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-rw-r--r--opcodes/xgate-dis.c162
1 files changed, 82 insertions, 80 deletions
diff --git a/opcodes/xgate-dis.c b/opcodes/xgate-dis.c
index f703055..8c722f5 100644
--- a/opcodes/xgate-dis.c
+++ b/opcodes/xgate-dis.c
@@ -1,5 +1,5 @@
/* xgate-dis.c -- Freescale XGATE disassembly
- Copyright 2009, 2010, 2011
+ Copyright 2009, 2010, 2011, 2012
Free Software Foundation, Inc.
Written by Sean Keys (skeys@ipdatasys.com)
@@ -18,11 +18,10 @@
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., 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA.
-*/
+ MA 02110-1301, USA. */
-#include <assert.h>
#include "sysdep.h"
+#include <assert.h>
#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"
@@ -35,34 +34,31 @@
#define XGATE_NINE_SIGNBIT 0x100
#define XGATE_TEN_SIGNBIT 0x200
-/* Structures */
-struct decodeInfo {
+/* Structures. */
+struct decodeInfo
+{
unsigned int operMask;
unsigned int operMasksRegisterBits;
struct xgate_opcode *opcodePTR;
};
/* Prototypes for local functions. */
-static int
-print_insn( bfd_vma, struct disassemble_info *);
-static int
-read_memory( bfd_vma, bfd_byte*, int, struct disassemble_info *);
-static int
-ripBits(unsigned int *, int,
- struct xgate_opcode *, unsigned int);
-int
-macro_search(char *, char *);
-struct decodeInfo *
-find_match(unsigned int raw_code);
+static int print_insn (bfd_vma, struct disassemble_info *);
+static int read_memory (bfd_vma, bfd_byte*, int, struct disassemble_info *);
+static int ripBits (unsigned int *, int,
+ struct xgate_opcode *, unsigned int);
+static int macro_search (char *, char *);
+static struct decodeInfo * find_match (unsigned int);
-/* statics */
+/* Statics. */
static struct decodeInfo *decodeTable;
static int initialized;
static char previousOpName[10];
static unsigned int perviousBin;
/* Disassemble one instruction at address 'memaddr'. Returns the number
- of bytes used by that instruction. */
+ of bytes used by that instruction. */
+
static int
print_insn (bfd_vma memaddr, struct disassemble_info* info)
{
@@ -82,11 +78,11 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
bfd_vma absAddress;
unsigned int operMaskReg = 0;
- /* initialize our array of opcode masks and check them against our constant
- table */
+ /* Initialize our array of opcode masks and check them against our constant
+ table. */
if (!initialized)
{
- decodeTable = xmalloc(sizeof(struct decodeInfo) * xgate_num_opcodes);
+ decodeTable = xmalloc (sizeof (struct decodeInfo) * xgate_num_opcodes);
for (i = 0, decodeTablePTR = decodeTable; i < xgate_num_opcodes;
i++, decodeTablePTR++, opcodePTR++)
{
@@ -101,33 +97,35 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
mask |= (*s == '0' || *s == '1');
operandRegisterBits |= (*s == 'r');
}
- /* asserting will uncover inconsistencies in our table */
- assert(
- (s - opcodePTR->format) == 16 || (s - opcodePTR->format) == 32);
- assert(opcodePTR->bin_opcode == bin);
+ /* Asserting will uncover inconsistencies in our table. */
+ assert ((s - opcodePTR->format) == 16 || (s - opcodePTR->format) == 32);
+ assert (opcodePTR->bin_opcode == bin);
+
decodeTablePTR->operMask = mask;
decodeTablePTR->operMasksRegisterBits = operandRegisterBits;
decodeTablePTR->opcodePTR = opcodePTR;
}
initialized = 1;
}
- /* read 16 bits */
+
+ /* Read 16 bits. */
bytesRead += XGATE_TWO_BYTES;
- status = read_memory(memaddr, buffer, XGATE_TWO_BYTES, info);
+ status = read_memory (memaddr, buffer, XGATE_TWO_BYTES, info);
if (status == 0)
{
raw_code = buffer[0];
raw_code <<= 8;
raw_code += buffer[1];
- decodePTR = find_match(raw_code);
+ decodePTR = find_match (raw_code);
if (decodePTR)
{
operMaskReg = decodePTR->operMasksRegisterBits;
(*info->fprintf_func)(info->stream, "%s", decodePTR->opcodePTR->name);
+
/* First we compare the shorthand format of the constraints. If we
- still are unable to pinpoint the operands
- we analyze the opcodes constraint string. */
+ still are unable to pinpoint the operands
+ we analyze the opcodes constraint string. */
switch (decodePTR->opcodePTR->sh_format)
{
case XG_R_C:
@@ -145,13 +143,13 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
case XG_INH:
break;
case XG_R_R_R:
- if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_TRI))
+ if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_TRI))
{
(*info->fprintf_func)(info->stream, " R%x, R%x, R%x",
(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7,
(raw_code >> 2) & 0x7);
}
- else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IDR))
+ else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IDR))
{
if (raw_code & 0x01)
{
@@ -179,19 +177,19 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
}
break;
case XG_R_R:
- if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_DYA_MON))
+ if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_DYA_MON))
{
- operandOne = ripBits(&operMaskReg, 3, decodePTR->opcodePTR,
+ operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR,
raw_code);
- operandTwo = ripBits(&operMaskReg, 3, decodePTR->opcodePTR,
+ operandTwo = ripBits (&operMaskReg, 3, decodePTR->opcodePTR,
raw_code);
(*info->fprintf_func)(info->stream, " R%x, R%x", operandOne,
operandTwo);
}
- else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_DYA))
+ else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_DYA))
{
- operandOne = ripBits(&operMaskReg, 3, opcodePTR, raw_code);
- operandTwo = ripBits(&operMaskReg, 3, opcodePTR, raw_code);
+ operandOne = ripBits (&operMaskReg, 3, opcodePTR, raw_code);
+ operandTwo = ripBits (&operMaskReg, 3, opcodePTR, raw_code);
(*info->fprintf_func)(info->stream, " R%x, R%x", operandOne,
operandTwo);
}
@@ -206,20 +204,20 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
(raw_code >> 8) & 0x7, (raw_code >> 5) & 0x7, raw_code & 0x1f);
break;
case XG_R:
- operandOne = ripBits(&operMaskReg, 3, decodePTR->opcodePTR,
+ operandOne = ripBits (&operMaskReg, 3, decodePTR->opcodePTR,
raw_code);
(*info->fprintf_func)(info->stream, " R%x", operandOne);
break;
case XG_I | XG_PCREL:
- if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_REL9))
+ if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL9))
{
- /* if address is negative handle it accordingly */
+ /* If address is negative handle it accordingly. */
if (raw_code & XGATE_NINE_SIGNBIT)
{
- relAddr = XGATE_NINE_BITS >> 1; /* clip sign bit */
- relAddr = ~relAddr; /* make signed */
- relAddr |= (raw_code & 0xFF) + 1; /* apply our value */
- relAddr <<= 1; /* multiply by two as per processor docs */
+ relAddr = XGATE_NINE_BITS >> 1; /* Clip sign bit. */
+ relAddr = ~relAddr; /* Make signed. */
+ relAddr |= (raw_code & 0xFF) + 1; /* Apply our value. */
+ relAddr <<= 1; /* Multiply by two as per processor docs. */
}
else
{
@@ -230,15 +228,15 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
(*info->fprintf_func)(info->stream, " Abs* 0x");
(*info->print_address_func)(memaddr + relAddr, info);
}
- else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_REL10))
+ else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_REL10))
{
- /* if address is negative handle it accordingly */
+ /* If address is negative handle it accordingly. */
if (raw_code & XGATE_TEN_SIGNBIT)
{
- relAddr = XGATE_TEN_BITS >> 1; /* clip sign bit */
- relAddr = ~relAddr; /* make signed */
- relAddr |= (raw_code & 0x1FF) + 1; /* apply our value */
- relAddr <<= 1; /* multiply by two as per processor docs */
+ relAddr = XGATE_TEN_BITS >> 1; /* Clip sign bit. */
+ relAddr = ~relAddr; /* Make signed. */
+ relAddr |= (raw_code & 0x1FF) + 1; /* Apply our value. */
+ relAddr <<= 1; /* Multiply by two as per processor docs. */
}
else
{
@@ -257,14 +255,14 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
}
break;
case XG_R_I:
- if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IMM4))
+ if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM4))
{
(*info->fprintf_func)(info->stream, " R%x, #0x%02x",
(raw_code >> 8) & 0x7, (raw_code >> 4) & 0xF);
}
- else if (!strcmp(decodePTR->opcodePTR->constraints, XGATE_OP_IMM8))
+ else if (!strcmp (decodePTR->opcodePTR->constraints, XGATE_OP_IMM8))
{
- if (macro_search(decodePTR->opcodePTR->name, previousOpName) &&
+ if (macro_search (decodePTR->opcodePTR->name, previousOpName) &&
previousOpName[0])
{
absAddress = (0xFF & raw_code) << 8;
@@ -276,7 +274,7 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
}
else
{
- strcpy(previousOpName, decodePTR->opcodePTR->name);
+ strcpy (previousOpName, decodePTR->opcodePTR->name);
(*info->fprintf_func)(info->stream, " R%x, #0x%02x",
(raw_code >> 8) & 0x7, raw_code & 0xff);
}
@@ -302,7 +300,7 @@ print_insn (bfd_vma memaddr, struct disassemble_info* info)
else
{
(*info->fprintf_func)(info->stream,
- " unable to find opcode match #0%x", raw_code);
+ " unable to find opcode match #0%x", raw_code);
}
}
return bytesRead;
@@ -329,45 +327,51 @@ read_memory (bfd_vma memaddr, bfd_byte* buffer, int size,
}
static int
-ripBits(unsigned int *operandBitsRemaining, int numBitsRequested,
- struct xgate_opcode *opcodePTR, unsigned int memory)
+ripBits (unsigned int *operandBitsRemaining,
+ int numBitsRequested,
+ struct xgate_opcode *opcodePTR,
+ unsigned int memory)
{
unsigned int currentBit;
int operand;
int numBitsFound;
+
for (operand = 0, numBitsFound = 0, currentBit = 1
- << ((opcodePTR->size * 8) - 1);
- (numBitsFound < numBitsRequested) && currentBit; currentBit >>= 1)
+ << ((opcodePTR->size * 8) - 1);
+ (numBitsFound < numBitsRequested) && currentBit; currentBit >>= 1)
{
- if(currentBit & *operandBitsRemaining) {
- *operandBitsRemaining &= ~(currentBit); /* consume the current bit */
- operand <<= 1; /* make room for our next bit */
- numBitsFound++;
- operand |= (currentBit & memory) > 0;
- }
- }
+ if (currentBit & *operandBitsRemaining)
+ {
+ *operandBitsRemaining &= ~(currentBit); /* Consume the current bit. */
+ operand <<= 1; /* Make room for our next bit. */
+ numBitsFound++;
+ operand |= (currentBit & memory) > 0;
+ }
+ }
return operand;
}
-int
-macro_search(char *currentName, char *lastName)
+static int
+macro_search (char *currentName, char *lastName)
{
int i;
int length = 0;
char *where;
+
for (i = 0; i < xgate_num_opcodes; i++)
{
- where = strstr(xgate_opcodes[i].constraints, lastName);
+ where = strstr (xgate_opcodes[i].constraints, lastName);
+
if (where)
{
- length = strlen(where);
+ length = strlen (where);
}
if (length)
{
- where = strstr(xgate_opcodes[i].constraints, currentName);
+ where = strstr (xgate_opcodes[i].constraints, currentName);
if (where)
{
- length = strlen(where);
+ length = strlen (where);
return 1;
}
}
@@ -375,8 +379,8 @@ macro_search(char *currentName, char *lastName)
return 0;
}
-struct decodeInfo*
-find_match(unsigned int raw_code)
+static struct decodeInfo *
+find_match (unsigned int raw_code)
{
struct decodeInfo *decodeTablePTR = 0;
int i;
@@ -387,16 +391,14 @@ find_match(unsigned int raw_code)
if ((raw_code & decodeTablePTR->operMask)
== decodeTablePTR->opcodePTR->bin_opcode)
{
- /* make sure we didn't run into a macro or alias */
+ /* Make sure we didn't run into a macro or alias. */
if (decodeTablePTR->opcodePTR->cycles_min != 0)
{
return decodeTablePTR;
break;
}
else
- {
- continue;
- }
+ continue;
}
}
return 0;