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9791554b45
linux/arch/mips/kernel
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Paul Burton 9791554b45 MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS 
Userland code may be built using an ABI which permits linking to objects
that have more restrictive floating point requirements. For example,
userland code may be built to target the O32 FPXX ABI. Such code may be
linked with other FPXX code, or code built for either one of the more
restrictive FP32 or FP64. When linking with more restrictive code, the
overall requirement of the process becomes that of the more restrictive
code. The kernel has no way to know in advance which mode the process
will need to be executed in, and indeed it may need to change during
execution. The dynamic loader is the only code which will know the
overall required mode, and so it needs to have a means to instruct the
kernel to switch the FP mode of the process.

This patch introduces 2 new options to the prctl syscall which provide
such a capability. The FP mode of the process is represented as a
simple bitmask combining a number of mode bits mirroring those present
in the hardware. Userland can either retrieve the current FP mode of
the process:

  mode = prctl(PR_GET_FP_MODE);

or modify the current FP mode of the process:

  err = prctl(PR_SET_FP_MODE, new_mode);

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8899/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-02-12 12:30:29 +01:00
..
.gitignore
8250-platform.c
asm-offsets.c MIPS: save/restore MSACSR register on context switch 2014-08-02 00:06:43 +02:00
binfmt_elfn32.c MIPS: Compat: Fix cputime_to_timeval() arguments in compat binfmt_elf. 2013-06-06 16:11:26 +02:00
binfmt_elfo32.c MIPS: Remove old core dump functions 2014-08-02 00:06:37 +02:00
bmips_vec.S MIPS: BMIPS: Fix ".previous without corresponding .section" warnings 2014-11-24 07:44:05 +01:00
branch.c MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
cevt-bcm1480.c MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 2013-07-14 19:36:51 -04:00
cevt-ds1287.c
cevt-gt641xx.c
cevt-r4k.c MIPS: cevt-r4k: Drop GIC special case 2015-02-05 14:56:53 +01:00
cevt-sb1250.c MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 2013-07-14 19:36:51 -04:00
cevt-txx9.c
cps-vec.S MIPS: kernel: cps-vec: Set ISA level to mips32r2 for the MIPS MT ASE 2014-11-24 07:44:06 +01:00
cpu-bugs64.c MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 2013-07-14 19:36:51 -04:00
cpu-probe.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-12-11 17:56:37 -08:00
crash_dump.c mips: Convert pr_warning to pr_warn 2014-11-24 07:44:51 +01:00
crash.c mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
csrc-bcm1480.c
csrc-ioasic.c MIPS: DECstation HRT initialization rearrangement 2013-09-13 11:56:13 +02:00
csrc-r4k.c
csrc-sb1250.c
early_printk_8250.c MIPS: Add 8250/16550 serial early printk driver 2013-10-29 21:24:36 +01:00
early_printk.c
elf.c MIPS: Kconfig option to better exercise/debug hybrid FPRs 2014-11-24 07:45:08 +01:00
entry.S MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
ftrace.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-08-07 08:47:00 -07:00
genex.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
gpio_txx9.c
head.S MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
i8253.c
i8259.c MIPS: i8259: Use IRQ domains 2014-11-24 07:44:52 +01:00
idle.c MIPS: idle: Remove leftover __pastwait symbol and its references 2014-10-23 19:24:05 +02:00
irq_cpu.c MIPS: Set vint handler when mapping CPU interrupts 2014-11-24 07:44:52 +01:00
irq_txx9.c
irq-gt641xx.c
irq-msc01.c MIPS: MSC: Prevent out-of-bounds writes to MIPS SC ioremap'd region 2014-06-26 10:48:23 +01:00
irq-rm7000.c
irq.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-06-09 18:10:34 -07:00
jump_label.c MIPS: jump_label.c: Handle the microMIPS J instruction encoding 2014-11-19 18:22:09 +01:00
kgdb.c MIPS: kernel: {ftrace,kgdb}: Set correct address limit for cache flushes 2014-03-26 23:09:18 +01:00
kprobes.c mips: Replace __get_cpu_var uses 2014-08-26 13:45:51 -04:00
linux32.c unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
machine_kexec.c MIPS: kdump: Set correct value to kexec_indirection_page variable 2014-08-25 16:33:44 +02:00
Makefile clocksource: mips-gic: Combine with GIC clockevent driver 2014-11-24 07:45:15 +01:00
mcount.S MIPS: mcount: Adjust stack pointer for static trace in MIPS32 2014-09-26 11:41:17 +02:00
mips_ksyms.c MIPS: Remove __strlen_user(). 2014-11-24 07:45:00 +01:00
mips_machine.c MIPS: move mips_{set,get}_machine_name() to a more generic place 2013-05-08 01:19:07 +02:00
mips-cm.c MIPS: Replace use of phys_t with phys_addr_t. 2014-11-24 22:47:31 +01:00
mips-cpc.c MIPS: Replace use of phys_t with phys_addr_t. 2014-11-24 22:47:31 +01:00
mips-mt-fpaff.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
mips-mt.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
module-rela.c
module.c MIPS: Use NUMA_NO_NODE instead of -1 for node ID. 2013-10-29 21:24:14 +01:00
octeon_switch.S MIPS: OCTEON: Enable use of FPU 2014-05-30 21:01:09 +02:00
perf_event_mipsxx.c MIPS: Add hook to get C0 performance counter interrupt 2014-11-24 07:44:53 +01:00
perf_event.c
pm-cps.c MIPS: {pm,smp}-cps: use cpu_vpe_id macro 2014-07-30 20:48:42 +02:00
pm.c MIPS: PM: Implement PM helper macros 2014-05-02 16:39:10 +01:00
proc.c MIPS: cpu: Add new cpu option for Hardware Table Walker. 2014-08-02 00:06:38 +02:00
process.c MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS 2015-02-12 12:30:29 +01:00
prom.c MIPS: Create a helper function for DT setup 2014-11-24 07:45:12 +01:00
ptrace32.c MIPS: Remove asm/user.h 2014-08-02 00:06:37 +02:00
ptrace.c Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
r4k_fpu.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
r4k_switch.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
r2300_fpu.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
r2300_switch.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
r6000_fpu.S MIPS: Fix build with binutils 2.24.51+ 2014-11-07 15:07:36 +01:00
relocate_kernel.S MIPS: kdump: Skip walking indirection page for crashkernels 2013-09-05 20:53:37 +02:00
reset.c
rtlx-cmp.c MIPS: APRP: Fix an issue when device_create() fails. 2014-08-01 17:30:35 +02:00
rtlx-mt.c MIPS: APRP: Fix an issue when device_create() fails. 2014-08-01 17:30:35 +02:00
rtlx.c MIPS: rtlx: Remove KERN_DEBUG from pr_debug() arguments in rtlx.c 2014-11-24 07:44:04 +01:00
scall32-o32.S MIPS: Wire up bpf syscall. 2014-10-27 03:37:42 +01:00
scall64-64.S MIPS: Wire up bpf syscall. 2014-10-27 03:37:42 +01:00
scall64-n32.S MIPS: Wire up bpf syscall. 2014-10-27 03:37:42 +01:00
scall64-o32.S MIPS: Wire up bpf syscall. 2014-10-27 03:37:42 +01:00
segment.c MIPS: Add debugfs file to print the segmentation control registers 2014-01-22 20:19:00 +01:00
setup.c MIPS: Use phys_addr_t instead of phys_t 2014-12-12 15:36:13 -08:00
signal32.c mips: Use sigsp() 2014-08-06 13:04:30 +02:00
signal_n32.c mips: Use sigsp() 2014-08-06 13:04:30 +02:00
signal-common.h mips: Use get_signal() signal_setup_done() 2014-08-06 13:03:08 +02:00
signal.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-12-11 17:56:37 -08:00
smp-bmips.c MIPS: BMIPS: Let each platform customize the CPU1 IRQ mask 2014-11-24 07:45:11 +01:00
smp-cmp.c MIPS: Move gic.h to include/linux/irqchip/mips-gic.h 2014-11-24 07:44:59 +01:00
smp-cps.c MIPS: Move gic.h to include/linux/irqchip/mips-gic.h 2014-11-24 07:44:59 +01:00
smp-gic.c MIPS: Move gic.h to include/linux/irqchip/mips-gic.h 2014-11-24 07:44:59 +01:00
smp-mt.c MIPS: Move gic.h to include/linux/irqchip/mips-gic.h 2014-11-24 07:44:59 +01:00
smp-up.c MIPS: SMP: Remove plat_smp_ops cpus_done method. 2014-05-27 11:06:42 +02:00
smp.c MIPS: Support CPU topology files in sysfs 2014-07-30 21:45:39 +02:00
spinlock_test.c
spram.c MIPS: Use current_cpu_type() instead of c->cputype 2014-03-31 18:17:12 +02:00
stacktrace.c
sync-r4k.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
syscall.c MIPS: Apply `.insn' to fixup labels throughout 2014-11-24 07:45:36 +01:00
time.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
topology.c
traps.c MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS 2015-02-12 12:30:29 +01:00
unaligned.c MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade() 2014-07-30 21:30:22 +02:00
vdso.c MIPS: Enable VDSO randomization 2014-11-24 07:45:38 +01:00
vmlinux.lds.S MIPS: Discard .eh_frame sections in linker script. 2013-08-26 15:33:41 +02:00
vpe-cmp.c MIPS: APRP: Add VPE loader support for CMP platforms. 2014-01-22 20:19:02 +01:00
vpe-mt.c MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
vpe.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-01-30 17:20:32 -08:00
watch.c MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 2013-07-14 19:36:51 -04:00