- text_offset = N_TXTOFF (exec_aouthdr);
- exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
-
- if (shlib) {
- unshared_text_start = shared_text_end(shlib) & ~0x7fff;
- stack_start = shlib->header.a_exec.a_sldatabase;
- stack_end = STACK_END_ADDR;
- } else
- unshared_text_start = 0x8000;
- text_end = unshared_text_start + exec_aouthdr.a_text;
-
- exec_data_start = unshared_text_start + exec_aouthdr.a_text;
- exec_data_end = exec_data_start + exec_aouthdr.a_data;
-
- data_start = exec_data_start;
- data_end += exec_data_start;
-
- fstat (execchan, &st_exec);
- exec_mtime = st_exec.st_mtime;
- }
-
- validate_files ();
- }
- else if (from_tty)
- printf ("No exec file now.\n");
-
- /* Tell display code (if any) about the changed file name. */
- if (exec_file_display_hook)
- (*exec_file_display_hook) (filename);
+ return (val & (arm_apcs_32 ? 0xfffffffc : 0x03fffffc));
}
-#endif
-
-#if 0
-/* Read from the program's memory (except for inferior processes).
- This function is misnamed, since it only reads, never writes; and
- since it will use the core file and/or executable file as necessary.
- It should be extended to write as well as read, FIXME, for patching files.
-
- Return 0 if address could be read, EIO if addresss out of bounds. */
-
-int
-xfer_core_file (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
+CORE_ADDR
+arm_saved_pc_after_call (frame)
+ struct frame_info *frame;
{
- register int i;
- register int val;
- int xferchan;
- char **xferfile;
- int fileptr;
- int returnval = 0;
-
- while (len > 0)
- {
- xferfile = 0;
- xferchan = 0;
-
- /* Determine which file the next bunch of addresses reside in,
- and where in the file. Set the file's read/write pointer
- to point at the proper place for the desired address
- and set xferfile and xferchan for the correct file.
-
- If desired address is nonexistent, leave them zero.
-
- i is set to the number of bytes that can be handled
- along with the next address.
-
- We put the most likely tests first for efficiency. */
-
- /* Note that if there is no core file
- data_start and data_end are equal. */
- if (memaddr >= data_start && memaddr < data_end)
- {
- i = min (len, data_end - memaddr);
- fileptr = memaddr - data_start + data_offset;
- xferfile = &corefile;
- xferchan = corechan;
- }
- /* Note that if there is no core file
- stack_start and stack_end define the shared library data. */
- else if (memaddr >= stack_start && memaddr < stack_end)
- {
- if (corechan < 0) {
- struct shared_library *lib;
- for (lib = shlib; lib; lib = lib->shares)
- if (memaddr >= lib->header.a_exec.a_sldatabase &&
- memaddr < lib->header.a_exec.a_sldatabase +
- lib->header.a_exec.a_data)
- break;
- if (lib) {
- i = min (len, lib->header.a_exec.a_sldatabase +
- lib->header.a_exec.a_data - memaddr);
- fileptr = lib->data_offset + memaddr -
- lib->header.a_exec.a_sldatabase;
- xferfile = execfile;
- xferchan = lib->chan;
- }
- } else {
- i = min (len, stack_end - memaddr);
- fileptr = memaddr - stack_start + stack_offset;
- xferfile = &corefile;
- xferchan = corechan;
- }
- }
- else if (corechan < 0
- && memaddr >= exec_data_start && memaddr < exec_data_end)
- {
- i = min (len, exec_data_end - memaddr);
- fileptr = memaddr - exec_data_start + exec_data_offset;
- xferfile = &execfile;
- xferchan = execchan;
- }
- else if (memaddr >= text_start && memaddr < text_end)
- {
- struct shared_library *lib;
- for (lib = shlib; lib; lib = lib->shares)
- if (memaddr >= lib->text_start &&
- memaddr < lib->text_start + lib->header.a_exec.a_text)
- break;
- if (lib) {
- i = min (len, lib->header.a_exec.a_text +
- lib->text_start - memaddr);
- fileptr = memaddr - lib->text_start + text_offset;
- xferfile = &execfile;
- xferchan = lib->chan;
- } else {
- i = min (len, text_end - memaddr);
- fileptr = memaddr - unshared_text_start + text_offset;
- xferfile = &execfile;
- xferchan = execchan;
- }
- }
- else if (memaddr < text_start)
- {
- i = min (len, text_start - memaddr);
- }
- else if (memaddr >= text_end
- && memaddr < (corechan >= 0? data_start : exec_data_start))
- {
- i = min (len, data_start - memaddr);
- }
- else if (corechan >= 0
- && memaddr >= data_end && memaddr < stack_start)
- {
- i = min (len, stack_start - memaddr);
- }
- else if (corechan < 0 && memaddr >= exec_data_end)
- {
- i = min (len, - memaddr);
- }
- else if (memaddr >= stack_end && stack_end != 0)
- {
- i = min (len, - memaddr);
- }
- else
- {
- /* Address did not classify into one of the known ranges.
- This shouldn't happen; we catch the endpoints. */
- fatal ("Internal: Bad case logic in xfer_core_file.");
- }
-
- /* Now we know which file to use.
- Set up its pointer and transfer the data. */
- if (xferfile)
- {
- if (*xferfile == 0)
- if (xferfile == &execfile)
- error ("No program file to examine.");
- else
- error ("No core dump file or running program to examine.");
- val = lseek (xferchan, fileptr, 0);
- if (val < 0)
- perror_with_name (*xferfile);
- val = myread (xferchan, myaddr, i);
- if (val < 0)
- perror_with_name (*xferfile);
- }
- /* If this address is for nonexistent memory,
- read zeros if reading, or do nothing if writing.
- Actually, we never right. */
- else
- {
- memset (myaddr, '\0', i);
- returnval = EIO;
- }
-
- memaddr += i;
- myaddr += i;
- len -= i;
- }
- return returnval;
+ return ADDR_BITS_REMOVE (read_register (LR_REGNUM));
}
-#endif
-\f
+
/* APCS (ARM procedure call standard) defines the following prologue:
mov ip, sp
*/
CORE_ADDR
-skip_prologue(pc)
+arm_skip_prologue (pc)
CORE_ADDR pc;
{
- CORE_ADDR skip_pc = pc;
-#if 0
- union insn_fmt op;
-
- op.ins = read_memory_integer(skip_pc, 4);
- /* look for the "mov ip,sp" */
- if (op.generic.type != TYPE_ARITHMETIC ||
- op.arith.opcode != OPCODE_MOV ||
- op.arith.dest != SPTEMP ||
- op.arith.operand2 != SP) return pc;
- skip_pc += 4;
- /* skip the "stmfd sp!,{a1,a2,a3,a4}" if its there */
- op.ins = read_memory_integer(skip_pc, 4);
- if (op.generic.type == TYPE_BLOCK_BRANCH &&
- op.generic.subtype == SUBTYPE_BLOCK &&
- op.block.mask == 0xf &&
- op.block.base == SP &&
- op.block.is_load == 0 &&
- op.block.writeback == 1 &&
- op.block.increment == 0 &&
- op.block.before == 1) skip_pc += 4;
- /* skip the "stmfd sp!,{...,fp,ip,lr,pc} */
- op.ins = read_memory_integer(skip_pc, 4);
- if (op.generic.type != TYPE_BLOCK_BRANCH ||
- op.generic.subtype != SUBTYPE_BLOCK ||
- /* the mask should look like 110110xxxxxx0000 */
- (op.block.mask & 0xd800) != 0xd800 ||
- op.block.base != SP ||
- op.block.is_load != 0 ||
- op.block.writeback != 1 ||
- op.block.increment != 0 ||
- op.block.before != 1) return pc;
+ unsigned long inst;
+ CORE_ADDR skip_pc = pc;
+
+ inst = read_memory_integer (skip_pc, 4);
+ if (inst != 0xe1a0c00d) /* mov ip, sp */
+ return pc;
+
+ skip_pc += 4;
+ inst = read_memory_integer (skip_pc, 4);
+ if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */
+ {
+ skip_pc += 4;
+ inst = read_memory_integer (skip_pc, 4);
+ }
+
+ if ((inst & 0xfffff800) != 0xe92dd800) /* stmfd sp!,{...,fp,ip,lr,pc} */
+ return pc;
+
+ skip_pc += 4;
+ inst = read_memory_integer (skip_pc, 4);
+
+ /* Any insns after this point may float into the code, if it makes
+ for better instruction scheduling, so we skip them only if
+ we find them, but still consdier the function to be frame-ful */
+
+ /* We may have either one sfmfd instruction here, or several stfe insns,
+ depending on the version of floating point code we support. */
+ if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */
+ {
+ skip_pc += 4;
+ inst = read_memory_integer (skip_pc, 4);
+ }
+ else
+ {
+ while ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */
+ {
+ skip_pc += 4;
+ inst = read_memory_integer (skip_pc, 4);
+ }
+ }
+
+ if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */
skip_pc += 4;
- /* check for "sub fp,ip,#nn" */
- op.ins = read_memory_integer(skip_pc, 4);
- if (op.generic.type != TYPE_ARITHMETIC ||
- op.arith.opcode != OPCODE_SUB ||
- op.arith.dest != FP ||
- op.arith.operand1 != SPTEMP) return pc;
-#endif
- return skip_pc + 4;
+
+ return skip_pc;
}
void
saved_regs_addr->regs[FP_REGNUM] = frame - 12;
}
+void
+arm_push_dummy_frame ()
+{
+ register CORE_ADDR sp = read_register (SP_REGNUM);
+ register int regnum;
+
+ /* opcode for ldmdb fp,{v1-v6,fp,ip,lr,pc}^ */
+ sp = push_word (sp, 0xe92dbf0); /* dummy return_data_save ins */
+ /* push a pointer to the dummy instruction minus 12 */
+ sp = push_word (sp, read_register (SP_REGNUM) - 16);
+ sp = push_word (sp, read_register (PS_REGNUM));
+ sp = push_word (sp, read_register (SP_REGNUM));
+ sp = push_word (sp, read_register (FP_REGNUM));
+ for (regnum = 9; regnum >= 4; regnum --)
+ sp = push_word (sp, read_register (regnum));
+ write_register (FP_REGNUM, read_register (SP_REGNUM) - 8);
+ write_register (SP_REGNUM, sp);
+}
+
+void
+arm_pop_frame ()
+{
+ register CORE_ADDR fp = read_register (FP_REGNUM);
+ register unsigned long return_data_save =
+ read_memory_integer (ADDR_BITS_REMOVE (read_memory_integer (fp, 4)) - 12,
+ 4);
+ register int regnum;
+
+ write_register (PS_REGNUM, read_memory_integer (fp - 4, 4));
+ write_register (PC_REGNUM, ADDR_BITS_REMOVE (read_register (PS_REGNUM)));
+ write_register (SP_REGNUM, read_memory_integer (fp - 8, 4));
+ write_register (FP_REGNUM, read_memory_integer (fp - 12, 4));
+ fp -= 12;
+ for (regnum = 9; regnum >= 4; regnum--)
+ {
+ if (return_data_save & (1 << regnum))
+ {
+ fp -= 4;
+ write_register (regnum, read_memory_integer (fp, 4));
+ }
+ }
+ flush_cached_frames ();
+}
+
static void
-print_fpu_flags(flags)
+print_fpu_flags (flags)
int flags;
{
- if (flags & (1 << 0)) fputs("IVO ", stdout);
- if (flags & (1 << 1)) fputs("DVZ ", stdout);
- if (flags & (1 << 2)) fputs("OFL ", stdout);
- if (flags & (1 << 3)) fputs("UFL ", stdout);
- if (flags & (1 << 4)) fputs("INX ", stdout);
- putchar('\n');
+ if (flags & (1 << 0)) fputs ("IVO ", stdout);
+ if (flags & (1 << 1)) fputs ("DVZ ", stdout);
+ if (flags & (1 << 2)) fputs ("OFL ", stdout);
+ if (flags & (1 << 3)) fputs ("UFL ", stdout);
+ if (flags & (1 << 4)) fputs ("INX ", stdout);
+ putchar ('\n');
}
void
-arm_float_info()
+arm_float_info ()
{
- register unsigned long status = read_register(FPS_REGNUM);
+ register unsigned long status = read_register (FPS_REGNUM);
int type;
type = (status >> 24) & 127;
- printf("%s FPU type %d\n",
- (status & (1<<31)) ? "Hardware" : "Software",
- type);
- fputs("mask: ", stdout);
- print_fpu_flags(status >> 16);
- fputs("flags: ", stdout);
- print_fpu_flags(status);
+ printf ("%s FPU type %d\n",
+ (status & (1<<31)) ? "Hardware" : "Software",
+ type);
+ fputs ("mask: ", stdout);
+ print_fpu_flags (status >> 16);
+ fputs ("flags: ", stdout);
+ print_fpu_flags (status);
}
-void
-_initialize_arm_tdep ()
+static void
+arm_othernames ()
{
- tm_print_insn = print_insn_arm;
-}
+ static int toggle;
+ static char *original[] = ORIGINAL_REGISTER_NAMES;
+ static char *extra_crispy[] = ADDITIONAL_REGISTER_NAMES;
+ memcpy (reg_names, toggle ? extra_crispy : original, sizeof(original));
+ toggle = !toggle;
+}
/* FIXME: Fill in with the 'right thing', see asm
template in arm-convert.s */
*dbl = *(double*)ptr;
}
-
void
convert_to_extended (dbl, ptr)
void *ptr;
*(double*)ptr = *dbl;
}
+int
+arm_nullified_insn (inst)
+ unsigned long inst;
+{
+ unsigned long cond = inst & 0xf0000000;
+ unsigned long status_reg;
+
+ if (cond == INST_AL || cond == INST_NV)
+ return 0;
+
+ status_reg = read_register (PS_REGNUM);
+
+ switch (cond)
+ {
+ case INST_EQ:
+ return ((status_reg & FLAG_Z) == 0);
+ case INST_NE:
+ return ((status_reg & FLAG_Z) != 0);
+ case INST_CS:
+ return ((status_reg & FLAG_C) == 0);
+ case INST_CC:
+ return ((status_reg & FLAG_C) != 0);
+ case INST_MI:
+ return ((status_reg & FLAG_N) == 0);
+ case INST_PL:
+ return ((status_reg & FLAG_N) != 0);
+ case INST_VS:
+ return ((status_reg & FLAG_V) == 0);
+ case INST_VC:
+ return ((status_reg & FLAG_V) != 0);
+ case INST_HI:
+ return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
+ case INST_LS:
+ return (((status_reg & (FLAG_C | FLAG_Z)) ^ FLAG_C) == 0);
+ case INST_GE:
+ return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
+ case INST_LT:
+ return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
+ case INST_GT:
+ return (((status_reg & FLAG_Z) != 0) ||
+ (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)));
+ case INST_LE:
+ return (((status_reg & FLAG_Z) == 0) &&
+ (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)));
+ }
+ return 0;
+}
+
+#define submask(x) ((1L << ((x) + 1)) - 1)
+#define bit(obj,st) (((obj) & (1L << (st))) >> st)
+#define bits(obj,st,fn) \
+ (((obj) & submask (fn) & ~ submask ((st) - 1)) >> (st))
+#define sbits(obj,st,fn) \
+ ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
+#define BranchDest(addr,instr) \
+ ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
+#define ARM_PC_32 1
+
+static unsigned long
+shifted_reg_val (inst, carry, pc_val)
+ unsigned long inst;
+ int carry;
+ unsigned long pc_val;
+{
+ unsigned long res, shift;
+ int rm = bits (inst, 0, 3);
+ unsigned long shifttype = bits (inst, 5, 6);
+
+ if (bit(inst, 4))
+ {
+ int rs = bits (inst, 8, 11);
+ shift = (rs == 15 ? pc_val + 8 : read_register (rs)) & 0xFF;
+ }
+ else
+ shift = bits (inst, 7, 11);
+
+ res = (rm == 15
+ ? ((pc_val | (ARM_PC_32 ? 0 : read_register (PS_REGNUM)))
+ + (bit (inst, 4) ? 12 : 8))
+ : read_register (rm));
+
+ switch (shifttype)
+ {
+ case 0: /* LSL */
+ res = shift >= 32 ? 0 : res << shift;
+ break;
+
+ case 1: /* LSR */
+ res = shift >= 32 ? 0 : res >> shift;
+ break;
+
+ case 2: /* ASR */
+ if (shift >= 32) shift = 31;
+ res = ((res & 0x80000000L)
+ ? ~((~res) >> shift) : res >> shift);
+ break;
+
+ case 3: /* ROR/RRX */
+ shift &= 31;
+ if (shift == 0)
+ res = (res >> 1) | (carry ? 0x80000000L : 0);
+ else
+ res = (res >> shift) | (res << (32-shift));
+ break;
+ }
+
+ return res & 0xffffffff;
+}
+
+
+CORE_ADDR
+arm_get_next_pc (pc)
+ CORE_ADDR pc;
+{
+ unsigned long pc_val = (unsigned long) pc;
+ unsigned long this_instr = read_memory_integer (pc, 4);
+ unsigned long status = read_register (PS_REGNUM);
+ CORE_ADDR nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */
+
+ if (! arm_nullified_insn (this_instr))
+ {
+ switch (bits(this_instr, 24, 27))
+ {
+ case 0x0: case 0x1: /* data processing */
+ case 0x2: case 0x3:
+ {
+ unsigned long operand1, operand2, result = 0;
+ unsigned long rn;
+ int c;
+
+ if (bits(this_instr, 12, 15) != 15)
+ break;
+
+ if (bits (this_instr, 22, 25) == 0
+ && bits (this_instr, 4, 7) == 9) /* multiply */
+ error ("Illegal update to pc in instruction");
+
+ /* Multiply into PC */
+ c = (status & FLAG_C) ? 1 : 0;
+ rn = bits (this_instr, 16, 19);
+ operand1 = (rn == 15) ? pc_val + 8 : read_register (rn);
+
+ if (bit (this_instr, 25))
+ {
+ unsigned long immval = bits (this_instr, 0, 7);
+ unsigned long rotate = 2 * bits (this_instr, 8, 11);
+ operand2 = ((immval >> rotate) | (immval << (32-rotate))
+ & 0xffffffff);
+ }
+ else /* operand 2 is a shifted register */
+ operand2 = shifted_reg_val (this_instr, c, pc_val);
+
+ switch (bits (this_instr, 21, 24))
+ {
+ case 0x0: /*and*/
+ result = operand1 & operand2;
+ break;
+
+ case 0x1: /*eor*/
+ result = operand1 ^ operand2;
+ break;
+
+ case 0x2: /*sub*/
+ result = operand1 - operand2;
+ break;
+
+ case 0x3: /*rsb*/
+ result = operand2 - operand1;
+ break;
+
+ case 0x4: /*add*/
+ result = operand1 + operand2;
+ break;
+
+ case 0x5: /*adc*/
+ result = operand1 + operand2 + c;
+ break;
+
+ case 0x6: /*sbc*/
+ result = operand1 - operand2 + c;
+ break;
+
+ case 0x7: /*rsc*/
+ result = operand2 - operand1 + c;
+ break;
+
+ case 0x8: case 0x9: case 0xa: case 0xb: /* tst, teq, cmp, cmn */
+ result = (unsigned long) nextpc;
+ break;
+
+ case 0xc: /*orr*/
+ result = operand1 | operand2;
+ break;
+
+ case 0xd: /*mov*/
+ /* Always step into a function. */
+ result = operand2;
+ break;
+
+ case 0xe: /*bic*/
+ result = operand1 & ~operand2;
+ break;
+
+ case 0xf: /*mvn*/
+ result = ~operand2;
+ break;
+ }
+ nextpc = (CORE_ADDR) ADDR_BITS_REMOVE (result);
+
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ break;
+ }
+
+ case 0x4: case 0x5: /* data transfer */
+ case 0x6: case 0x7:
+ if (bit (this_instr, 20))
+ {
+ /* load */
+ if (bits (this_instr, 12, 15) == 15)
+ {
+ /* rd == pc */
+ unsigned long rn;
+ unsigned long base;
+
+ if (bit (this_instr, 22))
+ error ("Illegal update to pc in instruction");
+
+ /* byte write to PC */
+ rn = bits (this_instr, 16, 19);
+ base = (rn == 15) ? pc_val + 8 : read_register (rn);
+ if (bit (this_instr, 24))
+ {
+ /* pre-indexed */
+ int c = (status & FLAG_C) ? 1 : 0;
+ unsigned long offset =
+ (bit (this_instr, 25)
+ ? shifted_reg_val (this_instr, c, pc_val)
+ : bits (this_instr, 0, 11));
+
+ if (bit (this_instr, 23))
+ base += offset;
+ else
+ base -= offset;
+ }
+ nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base,
+ 4);
+
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ }
+ }
+ break;
+
+ case 0x8: case 0x9: /* block transfer */
+ if (bit (this_instr, 20))
+ {
+ /* LDM */
+ if (bit (this_instr, 15))
+ {
+ /* loading pc */
+ int offset = 0;
+
+ if (bit (this_instr, 23))
+ {
+ /* up */
+ unsigned long reglist = bits (this_instr, 0, 14);
+ unsigned long regbit;
+
+ for (; reglist != 0; reglist &= ~regbit)
+ {
+ regbit = reglist & (-reglist);
+ offset += 4;
+ }
+
+ if (bit (this_instr, 24)) /* pre */
+ offset += 4;
+ }
+ else if (bit (this_instr, 24))
+ offset = -4;
+
+ {
+ unsigned long rn_val =
+ read_register (bits (this_instr, 16, 19));
+ nextpc =
+ (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val
+ + offset),
+ 4);
+ }
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ }
+ }
+ break;
+
+ case 0xb: /* branch & link */
+ case 0xa: /* branch */
+ {
+ nextpc = BranchDest (pc, this_instr);
+
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ break;
+ }
+
+ case 0xc: case 0xd:
+ case 0xe: /* coproc ops */
+ case 0xf: /* SWI */
+ break;
+
+ default:
+ fprintf (stderr, "Bad bit-field extraction\n");
+ return (pc);
+ }
+ }
+
+ return nextpc;
+}
+
+void
+_initialize_arm_tdep ()
+{
+ tm_print_insn = print_insn_little_arm;
+
+ add_com ("othernames", class_obscure, arm_othernames,
+ "Switch to the other set of register names.");
+
+ add_show_from_set (add_set_cmd ("apcs32", no_class,
+ var_integer, (char *)&arm_apcs_32,
+ "Set usage of ARM 32-bit mode.\n", &setlist),
+ &showlist);
+
+}
projects / deliverable / binutils-gdb.git / blobdiff