support floating point environment (fenv) on armhf (hard float) subarchs

patch by nsz. I've tested it on an armhf machine and it seems to be
working correctly.

diff --git a/arch/arm/bits/fenv.h b/arch/arm/bits/fenv.h
index edbdea2a5efcda22054568550ef555acdf14cd35..1d990221d60fcd4a75db8282bf7446b6471c6221 100644 (file)
--- a/arch/arm/bits/fenv.h
+++ b/arch/arm/bits/fenv.h
@@ -1,5 +1,18 @@
+#ifdef __SOFTFP__
 #define FE_ALL_EXCEPT 0
 #define FE_TONEAREST  0
+#else
+#define FE_INVALID    1
+#define FE_DIVBYZERO  2
+#define FE_OVERFLOW   4
+#define FE_UNDERFLOW  8
+#define FE_INEXACT    16
+#define FE_ALL_EXCEPT 31
+#define FE_TONEAREST  0
+#define FE_DOWNWARD   0x800000
+#define FE_UPWARD     0x400000
+#define FE_TOWARDZERO 0xc00000
+#endif
 
 typedef unsigned long fexcept_t;
 

diff --git a/src/fenv/armebhf/fenv.sub b/src/fenv/armebhf/fenv.sub
new file mode 100644 (file)
index 0000000..5281e40
--- /dev/null
+++ b/src/fenv/armebhf/fenv.sub
@@ -0,0 +1 @@
+../armhf/fenv.s

diff --git a/src/fenv/armhf/fenv.s b/src/fenv/armhf/fenv.s
new file mode 100644 (file)
index 0000000..ee81b3d
--- /dev/null
+++ b/src/fenv/armhf/fenv.s
@@ -0,0 +1,60 @@
+.global fegetround
+.type fegetround,%function
+fegetround:
+       mrc p10, 7, r0, cr1, cr0, 0
+       and r0, r0, #0xc00000
+       bx lr
+
+.global fesetround
+.type fesetround,%function
+fesetround:
+       mrc p10, 7, r3, cr1, cr0, 0
+       bic r3, r3, #0xc00000
+       orr r3, r3, r0
+       mcr p10, 7, r3, cr1, cr0, 0
+       mov r0, #0
+       bx lr
+
+.global fetestexcept
+.type fetestexcept,%function
+fetestexcept:
+       mrc p10, 7, r3, cr1, cr0, 0
+       and r0, r0, r3
+       bx lr
+
+.global feclearexcept
+.type feclearexcept,%function
+feclearexcept:
+       mrc p10, 7, r3, cr1, cr0, 0
+       bic r3, r3, r0
+       mcr p10, 7, r3, cr1, cr0, 0
+       mov r0, #0
+       bx lr
+
+.global feraiseexcept
+.type feraiseexcept,%function
+feraiseexcept:
+       mrc p10, 7, r3, cr1, cr0, 0
+       orr r3, r3, r0
+       mcr p10, 7, r3, cr1, cr0, 0
+       mov r0, #0
+       bx lr
+
+.global fegetenv
+.type fegetenv,%function
+fegetenv:
+       mrc p10, 7, r3, cr1, cr0, 0
+       str r3, [r0]
+       mov r0, #0
+       bx lr
+
+.global fesetenv
+.type fesetenv,%function
+fesetenv:
+       mrc p10, 7, r3, cr1, cr0, 0
+       cmn r0, #1
+       moveq r3, #0
+       ldrne r3, [r0]
+       mcr p10, 7, r3, cr1, cr0, 0
+       mov r0, #0
+       bx lr

diff --git a/src/fenv/armhf/fenv.sub b/src/fenv/armhf/fenv.sub
new file mode 100644 (file)
index 0000000..ec559cd
--- /dev/null
+++ b/src/fenv/armhf/fenv.sub
@@ -0,0 +1 @@
+fenv.s