[PATCH] [WineDbg]: fix printing of fp registers for x86_64 CPU
Eric Pouech
eric.pouech at orange.fr
Tue May 8 12:52:34 CDT 2012
(spotted by gcc 4.7 warning)
A+
---
programs/winedbg/be_x86_64.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/programs/winedbg/be_x86_64.c b/programs/winedbg/be_x86_64.c
index 0dd11c2..dde30f3 100644
--- a/programs/winedbg/be_x86_64.c
+++ b/programs/winedbg/be_x86_64.c
@@ -70,6 +70,14 @@ static void be_x86_64_single_step(CONTEXT* ctx, unsigned enable)
else ctx->EFlags &= ~STEP_FLAG;
}
+static inline long double m128a_to_longdouble(const M128A m)
+{
+ /* gcc uses the same IEEE-754 representation as M128A for long double
+ * but 16 byte aligned (hence only the first 10 bytes out of the 16 are used)
+ */
+ return *(long double*)&m;
+}
+
static void be_x86_64_print_context(HANDLE hThread, const CONTEXT* ctx,
int all_regs)
{
@@ -144,16 +152,12 @@ static void be_x86_64_print_context(HANDLE hThread, const CONTEXT* ctx,
for (i = 0; i < 4; i++)
{
- long double st;
- memcpy(&st, &ctx->u.FltSave.FloatRegisters[i * 10], 10);
- dbg_printf(" st%u:%-16Lg ", i, st);
+ dbg_printf(" st%u:%-16Lg ", i, m128a_to_longdouble(ctx->u.FltSave.FloatRegisters[i]));
}
dbg_printf("\n");
for (i = 4; i < 8; i++)
{
- long double st;
- memcpy(&st, &ctx->u.FltSave.FloatRegisters[i * 10], 10);
- dbg_printf(" st%u:%-16Lg ", i, st);
+ dbg_printf(" st%u:%-16Lg ", i, m128a_to_longdouble(ctx->u.FltSave.FloatRegisters[i]));
}
dbg_printf("\n");
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