Commit 6e1715f7 authored Jan 22, 2016 by Maciej W. Rozycki Committed by Ralf Baechle Jan 24, 2016

MIPS: math-emu: dsemul: Correct description of the emulation frame



Remove irrelevant content from the description of the emulation frame in
`mips_dsemul', referring to bare-metal configurations.  Update the text,
reflecting the change made with commit ba3049ed ("MIPS: Switch FPU
emulator trap to BREAK instruction."), where we switched from using an
address error exception on an unaligned access to the use of a BREAK 514
instruction causing a breakpoint exception instead.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12176/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 69a1e6cb

arch/mips/math-emu/dsemul.c

+2 −7

Original line number	Diff line number	Diff line
		@@ -78,13 +78,8 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
		* Algorithmics used a system call instruction, and
		* borrowed that vector. MIPS/Linux version is a bit
		* more heavyweight in the interests of portability and
		* multiprocessor support. For Linux we generate a
		* an unaligned access and force an address error exception.
		*
		* For embedded systems (stand-alone) we prefer to use a
		* non-existing CP1 instruction. This prevents us from emulating
		* branches, but gives us a cleaner interface to the exception
		* handler (single entry point).
		* multiprocessor support. For Linux we use a BREAK 514
		* instruction causing a breakpoint exception.
		*/
		break_math = BREAK_MATH(get_isa16_mode(regs->cp0_epc));