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John Gilmore
1991-04-05 09:02:10 +00:00
parent 07d021a6ae
commit 3f2e006b77
16 changed files with 367 additions and 146 deletions
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10
gdb/values.c
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@@ -1111,6 +1111,11 @@ unpack_field_as_long (type, valaddr, fieldno)
return val;
}
/* Modify the value of a bitfield. ADDR points to a block of memory in
target byte order; the bitfield starts in the byte pointed to. FIELDVAL
is the desired value of the field, in host byte order. BITPOS and BITSIZE
indicate which bits (in target bit order) comprise the bitfield. */
void
modify_field (addr, fieldval, bitpos, bitsize)
char *addr;
@@ -1125,14 +1130,17 @@ modify_field (addr, fieldval, bitpos, bitsize)
error ("Value %d does not fit in %d bits.", fieldval, bitsize);
bcopy (addr, &oword, sizeof oword);
SWAP_TARGET_AND_HOST (&oword, sizeof oword); /* To host format */
/* Shifting for bit field depends on endianness of the machine. */
/* Shifting for bit field depends on endianness of the target machine. */
#ifdef BITS_BIG_ENDIAN
bitpos = sizeof (oword) * 8 - bitpos - bitsize;
#endif
oword &= ~(((1 << bitsize) - 1) << bitpos);
oword |= fieldval << bitpos;
SWAP_TARGET_AND_HOST (&oword, sizeof oword); /* To target format */
bcopy (&oword, addr, sizeof oword);
}