diff options
Diffstat (limited to 'cpu/or1k.opc')
-rw-r--r-- | cpu/or1k.opc | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/cpu/or1k.opc b/cpu/or1k.opc index 5082a30..f0adcbb 100644 --- a/cpu/or1k.opc +++ b/cpu/or1k.opc @@ -40,9 +40,29 @@ #undef CGEN_DIS_HASH #define CGEN_DIS_HASH(buffer, value) (((unsigned char *) (buffer))[0] >> 2) +/* Check applicability of instructions against machines. */ +#define CGEN_VALIDATE_INSN_SUPPORTED + +extern int or1k_cgen_insn_supported (CGEN_CPU_DESC, const CGEN_INSN *); + /* -- */ /* -- opc.c */ + +/* Special check to ensure that instruction exists for given machine. */ + +int +or1k_cgen_insn_supported (CGEN_CPU_DESC cd, const CGEN_INSN *insn) +{ + int machs = CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH); + + /* No mach attribute? Assume it's supported for all machs. */ + if (machs == 0) + return 1; + + return ((machs & cd->machs) != 0); +} + /* -- */ /* -- asm.c */ @@ -415,6 +435,78 @@ parse_uimm16_split (CGEN_CPU_DESC cd, const char **strp, int opindex, return errmsg; } +/* Parse register pairs with syntax rA,rB to a flag + rA value. */ + +static const char * +parse_regpair (CGEN_CPU_DESC cd, const char **strp, + int opindex ATTRIBUTE_UNUSED, unsigned long *valuep) +{ + long reg1_index; + long reg2_index; + const char *errmsg; + + /* The first part should just be a register. */ + errmsg = cgen_parse_keyword (cd, strp, &or1k_cgen_opval_h_gpr, + ®1_index); + + /* If that worked skip the comma separator. */ + if (errmsg == NULL) + { + if (**strp == ',') + ++*strp; + else + errmsg = "Unexpected character, expected ','"; + } + + /* If that worked the next part is just another register. */ + if (errmsg == NULL) + errmsg = cgen_parse_keyword (cd, strp, &or1k_cgen_opval_h_gpr, + ®2_index); + + /* Validate the register pair is valid and create the output value. */ + if (errmsg == NULL) + { + int regoffset = reg2_index - reg1_index; + + if (regoffset == 1 || regoffset == 2) + { + unsigned short offsetmask; + unsigned short value; + + offsetmask = ((regoffset == 2 ? 1 : 0) << 5); + value = offsetmask | reg1_index; + + *valuep = value; + } + else + errmsg = "Invalid register pair, offset not 1 or 2."; + } + + return errmsg; +} + +/* -- */ + +/* -- dis.c */ + +static void +print_regpair (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, + void * dis_info, + long value, + unsigned int attrs ATTRIBUTE_UNUSED, + bfd_vma pc ATTRIBUTE_UNUSED, + int length ATTRIBUTE_UNUSED) +{ + disassemble_info *info = dis_info; + char reg1_index; + char reg2_index; + + reg1_index = value & 0x1f; + reg2_index = reg1_index + ((value & (1 << 5)) ? 2 : 1); + + (*info->fprintf_func) (info->stream, "r%d,r%d", reg1_index, reg2_index); +} + /* -- */ /* -- ibd.h */ |