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[Qemu-devel] [PATCH 2/2] target-arm: Add "anyvfp" CPU
From: |
meadori |
Subject: |
[Qemu-devel] [PATCH 2/2] target-arm: Add "anyvfp" CPU |
Date: |
Mon, 6 Jul 2015 11:53:52 -0700 |
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