[linux] 01/01: [mips*el] Fix BPF assembly code for pre-R2 CPUs.
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Sat Sep 5 17:46:36 UTC 2015
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aurel32 pushed a commit to branch master
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commit 5c7b00ac36a38fcbd458da241fce91081cbcafcf
Author: Aurelien Jarno <aurelien at aurel32.net>
Date: Sat Sep 5 19:40:41 2015 +0200
[mips*el] Fix BPF assembly code for pre-R2 CPUs.
---
debian/changelog | 4 +
...f-avoid-unreachable-code-on-little-endian.patch | 49 +++++++++
...pf-fix-build-on-pre-r2-little-endian-cpus.patch | 117 +++++++++++++++++++++
debian/patches/series | 2 +
4 files changed, 172 insertions(+)
diff --git a/debian/changelog b/debian/changelog
index ce0e1d0..3b41a22 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,11 +1,15 @@
linux (4.2-1~exp2) UNRELEASED; urgency=medium
+ [ Ben Hutchings ]
* [mips*el/loongson-3] udeb: Add fb-modules containing radeon driver
(Closes: #776274)
* [hppa/parisc64-smp,[mips*el/loongson-3] udeb: Add i2c-modules and
make fb-modules depend on it rather than including I2C modules
directly
+ [ Aurelien Jarno ]
+ * [mips*el] Fix BPF assembly code for pre-R2 CPUs.
+
-- Ben Hutchings <ben at decadent.org.uk> Wed, 02 Sep 2015 00:29:36 +0100
linux (4.2-1~exp1) experimental; urgency=medium
diff --git a/debian/patches/bugfix/mips/bpf-avoid-unreachable-code-on-little-endian.patch b/debian/patches/bugfix/mips/bpf-avoid-unreachable-code-on-little-endian.patch
new file mode 100644
index 0000000..288347e
--- /dev/null
+++ b/debian/patches/bugfix/mips/bpf-avoid-unreachable-code-on-little-endian.patch
@@ -0,0 +1,49 @@
+From: Aurelien Jarno <aurelien at aurel32.net>
+Date: Fri, 4 Sep 2015 16:32:17 +0200
+Subject: [1/2] MIPS: BPF: Avoid unreachable code on little endian
+Origin: http://www.linux-mips.org/archives/linux-mips/2015-09/msg00040.html
+
+On little endian, avoid generating the big endian version of the code
+by using #else in addition to #ifdef #endif. Also fix one alignment
+issue wrt delay slot.
+
+Cc: Ralf Baechle <ralf at linux-mips.org>
+Cc: Markos Chandras <markos.chandras at imgtec.com>
+Cc: stable at vger.kernel.org # v4.2+
+Signed-off-by: Aurelien Jarno <aurelien at aurel32.net>
+---
+ arch/mips/net/bpf_jit_asm.S | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/arch/mips/net/bpf_jit_asm.S b/arch/mips/net/bpf_jit_asm.S
+index e927260..4f54cb1 100644
+--- a/arch/mips/net/bpf_jit_asm.S
++++ b/arch/mips/net/bpf_jit_asm.S
+@@ -151,9 +151,10 @@ NESTED(bpf_slow_path_word, (6 * SZREG), $r_sp)
+ wsbh t0, $r_s0
+ jr $r_ra
+ rotr $r_A, t0, 16
+-#endif
++#else
+ jr $r_ra
+- move $r_A, $r_s0
++ move $r_A, $r_s0
++#endif
+
+ END(bpf_slow_path_word)
+
+@@ -162,9 +163,10 @@ NESTED(bpf_slow_path_half, (6 * SZREG), $r_sp)
+ #ifdef CONFIG_CPU_LITTLE_ENDIAN
+ jr $r_ra
+ wsbh $r_A, $r_s0
+-#endif
++#else
+ jr $r_ra
+ move $r_A, $r_s0
++#endif
+
+ END(bpf_slow_path_half)
+
+--
+2.1.4
+
diff --git a/debian/patches/bugfix/mips/bpf-fix-build-on-pre-r2-little-endian-cpus.patch b/debian/patches/bugfix/mips/bpf-fix-build-on-pre-r2-little-endian-cpus.patch
new file mode 100644
index 0000000..1b63e1b
--- /dev/null
+++ b/debian/patches/bugfix/mips/bpf-fix-build-on-pre-r2-little-endian-cpus.patch
@@ -0,0 +1,117 @@
+From: Aurelien Jarno <aurelien at aurel32.net>
+Date: Sat, 5 Sep 2015 17:02:59 +0200
+Subject: [2/2] MIPS: BPF: Fix build on pre-R2 little endian CPUs
+Origin: http://www.linux-mips.org/archives/linux-mips/2015-09/msg00041.html
+
+The rotr, seh and wsbh instructions have been introduced with the R2
+ISA. Thus the current BPF code fails to build on pre-R2 little endian
+CPUs:
+
+ CC arch/mips/net/bpf_jit.o
+ AS arch/mips/net/bpf_jit_asm.o
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S: Assembler messages:
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:67: Error: opcode not supported on this processor: mips32 (mips32) `wsbh $8,$19'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:68: Error: opcode not supported on this processor: mips32 (mips32) `rotr $19,$8,16'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:83: Error: opcode not supported on this processor: mips32 (mips32) `wsbh $8,$19'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:84: Error: opcode not supported on this processor: mips32 (mips32) `seh $19,$8'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:151: Error: opcode not supported on this processor: mips32 (mips32) `wsbh $8,$12'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:153: Error: opcode not supported on this processor: mips32 (mips32) `rotr $19,$8,16'
+ /home/aurel32/linux-4.2/arch/mips/net/bpf_jit_asm.S:164: Error: opcode not supported on this processor: mips32 (mips32) `wsbh $19,$12'
+ /home/aurel32/linux-4.2/scripts/Makefile.build:294: recipe for target 'arch/mips/net/bpf_jit_asm.o' failed
+
+Fix that by providing equivalent code for these CPUs.
+
+Cc: Ralf Baechle <ralf at linux-mips.org>
+Cc: Markos Chandras <markos.chandras at imgtec.com>
+Cc: stable at vger.kernel.org # v4.2+
+Signed-off-by: Aurelien Jarno <aurelien at aurel32.net>
+---
+ arch/mips/net/bpf_jit_asm.S | 42 ++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 42 insertions(+)
+
+diff --git a/arch/mips/net/bpf_jit_asm.S b/arch/mips/net/bpf_jit_asm.S
+index 4f54cb1..dabf417 100644
+--- a/arch/mips/net/bpf_jit_asm.S
++++ b/arch/mips/net/bpf_jit_asm.S
+@@ -64,8 +64,20 @@ sk_load_word_positive:
+ PTR_ADDU t1, $r_skb_data, offset
+ lw $r_A, 0(t1)
+ #ifdef CONFIG_CPU_LITTLE_ENDIAN
++# if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
+ wsbh t0, $r_A
+ rotr $r_A, t0, 16
++# else
++ sll t0, $r_A, 24
++ srl t1, $r_A, 24
++ srl t2, $r_A, 8
++ or t0, t0, t1
++ andi t2, t2, 0xff00
++ andi t1, $r_A, 0xff00
++ or t0, t0, t2
++ sll t1, t1, 8
++ or $r_A, t0, t1
++# endif
+ #endif
+ jr $r_ra
+ move $r_ret, zero
+@@ -80,8 +92,16 @@ sk_load_half_positive:
+ PTR_ADDU t1, $r_skb_data, offset
+ lh $r_A, 0(t1)
+ #ifdef CONFIG_CPU_LITTLE_ENDIAN
++# if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
+ wsbh t0, $r_A
+ seh $r_A, t0
++# else
++ sll t0, $r_A, 24
++ andi t1, $r_A, 0xff00
++ sra t0, t0, 16
++ srl t1, t1, 8
++ or $r_A, t0, t1
++# endif
+ #endif
+ jr $r_ra
+ move $r_ret, zero
+@@ -148,9 +168,22 @@ sk_load_byte_positive:
+ NESTED(bpf_slow_path_word, (6 * SZREG), $r_sp)
+ bpf_slow_path_common(4)
+ #ifdef CONFIG_CPU_LITTLE_ENDIAN
++# if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
+ wsbh t0, $r_s0
+ jr $r_ra
+ rotr $r_A, t0, 16
++# else
++ sll t0, $r_s0, 24
++ srl t1, $r_s0, 24
++ srl t2, $r_s0, 8
++ or t0, t0, t1
++ andi t2, t2, 0xff00
++ andi t1, $r_s0, 0xff00
++ or t0, t0, t2
++ sll t1, t1, 8
++ jr $r_ra
++ or $r_A, t0, t1
++# endif
+ #else
+ jr $r_ra
+ move $r_A, $r_s0
+@@ -161,8 +194,17 @@ NESTED(bpf_slow_path_word, (6 * SZREG), $r_sp)
+ NESTED(bpf_slow_path_half, (6 * SZREG), $r_sp)
+ bpf_slow_path_common(2)
+ #ifdef CONFIG_CPU_LITTLE_ENDIAN
++# if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
+ jr $r_ra
+ wsbh $r_A, $r_s0
++# else
++ sll t0, $r_s0, 8
++ andi t1, $r_s0, 0xff00
++ andi t0, t0, 0xff00
++ srl t1, t1, 8
++ jr $r_ra
++ or $r_A, t0, t1
++# endif
+ #else
+ jr $r_ra
+ move $r_A, $r_s0
+--
+2.1.4
+
diff --git a/debian/patches/series b/debian/patches/series
index 85425ff..b9805de 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -46,6 +46,8 @@ debian/qxl-disable-modeset-by-default.patch
# Arch bug fixes
bugfix/mips/disable-advansys.patch
+bugfix/mips/bpf-avoid-unreachable-code-on-little-endian.patch
+bugfix/mips/bpf-fix-build-on-pre-r2-little-endian-cpus.patch
bugfix/arm64/arm64-add-missing-dts-entry-for-X-Gene-platform.patch
bugfix/arm64/arm64-removed-using-of-the-mask-attribute-in-the-dts.patch
--
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