Al Viro 37d1b326c9 alpha: fix FEN fault handling ... commit 977a300954 upstream. Type 3 instruction fault (FPU insn with FPU disabled) is handled by quietly enabling FPU and returning. Which is fine, except that we need to do that both for fault in userland and in the kernel; the latter *can* legitimately happen - all it takes is this: .global _start _start: call_pal 0xae lda $0, 0 ldq $0, 0($0) - call_pal CLRFEN to clear "FPU enabled" flag and arrange for a signal delivery (SIGSEGV in this case). Fixed by moving the handling of type 3 into the common part of do_entIF(), before we check for kernel vs. user mode. Incidentally, the check for kernel mode is unidiomatic; the normal way to do that is !user_mode(regs). The difference is that the open-coded variant treats any of bits 63..3 of regs->ps being set as "it's user mode" while the normal approach is to check just the bit 3. PS is a 4-bit register and regs->ps always will have bits 63..4 clear, so the open-coded variant here is actually equivalent to !user_mode(regs). Harder to follow, though... Cc: stable@vger.kernel.org Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-03-10 09:34:25 +01:00
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boot	alpha/boot/tools/objstrip: fix the check for ELF header	2023-03-10 09:33:30 +01:00
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include	alpha: fix TIF_NOTIFY_SIGNAL handling	2022-12-31 13:31:55 +01:00
kernel	alpha: fix FEN fault handling	2023-03-10 09:34:25 +01:00
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