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commit c95b3011018893fcc473279768a67a24a73bbef2
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Author: Wilco <wdijkstr@arm.com>
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Date: Mon Jun 2 12:20:17 2014 +0100
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[AArch64] Rewrite feupdateenv (BZ 17009).
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diff --git a/ports/sysdeps/aarch64/fpu/feupdateenv.c b/ports/sysdeps/aarch64/fpu/feupdateenv.c
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index 6d64a9b..ac2f6fe 100644
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--- a/ports/sysdeps/aarch64/fpu/feupdateenv.c
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+++ b/ports/sysdeps/aarch64/fpu/feupdateenv.c
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@@ -22,16 +22,65 @@
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int
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feupdateenv (const fenv_t *envp)
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{
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+ fpu_control_t fpcr;
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+ fpu_control_t fpcr_new;
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+ fpu_control_t updated_fpcr;
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fpu_fpsr_t fpsr;
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+ fpu_fpsr_t fpsr_new;
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+ int excepts;
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- /* Get the current exception state. */
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+ _FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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+ excepts = fpsr & FE_ALL_EXCEPT;
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- /* Install new environment. */
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- fesetenv (envp);
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+ if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
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+ {
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+ fpcr_new = envp->__fpcr;
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+ fpsr_new = envp->__fpsr | excepts;
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- /* Raise the saved exceptions. */
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- feraiseexcept (fpsr & FE_ALL_EXCEPT);
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+ if (fpcr != fpcr_new)
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+ _FPU_SETCW (fpcr_new);
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+
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+ if (fpsr != fpsr_new)
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+ _FPU_SETFPSR (fpsr_new);
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+
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+ if (excepts & (fpcr_new >> FE_EXCEPT_SHIFT))
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+ return feraiseexcept (excepts);
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+
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+ return 0;
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+ }
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+
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+ fpcr_new = fpcr & _FPU_RESERVED;
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+ fpsr_new = fpsr & (_FPU_FPSR_RESERVED | FE_ALL_EXCEPT);
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+
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+ if (envp == FE_DFL_ENV)
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+ {
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+ fpcr_new |= _FPU_DEFAULT;
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+ fpsr_new |= _FPU_FPSR_DEFAULT;
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+ }
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+ else
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+ {
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+ fpcr_new |= _FPU_FPCR_IEEE;
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+ fpsr_new |= _FPU_FPSR_IEEE;
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+ }
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+
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+ _FPU_SETFPSR (fpsr_new);
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+
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+ if (fpcr != fpcr_new)
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+ {
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+ _FPU_SETCW (fpcr_new);
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+
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+ /* Trapping exceptions are optional in AArch64; the relevant enable
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+ bits in FPCR are RES0 hence the absence of support can be detected
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+ by reading back the FPCR and comparing with the required value. */
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+ _FPU_GETCW (updated_fpcr);
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+
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+ if (fpcr_new & ~updated_fpcr)
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+ return 1;
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+ }
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+
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+ if (excepts & (fpcr_new >> FE_EXCEPT_SHIFT))
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+ return feraiseexcept (excepts);
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return 0;
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}
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