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Author SHA1 Message Date
Daniel Axtens
1fc0c27b14 powerpc/feature-fixups: use a semicolon rather than a comma 
In a bunch of our security flushes, we use a comma rather than
a semicolon to 'terminate' an assignment. Nothing breaks, but
checkpatch picks it up if you copy it into another flush.

Switch to semicolons for ending statements.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201201144344.1228421-1-dja@axtens.net
 2020-12-04 01:01:20 +11:00
Frederic Barrat
c8754c517e powerpc/pseries: Define PCI bus speed for Gen4 and Gen5 
Update bus speed definition for PCI Gen4 and 5.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201130152949.26467-1-fbarrat@linux.ibm.com
 2020-12-04 01:01:20 +11:00
Jordan Niethe
1baa1f70ef powerpc: Allow relative pointers in bug table entries 
This enables GENERIC_BUG_RELATIVE_POINTERS on Power so that 32-bit
offsets are stored in the bug entries rather than 64-bit pointers.
While this doesn't save space for 32-bit machines, use it anyway so
there is only one code path.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201201005203.15210-1-jniethe5@gmail.com
 2020-12-04 01:01:20 +11:00
Ravi Bangoria
f3e9040801 powerpc/xmon: Fix build failure for 8xx 
With CONFIG_PPC_8xx and CONFIG_XMON set, kernel build fails with

  arch/powerpc/xmon/xmon.c:1379:12: error: 'find_free_data_bpt' defined
  but not used [-Werror=unused-function]

Fix it by enclosing find_free_data_bpt() inside #ifndef CONFIG_PPC_8xx.

Fixes: 30df74d67d ("powerpc/watchpoint/xmon: Support 2nd DAWR")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201130034406.288047-1-ravi.bangoria@linux.ibm.com
 2020-12-04 01:01:20 +11:00
Youling Tang
a21df7a1d6 powerpc: Use common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macro 
Use the common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macro rule for
the linker script in an effort.

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1606460857-2723-1-git-send-email-tangyouling@loongson.cn
 2020-12-04 01:01:20 +11:00
Jordan Niethe
fe18a35e68 powerpc/64: Fix an EMIT_BUG_ENTRY in head_64.S 
Commit 63ce271b5e ("powerpc/prom: convert PROM_BUG() to standard
trap") added an EMIT_BUG_ENTRY for the trap after the branch to
start_kernel(). The EMIT_BUG_ENTRY was for the address "0b", however the
trap was not labeled with "0". Hence the address used for bug is in
relative_toc() where the previous "0" label is. Label the trap as "0" so
the correct address is used.

Fixes: 63ce271b5e ("powerpc/prom: convert PROM_BUG() to standard trap")
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201130004404.30953-1-jniethe5@gmail.com
 2020-12-04 01:01:20 +11:00
Christophe Leroy
65d2150c89 powerpc/vdso: Cleanup vdso.h 
Rename the guard define to _ASM_POWERPC_VDSO_H

And remove useless #ifdef __KERNEL__

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/9902590d410cd1c2afa48b83b277faf0711f07b2.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
676155ab23 powerpc/vdso: Remove VDSO32_LBASE and VDSO64_LBASE 
VDSO32_LBASE and VDSO64_LBASE are 0. Remove them to simplify code.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6c4d6570d886bbe1cc471e8ca01602e4b4d9beb5.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
e90903203d powerpc/vdso: Remove DBG() 
DBG() is not used anymore. Remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e11a9b50e709f197bb3aa2ed1d80d2dee8714afc.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
23c4ceaf1a powerpc/vdso: Remove vdso_ready 
There is no way to get out of vdso_init() prematuraly anymore.

Remove vdso_ready as it will always be 1.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0e1e18c6329b848aa3edeeba76509b4d76182e7d.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
a4ccd64acb powerpc/vdso: Remove vdso_setup() 
vdso_fixup_features() cannot fail anymore and that's
the only function called by vdso_setup().

vdso_setup() has become trivial and can be removed.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/11522eec6140f510a8c89c63cbb739277d097fdc.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
67a354051d powerpc/vdso: Remove lib32_elfinfo and lib64_elfinfo 
lib32_elfinfo and lib64_elfinfo are not used anymore, remove them.

Also remove vdso32_kbase and vdso64_kbase while removing the
last use.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/01ac65abf22f0428f8f764525a7d84459c54d806.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:19 +11:00
Christophe Leroy
6ed613ad57 powerpc/vdso: Remove symbol section information in struct lib32/64_elfinfo 
The members related to the symbol section in struct lib32_elfinfo and
struct lib64_elfinfo are not used anymore, removed them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b779e5b7cc0354e2f87fd407fe5b02f4a8a73825.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
e113f8ef1c powerpc/vdso: Remove unused text member in struct lib32/64_elfinfo 
The text member in struct lib32_elfinfo and struct lib64_elfinfo
is not used, remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f53dcc9bb1946a7854d15b34d03d3d2e2003848c.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
5cda7c7549 powerpc/vdso: Remove vdso_patches[] and associated functions 
vdso_patches[] is now empty, remove it and remove
all functions that depends on it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/27d75debd6e4ddeaffe1d66ffed1e7526684a004.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
899367ea50 powerpc/vdso: Remove runtime generated sigtramp offsets 
Signal trampoline offsets are now generated at buildtime.

Runtime generated offsets are not used anymore, remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7c192d35a437151837cf4c48aeccb42380d6daac.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
49bf59fd03 powerpc/vdso: Remove __kernel_datapage_offset 
__kernel_datapage_offset is not used anymore, remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ddb5c746bec4e1a026d7c85243213a1876ef844f.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
b7fe9c15b5 powerpc/vdso: Remove vdso32_pages and vdso64_pages 
vdso32_pages and vdso64_pages are not used anymore.

Remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bce021f616cbaf39dfb5766cf7ef114adcb918d9.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:18 +11:00
Christophe Leroy
0fc980db9a powerpc/vdso: Merge __kernel_sync_dicache_p5() into __kernel_sync_dicache() 
__kernel_sync_dicache_p5() is an alternative to
__kernel_sync_dicache() when cpu has CPU_FTR_COHERENT_ICACHE

Remove this alternative function and merge
__kernel_sync_dicache_p5() into __kernel_sync_dicache() using
standard CPU feature fixup.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4c7dcc6544882761b2b0249d7a8ec2c3a8088cb5.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
ed07f6353d powerpc/vdso: Use builtin symbols to locate fixup section 
Add builtin symbols to locate fixup section and use them
instead of locating sections through elf headers at runtime.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2954526981859ca1ccfcfc7a7c4263920e9ddfcb.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
91bf695596 powerpc/vdso: Retrieve sigtramp offsets at buildtime 
This is copied from arm64.

Instead of using runtime generated signal trampoline offsets,
get offsets at buildtime.

If the said trampoline doesn't exist, build will fail. So no
need to check whether the trampoline exists or not in the VDSO.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f8bfd6812c3e3678b1cdb4d55a52f9eb022b40d3.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
550e6074c1 powerpc/vdso: Remove unused \tmp param in __get_datapage() 
The \tmp param is not used anymore, remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4b13f897dcccce8ae03c031a4598cf26b32e2f1c.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
591857b635 powerpc/vdso: Simplify __get_datapage() 
The VDSO datapage and the text pages are always located immediately
next to each other, so it can be hardcoded without an indirection
through __kernel_datapage_offset

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b08f5ef99d64cfc38f79b7ad5310d9b4d2479eeb.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
511157ab64 powerpc/vdso: Move vdso datapage up front 
Move the vdso datapage in front of the VDSO area,
before vdso test.

This will allow to remove the __kernel_datapage_offset symbol
and simplify __get_datapage() in following patches.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b68c99b6e8ee0b1d99bfa4c7e34c359fc1bc1000.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:17 +11:00
Christophe Leroy
c102f07667 powerpc/vdso: Replace vdso_base by vdso 
All other architectures but s390 use a void pointer named 'vdso'
to reference the VDSO mapping.

In a following patch, the VDSO data page will be put in front of
text, vdso_base will then not anymore point to VDSO text.

To avoid confusion between vdso_base and VDSO text, rename vdso_base
into vdso and make it a void __user *.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8e6cefe474aa4ceba028abb729485cd46c140990.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
526a9c4a72 powerpc/vdso: Provide vdso_remap() 
Provide vdso_remap() through _install_special_mapping() and
drop arch_remap().

This adds a test of the size and returns -EINVAL if the size
is not correct.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/373c66f768fa9cc8890f3b55462209a98c522326.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
c1bab64360 powerpc/vdso: Move to _install_special_mapping() and remove arch_vma_name() 
Copied from commit 2fea7f6c98 ("arm64: vdso: move to
_install_special_mapping and remove arch_vma_name").

Use the new _install_special_mapping() API added by
commit a62c34bd2a ("x86, mm: Improve _install_special_mapping
and fix x86 vdso naming") which obsolete install_special_mapping().

And remove arch_vma_name() as the name is handled by the new API.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: kernel test robot <lkp@intel.com>
[mpe: Squash fix to use PTR_ERR_OR_ZERO() from lkp]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e7e5dfe0f93234e31051f2a610b4b07f50b0082f.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
b2df3f60b4 powerpc/vdso: Simplify arch_setup_additional_pages() exit 
To simplify arch_setup_additional_pages() exit, rename
it __arch_setup_additional_pages() and create a caller
arch_setup_additional_pages() which does the locking.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/603c1d039d3f928ee95e547fcd2219fcf4c3b514.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
7461a4f79b powerpc/vdso: Use VDSO size in arch_setup_additional_pages() 
In arch_setup_additional_pages(), instead of using number of VDSO
pages and recalculate VDSO size, directly use the VDSO size.

As vdso_ready is set, vdso_pages can't be 0 so just remove the test.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4edfa548c3885a430b765335dc720105716e273f.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
4fe0e3c172 powerpc/vdso: Remove unnecessary ifdefs in vdso_pagelist initialization 
No need of all those #ifdefs around the pagelist initialisation,
use IS_ENABLED(), GCC will kick out unused static variables.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f9333432e329b1fcbbbf846cb1cd4a1c4127a60b.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:16 +11:00
Christophe Leroy
3cf6382541 powerpc/vdso: Refactor 32 bits and 64 bits pages setup 
The setup of VDSO pages is identical for 32 bits VDSO and
64 bits VDSO.

Refactor that setup.

And use &vdsoXX_start which is synonym of vdsoXX_kbase.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/269ffb54c37fc1d46128f77d7a39f88ef4a9957d.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
35c1c7c0bc powerpc/vdso: Remove NULL termination element in vdso_pagelist 
No need of a NULL last element in pagelists, install_special_mapping()
knows how long the list is.

Remove that element.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e58d95ab859e3cbc9bae3c9ce2959e17d2864f5d.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
abcdbd039e powerpc/vdso: Remove get_page() in vdso_pagelist initialization 
Partly copied from commit 16fb1a9bec ("arm64: vdso: clean up
vdso_pagelist initialization").

No need to get_page() the vdso text/data - these are part of the
kernel image.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/9d14540bd10832b6c9519d74fb5728fdc4974b36.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
1bb30b7a45 powerpc/vdso: Rename syscall_map_32/64 to simplify vdso_setup_syscall_map() 
Today vdso_data structure has:
- syscall_map_32[] and syscall_map_64[] on PPC64
- syscall_map_32[] on PPC32

On PPC32, syscall_map_32[] is populated using sys_call_table[].

On PPC64, syscall_map_64[] is populated using sys_call_table[]
and syscal_map_32[] is populated using compat_sys_call_table[].

To simplify vdso_setup_syscall_map(),
- On PPC32 rename syscall_map_32[] into syscall_map[],
- On PPC64 rename syscall_map_64[] into syscall_map[],
- On PPC64 rename syscall_map_32[] into compat_syscall_map[].

That way, syscall_map[] gets populated using sys_call_table[] and
compat_syscall_map[] gets population using compat_sys_call_table[].

Also define an empty compat_syscall_map[] on PPC32 to avoid ifdefs.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/472734be0d9991eee320a06824219a5b2663736b.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
bc9d5bfc4d powerpc/vdso: Add missing includes and clean vdso_setup_syscall_map() 
Instead of including extern references locally in
vdso_setup_syscall_map(), add the missing headers.

sys_ni_syscall() being a function, cast its address to
an unsigned long instead of declaring it as a fake
unsigned long object.

At the same time, remove a comment which paraphrases the
function name.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b4afedce748ed2858299ceab5ae29b52109263ef.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
7fe2de246e powerpc/vdso: Stripped VDSO is not needed, don't build it 
Since commit 24b659a138 ("powerpc: Use unstripped VDSO image for
more accurate profiling data"), only the unstripped VDSO image
has been used.

Partially revert commit 8150caad02 ("[POWERPC] powerpc vDSO: install
unstripped copies on disk") to avoid building the stripped version.

And the unstripped version in $(MODLIB)/vdso/ is not required
anymore as it is the one embedded in the kernel image.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5986ca25be44fe6e9790486304507f240077d8c4.1601197618.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
ef75e73182 powerpc/signal32: Transform save_user_regs() and save_tm_user_regs() in 'unsafe' version 
Change those two functions to be used within a user access block.

For that, change save_general_regs() to and unsafe_save_general_regs(),
then replace all user accesses by unsafe_ versions.

This series leads to a reduction from 2.55s to 1.73s of
the system CPU time with the following microbench app
on an mpc832x with KUAP (approx 32%)

Without KUAP, the difference is in the noise.

	void sigusr1(int sig) { }

	int main(int argc, char **argv)
	{
		int i = 100000;

		signal(SIGUSR1, sigusr1);
		for (;i--;)
		    raise(SIGUSR1);
		exit(0);
	}

An additional 0.10s reduction is achieved by removing
CONFIG_PPC_FPU, as the mpc832x has no FPU.

A bit less spectacular on an 8xx as KUAP is less heavy, prior to
the series (with KUAP) it ran in 8.10 ms. Once applies the removal
of FPU regs handling, we get 7.05s. With the full series, we get 6.9s.
If artificially re-activating FPU regs handling with the full series,
we get 7.6s.

So for the 8xx, the removal of the FPU regs copy is what makes the
difference, but the rework of handle_signal also have a benefit.

Same as above, without KUAP the difference is in the noise.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Fixup typo in SPE handling]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c7b37b385ccf9666066452e58f018a86573f83e8.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:15 +11:00
Christophe Leroy
968c4fccd1 powerpc/signal32: Isolate non-copy actions in save_user_regs() and save_tm_user_regs() 
Reorder actions in save_user_regs() and save_tm_user_regs() to
regroup copies together in order to switch to user_access_begin()
logic in a later patch.

Move non-copy actions into new functions called
prepare_save_user_regs() and prepare_save_tm_user_regs().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f6eac65781b4a57220477c8864bca2b57f29a5d5.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:14 +11:00
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
Christophe Leroy
31147d7d61 powerpc/signal32: Switch swap_context() to user_access_begin() logic 
As this was the last user of put_sigset_t(), remove it as well.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c3ac4f2d134a3391bb51bdaa2d00e9a409aba9f8.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:14 +11:00
Christophe Leroy
de781ebdf6 powerpc/signal32: Add and use unsafe_put_sigset_t() 
put_sigset_t() calls copy_to_user() for copying two words.

This is terribly inefficient for copying two words.

By switching to unsafe_put_user(), we end up with something as
simple as:

 3cc:   81 3d 00 00     lwz     r9,0(r29)
 3d0:   91 26 00 b4     stw     r9,180(r6)
 3d4:   81 3d 00 04     lwz     r9,4(r29)
 3d8:   91 26 00 b8     stw     r9,184(r6)

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/06def97e87ac1c4ae8e3197e0982e1fab7b3c8ae.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:14 +11:00
Christophe Leroy
f1cf4f93de powerpc/signal32: Remove ifdefery in middle of if/else 
MSR_TM_ACTIVE() is always defined and returns always 0 when
CONFIG_PPC_TRANSACTIONAL_MEM is not selected, so the awful
ifdefery in the middle of an if/else can be removed.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f3c36d687e4228f58d5c207a4036aa9ddcc7420a.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:14 +11:00
Christophe Leroy
9504db3e90 powerpc/signal32: Switch handle_rt_signal32() to user_access_begin() logic 
On the same way as handle_signal32(), replace all user
accesses with equivalent unsafe_ versions, and move the
trampoline code icache flush outside the user access block.

Functions that have no unsafe_ equivalent also remains outside
the access block.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2974314226256f958e2984912b48883ef1754185.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
ad65f4909f powerpc/signal32: Switch handle_signal32() to user_access_begin() logic 
Replace the access_ok() by user_access_begin() and change all user
accesses to unsafe_ version.

Move flush_icache_range() outside the user access block.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a27797f781aa00da96f8284c898173d18e952361.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
8d33001dd6 powerpc/signal32: Move signal trampoline setup to handle_[rt_]signal32 
Move signal trampoline setup into handle_signal32()
and handle_rt_signal32().

At the same time, remove the define which hides the mc_pad field
used for trampoline.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e439cc0fa35aa45da6776520777a61848b92fd4b.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
91b8ecd419 powerpc/signal32: Misc changes to make handle_[rt_]_signal32() more similar 
Miscellaneous changes to clean and make handle_signal32() and
handle_rt_signal32() even more similar.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/df0bc8c3b8fa96390c46f611df79b2a94ac21844.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
8e91cf8501 powerpc/signal32: Rename local pointers in handle_rt_signal32() 
Rename pointers in handle_rt_signal32() to make it more similar to
handle_signal32()

tm_frame becomes tm_mctx
frame becomes mctx
rt_sf becomes frame

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/be77477b0f05397876015b218e36548ee8f5e10b.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
3eea688be0 powerpc/signal32: Move handle_signal32() close to handle_rt_signal32() 
Those two functions are similar and serving the same purpose.
To ease refactorisation, move them close to each other.

This is pure move, no code change, no cosmetic. Yes, checkpatch is
not happy, most will clear later.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/dbce67900bf566bcf40179467bf1eb500814c405.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:13 +11:00
Christophe Leroy
debf122c77 powerpc/signal32: Simplify logging in handle_rt_signal32() 
If something is bad in the frame, there is no point in
knowing which part of the frame exactly is wrong as it
got allocated as a single block.

Always print the root address of the frame in case of
failed user access, just like handle_signal32().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/691895bd31fee89a2d8370befd66ad4eff5b63f2.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:12 +11:00
Christophe Leroy
7fe8f773ee powerpc/signal: Refactor bad frame logging 
The logging of bad frame appears half a dozen of times
and is pretty similar.

Create signal_fault() fonction to perform that logging.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fa094445c119fc00315e1c13783b493346306c6a.1597770847.git.christophe.leroy@csgroup.eu
 2020-12-04 01:01:12 +11:00