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Christophe Leroy b3484a1d4d powerpc/signal: Create 'unsafe' versions of copy_[ck][fpr/vsx]_to_user() 
For the non VSX version, that's trivial. Just use unsafe_copy_to_user()
instead of __copy_to_user().

For the VSX version, remove the intermediate step through a buffer and
use unsafe_put_user() directly. This generates a far smaller code which
is acceptable to inline, see below:

Standard VSX version:

0000000000000000 <.copy_fpr_to_user>:
   0:	7c 08 02 a6 	mflr    r0
   4:	fb e1 ff f8 	std     r31,-8(r1)
   8:	39 00 00 20 	li      r8,32
   c:	39 24 0b 80 	addi    r9,r4,2944
  10:	7d 09 03 a6 	mtctr   r8
  14:	f8 01 00 10 	std     r0,16(r1)
  18:	f8 21 fe 71 	stdu    r1,-400(r1)
  1c:	39 41 00 68 	addi    r10,r1,104
  20:	e9 09 00 00 	ld      r8,0(r9)
  24:	39 4a 00 08 	addi    r10,r10,8
  28:	39 29 00 10 	addi    r9,r9,16
  2c:	f9 0a 00 00 	std     r8,0(r10)
  30:	42 00 ff f0 	bdnz    20 <.copy_fpr_to_user+0x20>
  34:	e9 24 0d 80 	ld      r9,3456(r4)
  38:	3d 42 00 00 	addis   r10,r2,0
			3a: R_PPC64_TOC16_HA	.toc
  3c:	eb ea 00 00 	ld      r31,0(r10)
			3e: R_PPC64_TOC16_LO_DS	.toc
  40:	f9 21 01 70 	std     r9,368(r1)
  44:	e9 3f 00 00 	ld      r9,0(r31)
  48:	81 29 00 20 	lwz     r9,32(r9)
  4c:	2f 89 00 00 	cmpwi   cr7,r9,0
  50:	40 9c 00 18 	bge     cr7,68 <.copy_fpr_to_user+0x68>
  54:	4c 00 01 2c 	isync
  58:	3d 20 40 00 	lis     r9,16384
  5c:	79 29 07 c6 	rldicr  r9,r9,32,31
  60:	7d 3d 03 a6 	mtspr   29,r9
  64:	4c 00 01 2c 	isync
  68:	38 a0 01 08 	li      r5,264
  6c:	38 81 00 70 	addi    r4,r1,112
  70:	48 00 00 01 	bl      70 <.copy_fpr_to_user+0x70>
			70: R_PPC64_REL24	.__copy_tofrom_user
  74:	60 00 00 00 	nop
  78:	e9 3f 00 00 	ld      r9,0(r31)
  7c:	81 29 00 20 	lwz     r9,32(r9)
  80:	2f 89 00 00 	cmpwi   cr7,r9,0
  84:	40 9c 00 18 	bge     cr7,9c <.copy_fpr_to_user+0x9c>
  88:	4c 00 01 2c 	isync
  8c:	39 20 ff ff 	li      r9,-1
  90:	79 29 00 44 	rldicr  r9,r9,0,1
  94:	7d 3d 03 a6 	mtspr   29,r9
  98:	4c 00 01 2c 	isync
  9c:	38 21 01 90 	addi    r1,r1,400
  a0:	e8 01 00 10 	ld      r0,16(r1)
  a4:	eb e1 ff f8 	ld      r31,-8(r1)
  a8:	7c 08 03 a6 	mtlr    r0
  ac:	4e 80 00 20 	blr

'unsafe' simulated VSX version (The ... are only nops) using
unsafe_copy_fpr_to_user() macro:

unsigned long copy_fpr_to_user(void __user *to,
			       struct task_struct *task)
{
	unsafe_copy_fpr_to_user(to, task, failed);
	return 0;
failed:
	return 1;
}

0000000000000000 <.copy_fpr_to_user>:
   0:	39 00 00 20 	li      r8,32
   4:	39 44 0b 80 	addi    r10,r4,2944
   8:	7d 09 03 a6 	mtctr   r8
   c:	7c 69 1b 78 	mr      r9,r3
...
  20:	e9 0a 00 00 	ld      r8,0(r10)
  24:	f9 09 00 00 	std     r8,0(r9)
  28:	39 4a 00 10 	addi    r10,r10,16
  2c:	39 29 00 08 	addi    r9,r9,8
  30:	42 00 ff f0 	bdnz    20 <.copy_fpr_to_user+0x20>
  34:	e9 24 0d 80 	ld      r9,3456(r4)
  38:	f9 23 01 00 	std     r9,256(r3)
  3c:	38 60 00 00 	li      r3,0
  40:	4e 80 00 20 	blr
...
  50:	38 60 00 01 	li      r3,1
  54:	4e 80 00 20 	blr

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/29f6c4b8e7a5bbc61e6a8801b78bbf493f9f819e.1597770847.git.christophe.leroy@csgroup.eu
2020-12-04 01:01:14 +11:00
..
ptrace powerpc/signal: Don't manage floating point regs when no FPU 2020-12-04 01:01:11 +11:00
syscalls mm/madvise: introduce process_madvise() syscall: an external memory hinting API 2020-10-18 09:27:10 -07:00
trace powerpc: Add a ppc_inst_as_str() helper 2020-07-23 17:41:36 +10:00
vdso32 powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32 2020-12-04 01:01:11 +11:00
vdso64 powerpc/vdso: Switch VDSO to generic C implementation. 2020-12-04 01:01:10 +11:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
align.c powerpc: Use fallthrough pseudo-keyword 2020-07-29 21:09:37 +10:00
asm-offsets.c powerpc/signal: Don't manage floating point regs when no FPU 2020-12-04 01:01:11 +11:00
audit.c
btext.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheinfo.c powerpc/cacheinfo: Warn if cache object chain becomes unordered 2020-07-30 22:53:48 +10:00
cacheinfo.h
compat_audit.c
cpu_setup_6xx.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
cpu_setup_44x.S
cpu_setup_fsl_booke.S
cpu_setup_pa6t.S
cpu_setup_power.c powerpc/64s: Convert some cpu_setup() and cpu_restore() functions to C 2020-11-19 14:49:56 +11:00
cpu_setup_ppc970.S
cputable.c powerpc/64s: Convert some cpu_setup() and cpu_restore() functions to C 2020-11-19 14:49:56 +11:00
crash_dump.c powerpc: Add prefixed instructions to instruction data type 2020-05-19 00:10:39 +10:00
dawr.c powerpc/watchpoint: Guest support for 2nd DAWR hcall 2020-07-26 23:34:19 +10:00
dbell.c powerpc: Inline doorbell sending functions 2020-07-29 21:02:09 +10:00
dma-iommu.c dma-mapping: add a new dma_alloc_pages API 2020-09-25 06:20:47 +02:00
dma-mask.c
dma-swiotlb.c
dt_cpu_ftrs.c powerpc: untangle cputable mce include 2020-10-06 23:22:22 +11:00
early_32.c
eeh.c powerpc/eeh: Fix eeh_dev_check_failure() for PE#0 2020-10-22 10:38:53 +11:00
eeh_cache.c powerpc/eeh_cache: Fix a possible debugfs deadlock 2020-11-02 12:54:20 +11:00
eeh_driver.c pci-v5.9-changes 2020-08-07 18:48:15 -07:00
eeh_event.c
eeh_pe.c powerpc/eeh: Delete eeh_pe->config_addr 2020-10-07 22:34:47 +11:00
eeh_sysfs.c powerpc/eeh: Pass eeh_dev to eeh_ops->resume_notify() 2020-07-26 23:34:20 +10:00
entry_32.S powerpc: Remove RFI macro 2020-11-19 16:56:55 +11:00
entry_64.S powerpc/security: Fix link stack flush instruction 2020-10-08 12:50:52 +11:00
epapr_hcalls.S
epapr_paravirt.c powerpc: Use a datatype for instructions 2020-05-19 00:10:37 +10:00
exceptions-64e.S powerpc/64e: remove 64s specific interrupt soft-mask code 2020-10-06 23:22:23 +11:00
exceptions-64s.S powerpc fixes for CVE-2020-4788 2020-11-23 21:16:27 +11:00
fadump.c powerpc updates for 5.10 2020-10-16 12:21:15 -07:00
firmware.c powerpc/pseries: Add KVM guest doorbell restrictions 2020-07-29 21:02:10 +10:00
fpu.S powerpc: Drop SYNC_601() ISYNC_601() and SYNC() 2020-10-08 21:17:13 +11:00
fsl_booke_entry_mapping.S
head_8xx.S powerpc/8xx: Manage _PAGE_ACCESSED through APG bits in L1 entry 2020-11-05 23:34:25 +11:00
head_32.h powerpc: Remove RFI macro 2020-11-19 16:56:55 +11:00
head_40x.S powerpc/40x: Always fault when _PAGE_ACCESSED is not set 2020-11-05 23:34:16 +11:00
head_44x.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
head_64.S powerpc/64s: Replace RFI by RFI_TO_KERNEL and remove RFI 2020-11-19 16:56:54 +11:00
head_book3s_32.S powerpc/32s: Allow deselecting CONFIG_PPC_FPU on mpc832x 2020-12-04 01:01:12 +11:00
head_booke.h powerpc: Replace RFI by rfi on book3s/32 and booke 2020-11-19 16:56:54 +11:00
head_fsl_booke.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
hw_breakpoint.c powerpc/watchpoint: Move DAWR detection logic outside of hw_breakpoint.c 2020-09-15 22:13:19 +10:00
hw_breakpoint_constraints.c powerpc/watchpoint: Move DAWR detection logic outside of hw_breakpoint.c 2020-09-15 22:13:19 +10:00
idle.c powerpc: Move arch_cpu_idle_dead() into smp.c 2020-09-18 19:59:43 +10:00
idle_6xx.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
idle_book3e.S
idle_book3s.S
idle_e500.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
ima_arch.c powerpc/ima: Fix secure boot rules in ima arch policy 2020-05-07 17:25:54 +10:00
io-workarounds.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
io.c
iomap.c powerpc: inline iomap accessors 2020-12-04 01:01:09 +11:00
iommu.c dma-mapping: introduce dma_get_seg_boundary_nr_pages() 2020-09-03 18:12:15 +02:00
irq.c powerpc: Remove get_tb_or_rtc() 2020-10-08 21:17:14 +11:00
isa-bridge.c powerpc: remove __ioremap_at and __iounmap_at 2020-06-02 10:59:10 -07:00
jump_label.c powerpc: Use a datatype for instructions 2020-05-19 00:10:37 +10:00
kgdb.c maccess: make get_kernel_nofault() check for minimal type compatibility 2020-06-18 12:10:37 -07:00
kprobes-ftrace.c
kprobes.c powerpc: kprobes: Use generic kretprobe trampoline handler 2020-09-08 11:52:34 +02:00
kvm.c
kvm_emul.S
l2cr_6xx.S powerpc: Drop SYNC_601() ISYNC_601() and SYNC() 2020-10-08 21:17:13 +11:00
legacy_serial.c
Makefile powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
mce.c powerpc/mce: Avoid nmi_enter/exit in real mode on pseries hash 2020-10-16 20:13:55 +11:00
mce_power.c powerpc/powernv: Machine check handler for POWER10 2020-07-23 17:43:30 +10:00
misc.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
misc_32.S powerpc: Rewrite FSL_BOOKE flush_cache_instruction() in C 2020-09-02 11:00:21 +10:00
misc_64.S powerpc: Remove SYNC on non 6xx 2020-10-08 21:17:12 +11:00
module.c powerpc: Use MODULES_VADDR if defined 2020-07-27 00:01:30 +10:00
module_32.c powerpc: module_[32|64].c: replace swap function with built-in one 2020-05-11 23:15:14 +10:00
module_64.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
msi.c
note.S
nvram_64.c powerpc updates for 5.8 2020-06-05 12:39:30 -07:00
of_platform.c powerpc/eeh: Remove eeh_dev_phb_init_dynamic() 2020-07-26 23:34:19 +10:00
optprobes.c powerpc: Add ppc_inst_as_u64() 2020-05-26 23:36:57 +10:00
optprobes_head.S powerpc: Add prefixed instructions to instruction data type 2020-05-19 00:10:39 +10:00
paca.c powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
pci-common.c Revert "powerpc/pci: unmap legacy INTx interrupts when a PHB is removed" 2020-10-15 13:42:49 +11:00
pci-hotplug.c powerpc/eeh: Release EEH device state synchronously 2020-05-18 21:58:44 +10:00
pci_32.c
pci_64.c powerpc updates for 5.8 2020-06-05 12:39:30 -07:00
pci_dn.c powerpc/eeh: Rename eeh_{add_to|remove_from}_parent_pe() 2020-07-26 23:34:21 +10:00
pci_of_scan.c
pmc.c
ppc32.h
ppc_save_regs.S powerpc: Improve ppc_save_regs() 2020-04-04 21:40:57 +11:00
proc_powerpc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
process.c powerpc/signal: Don't manage floating point regs when no FPU 2020-12-04 01:01:11 +11:00
prom.c powerpc/mm/book3s: Split radix and hash MAX_PHYSMEM limit 2020-09-15 22:13:22 +10:00
prom_init.c treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
prom_init_check.sh
prom_parse.c
reloc_32.S
reloc_64.S
rtas-proc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas-rtc.c
rtas.c powerpc/rtas: Restrict RTAS requests from userspace 2020-10-06 23:22:27 +11:00
rtas_flash.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas_pci.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
rtasd.c powerpc/rtasd: simplify handle_rtas_event(), emit message on events 2020-07-16 13:12:38 +10:00
secure_boot.c powerpc/pseries: Detect secure and trusted boot state of the system. 2020-07-16 14:49:53 +10:00
security.c powerpc/security: Fix link stack flush instruction 2020-10-08 12:50:52 +11:00
secvar-ops.c
secvar-sysfs.c
setup-common.c powerpc/64: Set up a kernel stack for secondaries before cpu_restore() 2020-11-02 12:54:38 +11:00
setup.h powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
setup_32.c powerpc: Remove support for PowerPC 601 2020-10-08 21:17:13 +11:00
setup_64.c Merge branch 'fixes' into next 2020-11-25 23:17:31 +11:00
signal.c powerpc/signal: Refactor bad frame logging 2020-12-04 01:01:12 +11:00
signal.h powerpc/signal: Create 'unsafe' versions of copy_[ck][fpr/vsx]_to_user() 2020-12-04 01:01:14 +11:00
signal_32.c powerpc/signal32: Switch swap_context() to user_access_begin() logic 2020-12-04 01:01:14 +11:00
signal_64.c powerpc/signal: Refactor bad frame logging 2020-12-04 01:01:12 +11:00
smp-tbsync.c
smp.c powerpc/smp: Call rcu_cpu_starting() earlier 2020-11-02 12:54:20 +11:00
stacktrace.c kernel: rename show_stack_loglvl() => show_stack() 2020-06-09 09:39:13 -07:00
suspend.c
swsusp.c
swsusp_32.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
swsusp_64.c
swsusp_asm64.S
swsusp_booke.S
sys_ppc32.c
syscall_64.c powerpc: Only include kup-radix.h for 64-bit Book3S 2020-11-19 23:47:20 +11:00
syscalls.c
sysfs.c powerpc/sysfs: Remove unused 'err' variable in sysfs_create_dscr_default() 2020-09-18 20:05:24 +10:00
systbl.S powerpc/64/sycall: Implement syscall entry/exit logic in C 2020-04-01 13:42:13 +11:00
systbl_chk.sh
tau_6xx.c powerpc/tau: Disable TAU between measurements 2020-09-15 22:13:30 +10:00
time.c powerpc/vdso: Switch VDSO to generic C implementation. 2020-12-04 01:01:10 +11:00
tm.S powerpc/tm: Save and restore AMR on treclaim and trechkpt 2020-10-06 23:22:25 +11:00
traps.c powerpc/signal: Don't manage floating point regs when no FPU 2020-12-04 01:01:11 +11:00
ucall.S
udbg.c
udbg_16550.c
uprobes.c powerpc: Add ppc_inst_next() 2020-05-26 23:36:51 +10:00
vdso.c powerpc/vdso: Switch VDSO to generic C implementation. 2020-12-04 01:01:10 +11:00
vecemu.c powerpc: Define and use get_user_instr() et. al. 2020-05-19 00:10:37 +10:00
vector.S powerpc: re-initialise lazy FPU/VEC counters on every fault 2020-07-16 13:00:24 +10:00
vmlinux.lds.S Merge branch 'fixes' into next 2020-11-25 23:17:31 +11:00
watchdog.c