Patchwork [09/16] ARM: Expose vfp_get_fpscr() and vfp_set_fpscr() to C code

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Submitter Riku@afflict.kos.to, Voipio@afflict.kos.to
Date Dec. 3, 2010, 1:36 p.m.
Message ID <0165329578eb8f40901825177c0874efb815e342.1291382447.git.riku.voipio@nokia.com>
Download mbox | patch
Permalink /patch/74153/
State New
Headers show

Comments

From: Peter Maydell <peter.maydell@linaro.org>

Expose the vfp_get_fpscr() and vfp_set_fpscr() functions to C
code as well as generated code, so we can use them to read and
write the FPSCR when saving and restoring VFP registers across
signal handlers in linux-user mode.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
---
 target-arm/cpu.h    |    4 ++++
 target-arm/helper.c |   10 ++++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)

Patch

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 0284bad..340933e 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -300,6 +300,10 @@  static inline void xpsr_write(CPUARMState *env, uint32_t val, uint32_t mask)
     }
 }
 
+/* Return the current FPSCR value.  */
+uint32_t vfp_get_fpscr(CPUARMState *env);
+void vfp_set_fpscr(CPUARMState *env, uint32_t val);
+
 enum arm_cpu_mode {
   ARM_CPU_MODE_USR = 0x10,
   ARM_CPU_MODE_FIQ = 0x11,
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 94aef39..2a1f448 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2251,6 +2251,11 @@  uint32_t HELPER(vfp_get_fpscr)(CPUState *env)
     return fpscr;
 }
 
+uint32_t vfp_get_fpscr(CPUState *env)
+{
+    return HELPER(vfp_get_fpscr)(env);
+}
+
 /* Convert vfp exception flags to target form.  */
 static inline int vfp_exceptbits_to_host(int target_bits)
 {
@@ -2307,6 +2312,11 @@  void HELPER(vfp_set_fpscr)(CPUState *env, uint32_t val)
     set_float_exception_flags(i, &env->vfp.fp_status);
 }
 
+void vfp_set_fpscr(CPUState *env, uint32_t val)
+{
+    HELPER(vfp_set_fpscr)(env, val);
+}
+
 #define VFP_HELPER(name, p) HELPER(glue(glue(vfp_,name),p))
 
 #define VFP_BINOP(name) \