diff options
Diffstat (limited to 'opcodes/xgate-dis.c')
| -rw-r--r-- | opcodes/xgate-dis.c | 162 |
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; |