[Qemu-devel] [PATCH 2/2] target-arm: Add "anyvfp" CPU

[meadori]

From: Meador Inge <address@hidden>

This patch adds support for `-cpu anyvfp`, which is just
like `-cpu any`, but enables the coprocessors by default.
This is useful for working with a wide range of bare-metal
C/C++ applications that have been compiled in different
ways and assume the coprocessor has been enabled already.

Original patch by Daniel Jacobowitz.

Signed-off-by: Meador Inge <address@hidden>
---
 target-arm/cpu.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 3665f6b..2a00e73 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -181,7 +181,14 @@ static void arm_cpu_reset(CPUState *s)
         env->regs[15] = 0xFFFF0000;
     }
 
-    env->vfp.xregs[ARM_VFP_FPEXC] = 0;
+    /* For -cpu anyvfp, enable coprocessors by default.  Useful for
+       testing code that expects something else to turn on the
+       coprocessor.  */
+    if (cpu->midr == 0xfffffffe) {
+        env->vfp.xregs[ARM_VFP_FPEXC] = 1 << 30;
+    } else {
+        env->vfp.xregs[ARM_VFP_FPEXC] = 0;
+    }
 #endif
     set_flush_to_zero(1, &env->vfp.standard_fp_status);
     set_flush_inputs_to_zero(1, &env->vfp.standard_fp_status);
@@ -1258,6 +1265,13 @@ static void arm_any_initfn(Object *obj)
     cpu->midr = 0xffffffff;
 }
 
+static void arm_anyvfp_initfn(Object *obj)
+{
+    ARMCPU *cpu = ARM_CPU(obj);
+    arm_any_initfn(obj);
+    cpu->midr = 0xfffffffe;
+}
+
 #endif /* !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64) */
 
 typedef struct ARMCPUInfo {
@@ -1304,6 +1318,7 @@ static const ARMCPUInfo arm_cpus[] = {
     { .name = "pxa270-c0",   .initfn = pxa270c0_initfn },
     { .name = "pxa270-c5",   .initfn = pxa270c5_initfn },
     { .name = "any",         .initfn = arm_any_initfn },
+    { .name = "anyvfp",      .initfn = arm_anyvfp_initfn },
 #endif
     { .name = NULL }
 };
-- 
1.8.1.1