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| -rw-r--r-- | NEWS | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/NEWS b/NEWS index a2f93a18e3..0e3301ec92 100644 --- a/NEWS +++ b/NEWS @@ -53,6 +53,26 @@ Version 2.21 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building with newer versions of bison. + +* Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions. + The original MIPS o32 hard-float ABI requires an FPU where double-precision + registers overlay two consecutive single-precision registers. MIPS32R2 + introduced a new FPU mode (FR=1) where double-precision registers extend the + corresponding single-precision registers which is incompatible with the + o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both + require the use of FR=1 making a transition necessary. New o32 ABI + extensions enable users to migrate over time from the original o32 ABI + through to the updated o32 FP64 ABI. To achieve this the dynamic linker now + tracks the ABI of any loaded object and verifies that new objects are + compatible. Mode transitions will also be requested as required and + unsupportable objects will be rejected. The ABI checks include both soft and + hard float ABIs for o32, n32 and n64. + + GCC 5 with GNU binutils 2.25 onwards: + It is strongly recommended that all o32 system libraries are built using the + new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible + with the original and all new o32 ABI extensions. Configure a MIPS GCC + compiler using --with-fp-32=xx to set this by default. Version 2.20 |