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00335af674
restore_user_regs() restores the PPC FPSCR with a direct assignment:
env->fpscr = (uint32_t) fpscr;
ppc_store_fpscr() exists precisely to write FPSCR and keep the derived
env->fp_status in sync: it calls fpscr_set_rounding_mode() to update
the softfloat rounding mode, and set_float_rebias_overflow/underflow()
to reflect the FP_OE/FP_UE enable bits. The direct assignment bypasses
all of this.
On sigreturn, interrupted code resumes with whatever rounding mode and
overflow/underflow-rebias state the signal handler last installed in
fp_status, rather than the state that was saved at signal delivery.
Replace the direct assign with ppc_store_fpscr(). The FPSCR_MTFS_MASK
applied inside ppc_store_fpscr() only excludes the computed FP_FEX and
FP_VX bits, which it re-derives correctly from the exception and enable
bits in the restored value.
Fixes: bcd4933a23 ("linux-user: ppc signal handling")
Cc: qemu-stable@nongnu.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
(cherry picked from commit 3f50dd4666)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>