diff options
Diffstat (limited to 'gdb/arch/arm.c')
| -rw-r--r-- | gdb/arch/arm.c | 60 |
1 files changed, 58 insertions, 2 deletions
diff --git a/gdb/arch/arm.c b/gdb/arch/arm.c index b11c684..426377f 100644 --- a/gdb/arch/arm.c +++ b/gdb/arch/arm.c @@ -20,8 +20,7 @@ #include "common-defs.h" #include "arm.h" -/* Return the size in bytes of the complete Thumb instruction whose - first halfword is INST1. */ +/* See arm.h. */ int thumb_insn_size (unsigned short inst1) @@ -31,3 +30,60 @@ thumb_insn_size (unsigned short inst1) else return 2; } + +/* See arm.h. */ + +int +bitcount (unsigned long val) +{ + int nbits; + for (nbits = 0; val != 0; nbits++) + val &= val - 1; /* Delete rightmost 1-bit in val. */ + return nbits; +} + +/* See arm.h. */ + +int +condition_true (unsigned long cond, unsigned long status_reg) +{ + if (cond == INST_AL || cond == INST_NV) + return 1; + + 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); + 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 1; +} |