[Qemu-devel] [PATCH v2 8/8] target-i386: x87 exception pointers using TCG.

[Jaume Marti Farriol <jaume.martif@gmail.com>]

Hello,

This patch contains changes to the tests/tcg/test-i386.c file to test the storage of the x87 exception pointers by instructions fnstenv and fxsave.

Best regards,
Jaume

 test-i386.c |   66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 62 insertions(+), 4 deletions(-)

signed-off: jaume.martif@gmail.com
diff --git a/tests/tcg/test-i386.c b/tests/tcg/test-i386.c
index b05572b..3f34c2c 100644
--- a/tests/tcg/test-i386.c
+++ b/tests/tcg/test-i386.c
@@ -2322,17 +2322,61 @@ void test_sse_comi(double a1, double b1)
            r.l[0]);\
 }
 
-struct fpxstate {
+struct fnstate {
     uint16_t fpuc;
+    uint16_t dummy0;
     uint16_t fpus;
+    uint16_t dummy1;
     uint16_t fptag;
-    uint16_t fop;
+    uint16_t dummy2;
     uint32_t fpuip;
     uint16_t cs_sel;
-    uint16_t dummy0;
+    uint16_t fop;
     uint32_t fpudp;
     uint16_t ds_sel;
-    uint16_t dummy1;
+};
+
+static struct fnstate fn_state __attribute__((aligned(16)));
+float tmp_mem_operand;
+
+void test_fnstenv(void)
+{
+    struct fnstate *fp = &fn_state;
+
+    asm(" fld1\n"
+        " fmul tmp_mem_operand\n"
+        " fnstenv %0\n"
+        : "=m" (*(uint32_t *)fp) : );
+    printf("fpuc=%04x\n", fp->fpuc);
+    printf("fpus=%04x\n", fp->fpus);
+    printf("fptag=%04x\n", fp->fptag);
+    printf("fpuip=%04x\n", fp->fpuip);
+    printf("cs_sel=%04x\n", fp->cs_sel);
+    printf("fpudp=%04x\n", fp->fpudp);
+    printf("ds_sel=%04x\n", fp->ds_sel);
+}
+
+struct fpxstate {
+    uint16_t fpuc;
+    uint16_t fpus;
+    uint16_t fptag;
+    uint16_t fop;
+    union {
+        struct {
+            uint32_t fpuip;
+            uint16_t cs_sel;
+            uint16_t dummy0;
+        } mode_non_64_ins;
+        uint64_t mode_64_fpuip;
+    };
+    union {
+        struct {
+            uint32_t fpudp;
+            uint16_t ds_sel;
+            uint16_t dummy1;
+        } mode_non_64_data;
+        uint64_t mode_64_fpudp;
+    };
     uint32_t mxcsr;
     uint32_t mxcsr_mask;
     uint8_t fpregs1[8 * 16];
@@ -2362,6 +2406,7 @@ void test_fxsave(void)
         " fld1\n"
         " fldpi\n"
         " fldln2\n"
+        " fmul tmp_mem_operand\n"
         " fxsave %0\n"
         " fxrstor %0\n"
         " fxsave %1\n"
@@ -2371,6 +2416,18 @@ void test_fxsave(void)
     printf("fpuc=%04x\n", fp->fpuc);
     printf("fpus=%04x\n", fp->fpus);
     printf("fptag=%04x\n", fp->fptag);
+#if defined(__x86_64__)
+    printf("fpuip=%04llx\n", (long long unsigned int) fp->mode_64_fpuip);
+#else
+    printf("fpuip=%04x\n", fp->mode_non_64_ins.fpuip);
+    printf("cs_sel=%04x\n", fp->mode_non_64_ins.cs_sel);
+#endif
+#if defined(__x86_64__)
+    printf("fpudp=%04llx\n", (long long unsigned int) fp->mode_64_fpudp);
+#else
+    printf("fpudp=%04x\n", fp->mode_non_64_data.fpudp);
+    printf("ds_sel=%04x\n", fp->mode_non_64_data.ds_sel);
+#endif
     for(i = 0; i < 3; i++) {
         printf("ST%d: " FMT64X " %04x\n",
                i,
@@ -2757,6 +2814,7 @@ int main(int argc, char **argv)
 #endif
     test_enter();
     test_conv();
+    test_fnstenv();
 #ifdef TEST_SSE
     test_sse();
     test_fxsave();