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winedbg: Correctly store integers into a bitfield. 

Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Eric Pouech 2021-12-08 14:44:32 +01:00 committed by Alexandre Julliard
parent 860de95630
commit 0ed8cac2cd
1 changed files with 17 additions and 0 deletions
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17
programs/winedbg/memory.c
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@ -317,6 +317,23 @@ BOOL memory_store_integer(const struct dbg_lvalue* lvalue, dbg_lgint_t val)
{
DWORD64 size;
if (!types_get_info(&lvalue->type, TI_GET_LENGTH, &size)) return FALSE;
if (lvalue->bitlen)
{
struct dbg_lvalue alt_lvalue = *lvalue;
dbg_lguint_t mask, dst;
/* FIXME: this test isn't sufficient, depending on start of bitfield
* (ie a 64 bit field can spread across 9 bytes)
*/
if (lvalue->bitlen > 8 * sizeof(dbg_lgint_t)) return FALSE;
/* mask is 1 where bitfield is present, 0 outside */
mask = (~(dbg_lguint_t)0 >> (sizeof(val) * 8 - lvalue->bitlen)) << (lvalue->bitstart & 7);
alt_lvalue.addr.Offset += lvalue->bitstart >> 3;
val <<= lvalue->bitstart & 7;
if (!memory_read_value(&alt_lvalue, (unsigned)size, &dst)) return FALSE;
val = (dst & ~mask) | (val & mask);
return memory_write_value(&alt_lvalue, (unsigned)size, &val);
}
/* this is simple if we're on a little endian CPU */
return memory_write_value(lvalue, (unsigned)size, &val);
}