linux-toradex.git/arch/powerpc/kernel/ptrace/Makefile, branch v6.7

powerpc/ptrace: Don't return error when getting/setting FP regs without CONFIG_PPC_FPU_REGS

2021-04-01T13:15:37+00:00

An #ifdef CONFIG_PPC_FPU_REGS is missing in arch_ptrace() leading
to the following Oops because [REGSET_FPR] entry is not initialised in
native_regsets[].

[   41.917608] BUG: Unable to handle kernel instruction fetch
[   41.922849] Faulting instruction address: 0xff8fd228
[   41.927760] Oops: Kernel access of bad area, sig: 11 [#1]
[   41.933089] BE PAGE_SIZE=4K PREEMPT CMPC885
[   41.940753] Modules linked in:
[   41.943768] CPU: 0 PID: 366 Comm: gdb Not tainted 5.12.0-rc5-s3k-dev-01666-g7aac86a0f057-dirty #4835
[   41.952800] NIP:  ff8fd228 LR: c004d9e0 CTR: ff8fd228
[   41.957790] REGS: caae9df0 TRAP: 0400   Not tainted  (5.12.0-rc5-s3k-dev-01666-g7aac86a0f057-dirty)
[   41.966741] MSR:  40009032   CR: 82004248  XER: 20000000
[   41.973540]
[   41.973540] GPR00: c004d9b4 caae9eb0 c1b64f60 c1b64520 c0713cd4 caae9eb8 c1bacdfc 00000004
[   41.973540] GPR08: 00000200 ff8fd228 c1bac700 00001032 28004242 1061aaf4 00000001 106d64a0
[   41.973540] GPR16: 00000000 00000000 7fa0a774 10610000 7fa0aef9 00000000 10610000 7fa0a538
[   41.973540] GPR24: 7fa0a580 7fa0a570 c1bacc00 c1b64520 c1bacc00 caae9ee8 00000108 c0713cd4
[   42.009685] NIP [ff8fd228] 0xff8fd228
[   42.013300] LR [c004d9e0] __regset_get+0x100/0x124
[   42.018036] Call Trace:
[   42.020443] [caae9eb0] [c004d9b4] __regset_get+0xd4/0x124 (unreliable)
[   42.026899] [caae9ee0] [c004da94] copy_regset_to_user+0x5c/0xb0
[   42.032751] [caae9f10] [c002f640] sys_ptrace+0xe4/0x588
[   42.037915] [caae9f30] [c0011010] ret_from_syscall+0x0/0x28
[   42.043422] --- interrupt: c00 at 0xfd1f8e4
[   42.047553] NIP:  0fd1f8e4 LR: 1004a688 CTR: 00000000
[   42.052544] REGS: caae9f40 TRAP: 0c00   Not tainted  (5.12.0-rc5-s3k-dev-01666-g7aac86a0f057-dirty)
[   42.061494] MSR:  0000d032   CR: 48004442  XER: 00000000
[   42.068551]
[   42.068551] GPR00: 0000001a 7fa0a040 77dad7e0 0000000e 00000170 00000000 7fa0a078 00000004
[   42.068551] GPR08: 00000000 108deb88 108dda40 106d6010 44004442 1061aaf4 00000001 106d64a0
[   42.068551] GPR16: 00000000 00000000 7fa0a774 10610000 7fa0aef9 00000000 10610000 7fa0a538
[   42.068551] GPR24: 7fa0a580 7fa0a570 1078fe00 1078fd70 1078fd70 00000170 0fdd3244 0000000d
[   42.104696] NIP [0fd1f8e4] 0xfd1f8e4
[   42.108225] LR [1004a688] 0x1004a688
[   42.111753] --- interrupt: c00
[   42.114768] Instruction dump:
[   42.117698] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
[   42.125443] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
[   42.133195] ---[ end trace d35616f22ab2100c ]---

Adding the missing #ifdef is not good because gdb doesn't like getting
an error when getting registers.

Instead, make ptrace return 0s when CONFIG_PPC_FPU_REGS is not set.

Fixes: b6254ced4da6 ("powerpc/signal: Don't manage floating point regs when no FPU")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/9121a44a2d50ba1af18d8aa5ada06c9a3bea8afd.1617200085.git.christophe.leroy@csgroup.eu

powerpc/signal: Don't manage floating point regs when no FPU

2020-12-03T14:01:11+00:00

There is no point in copying floating point regs when there
is no FPU and MATH_EMULATION is not selected.

Create a new CONFIG_PPC_FPU_REGS bool that is selected by
CONFIG_MATH_EMULATION and CONFIG_PPC_FPU, and use it to
opt out everything related to fp_state in thread_struct.

The asm const used only by fpu.S are opted out with CONFIG_PPC_FPU
as fpu.S build is conditionnal to CONFIG_PPC_FPU.

The following app spends approx 8.1 seconds system time on an 8xx
without the patch, and 7.0 seconds with the patch (13.5% reduction).

On an 832x, it spends approx 2.6 seconds system time without
the patch and 2.1 seconds with the patch (19% reduction).

	void sigusr1(int sig) { }

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

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

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/7569070083e6cd5b279bb5023da601aba3c06f3c.1597770847.git.christophe.leroy@csgroup.eu

powerpc/ptrace: Create ptrace_get_fpr() and ptrace_put_fpr()

2020-12-03T14:01:11+00:00

On the same model as ptrace_get_reg() and ptrace_put_reg(),
create ptrace_get_fpr() and ptrace_put_fpr() to get/set
the floating points registers.

We move the boundary checkings in them.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/24a1baedea7f7ae7b6bf27be98bab6d01b5ca2c1.1597770847.git.christophe.leroy@csgroup.eu

powerpc/64: make buildable without CONFIG_COMPAT

2020-04-02T13:10:00+00:00

There are numerous references to 32bit functions in generic and 64bit
code so ifdef them out.

Signed-off-by: Michal Suchanek 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/e5619617020ef3a1f54f0c076e7d74cb9ec9f3bf.1584699455.git.msuchanek@suse.de

powerpc/ptrace: split out ADV_DEBUG_REGS related functions.

2020-04-01T03:30:49+00:00

Move ADV_DEBUG_REGS functions out of ptrace.c, into
ptrace-adv.c and ptrace-noadv.c

Signed-off-by: Christophe Leroy 
[mpe: Squash in fixup patch from Christophe]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/e2bd7d275bd5933d848aad4fee3ca652a14d039b.1582848567.git.christophe.leroy@c-s.fr

powerpc/ptrace: move register viewing functions out of ptrace.c

2020-04-01T03:30:48+00:00

Create a dedicated ptrace-view.c file.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/bfd8c3ed57c9057e4a5d3816737b5ee98c6f7e43.1582848567.git.christophe.leroy@c-s.fr

powerpc/ptrace: split out TRANSACTIONAL_MEM related functions.

2020-04-01T03:30:48+00:00

Move TRANSACTIONAL_MEM functions out of ptrace.c, into
ptrace-tm.c

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/2d0ef3bb2610c0344bd42252c7134f429818c000.1582848567.git.christophe.leroy@c-s.fr

powerpc/ptrace: split out SPE related functions.

2020-04-01T03:30:48+00:00

Move CONFIG_SPE functions out of ptrace.c, into
ptrace-spe.c

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/0f17a331760310b5562fae3791cdd3cf9c64237b.1582848567.git.christophe.leroy@c-s.fr

powerpc/ptrace: split out ALTIVEC related functions.

2020-04-01T03:30:48+00:00

Move CONFIG_ALTIVEC functions out of ptrace.c, into
ptrace-altivec.c

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/35dae891d01c817fca0fd6ab406a3a2c7bf07f60.1582848567.git.christophe.leroy@c-s.fr

powerpc/ptrace: split out VSX related functions.

2020-04-01T03:30:48+00:00

Move CONFIG_VSX functions out of ptrace.c, into
ptrace-vsx.c and ptrace-novsx.c

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/dc8e20c8c95b7e83add0c6dd48f9470628896c5c.1582848567.git.christophe.leroy@c-s.fr