diff options
| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2013-03-25 18:09:02 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-05-09 17:55:18 +0200 |
| commit | 102cedc32a6e3cd537374a3678d407591d5a6fab (patch) | |
| tree | 7a91493a82e65c0da845afb12020e1534d83ee5d /arch/mips/kernel | |
| parent | MIPS: microMIPS: Fix macro naming in micro-assembler. (diff) | |
| download | linux-102cedc32a6e3cd537374a3678d407591d5a6fab.tar.xz linux-102cedc32a6e3cd537374a3678d407591d5a6fab.zip | |
MIPS: microMIPS: Floating point support.
Add logic needed to do floating point emulation in microMIPS mode.
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Steven J. Hill <Steven. Hill@imgtec.com>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/traps.c | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/unaligned.c | 22 |
2 files changed, 19 insertions, 5 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 4b6b607b0179..333782b83164 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -675,7 +675,7 @@ asmlinkage void do_ov(struct pt_regs *regs) force_sig_info(SIGFPE, &info, current); } -static int process_fpemu_return(int sig, void __user *fault_addr) +int process_fpemu_return(int sig, void __user *fault_addr) { if (sig == SIGSEGV || sig == SIGBUS) { struct siginfo si = {0}; diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c index 6087a54c86a0..f4c94ff3e3d3 100644 --- a/arch/mips/kernel/unaligned.c +++ b/arch/mips/kernel/unaligned.c @@ -83,6 +83,8 @@ #include <asm/branch.h> #include <asm/byteorder.h> #include <asm/cop2.h> +#include <asm/fpu.h> +#include <asm/fpu_emulator.h> #include <asm/inst.h> #include <asm/uaccess.h> @@ -108,6 +110,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, union mips_instruction insn; unsigned long value; unsigned int res; + void __user *fault_addr = NULL; perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); @@ -447,10 +450,21 @@ static void emulate_load_store_insn(struct pt_regs *regs, case ldc1_op: case swc1_op: case sdc1_op: - /* - * I herewith declare: this does not happen. So send SIGBUS. - */ - goto sigbus; + die_if_kernel("Unaligned FP access in kernel code", regs); + BUG_ON(!used_math()); + BUG_ON(!is_fpu_owner()); + + lose_fpu(1); /* Save FPU state for the emulator. */ + res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, + &fault_addr); + own_fpu(1); /* Restore FPU state. */ + + /* Signal if something went wrong. */ + process_fpemu_return(res, fault_addr); + + if (res == 0) + break; + return; /* * COP2 is available to implementor for application specific use. |