[kernel] r22793 - in dists/jessie/linux/debian: . patches patches/bugfix/mips
Ben Hutchings
benh at moszumanska.debian.org
Sun Jul 5 23:21:09 UTC 2015
Author: benh
Date: Sun Jul 5 23:21:08 2015
New Revision: 22793
Log:
[mips*] Correct FP ISA requirements (Closes: #781892)
Added:
dists/jessie/linux/debian/patches/bugfix/mips/mips-correct-fp-isa-requirements.patch
dists/jessie/linux/debian/patches/bugfix/mips/mips-normalise-code-flow-in-the-cpu-exception-handle.patch
Modified:
dists/jessie/linux/debian/changelog
dists/jessie/linux/debian/patches/series
Modified: dists/jessie/linux/debian/changelog
==============================================================================
--- dists/jessie/linux/debian/changelog Sun Jul 5 23:09:31 2015 (r22792)
+++ dists/jessie/linux/debian/changelog Sun Jul 5 23:21:08 2015 (r22793)
@@ -271,6 +271,7 @@
[ Ben Hutchings ]
* [x86] vmwgfx: Enable DRM_VMWGFX_FBCON (Closes: #714929)
* [x86] edac: Add edac_ie31200 driver from Linux 3.17 (Closes: #780773)
+ * [mips*] Correct FP ISA requirements (Closes: #781892)
[ Ian Campbell ]
* [xen] xen-netback: return correct ethtool stats (Closes: #786936)
Added: dists/jessie/linux/debian/patches/bugfix/mips/mips-correct-fp-isa-requirements.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ dists/jessie/linux/debian/patches/bugfix/mips/mips-correct-fp-isa-requirements.patch Sun Jul 5 23:21:08 2015 (r22793)
@@ -0,0 +1,275 @@
+From: "Maciej W. Rozycki" <macro at linux-mips.org>
+Date: Fri, 3 Apr 2015 23:26:49 +0100
+Subject: MIPS: Correct FP ISA requirements
+Origin: https://git.kernel.org/linus/2d83fea786d7aeb5b3b76bd492d9b3bccc0f823c
+Bug-Debian: https://bugs.debian.org/781892
+
+Correct ISA requirements for floating-point instructions:
+
+* the CU3 exception signifies a real COP3 instruction in MIPS I & II,
+
+* the BC1FL and BC1TL instructions are not supported in MIPS I,
+
+* the SQRT.fmt instructions are indeed supported in MIPS II,
+
+* the LDC1 and SDC1 instructions are indeed supported in MIPS32r1,
+
+* the CEIL.W.fmt, FLOOR.W.fmt, ROUND.W.fmt and TRUNC.W.fmt instructions
+ are indeed supported in MIPS32,
+
+* the CVT.L.fmt and CVT.fmt.L instructions are indeed supported in
+ MIPS32r2 and MIPS32r6,
+
+* the CEIL.L.fmt, FLOOR.L.fmt, ROUND.L.fmt and TRUNC.L.fmt instructions
+ are indeed supported in MIPS32r2 and MIPS32r6,
+
+* the RSQRT.fmt and RECIP.fmt instructions are indeed supported in
+ MIPS64r1,
+
+Also simplify conditionals for MIPS III and MIPS IV FPU instructions and
+the handling of the MOVCI minor opcode.
+
+Signed-off-by: Maciej W. Rozycki <macro at linux-mips.org>
+Cc: linux-mips at linux-mips.org
+Patchwork: https://patchwork.linux-mips.org/patch/9700/
+Signed-off-by: Ralf Baechle <ralf at linux-mips.org>
+[bwh: Backported to 3.16: drop references to r6]
+---
+ arch/mips/include/asm/cpu-features.h | 6 +++-
+ arch/mips/kernel/traps.c | 23 ++++++++-------
+ arch/mips/math-emu/cp1emu.c | 55 ++++++++++++++++++------------------
+ 3 files changed, 43 insertions(+), 41 deletions(-)
+
+--- a/arch/mips/include/asm/cpu-features.h
++++ b/arch/mips/include/asm/cpu-features.h
+@@ -199,7 +199,11 @@
+ #define cpu_has_mips_4_5_r (cpu_has_mips_4 | cpu_has_mips_5_r)
+ #define cpu_has_mips_5_r (cpu_has_mips_5 | cpu_has_mips_r)
+
+-#define cpu_has_mips_4_5_r2 (cpu_has_mips_4_5 | cpu_has_mips_r2)
++#define cpu_has_mips_3_4_5_64_r2 \
++ (cpu_has_mips_3 | cpu_has_mips_4_5_64_r2)
++#define cpu_has_mips_4_5_64_r2 \
++ (cpu_has_mips_4_5 | cpu_has_mips64r1 | \
++ cpu_has_mips_r2)
+
+ #define cpu_has_mips32 (cpu_has_mips32r1 | cpu_has_mips32r2)
+ #define cpu_has_mips64 (cpu_has_mips64r1 | cpu_has_mips64r2)
+--- a/arch/mips/kernel/traps.c
++++ b/arch/mips/kernel/traps.c
+@@ -1218,19 +1218,18 @@ asmlinkage void do_cpu(struct pt_regs *r
+
+ case 3:
+ /*
+- * Old (MIPS I and MIPS II) processors will set this code
+- * for COP1X opcode instructions that replaced the original
+- * COP3 space. We don't limit COP1 space instructions in
+- * the emulator according to the CPU ISA, so we want to
+- * treat COP1X instructions consistently regardless of which
+- * code the CPU chose. Therefore we redirect this trap to
+- * the FP emulator too.
+- *
+- * Then some newer FPU-less processors use this code
+- * erroneously too, so they are covered by this choice
+- * as well.
++ * The COP3 opcode space and consequently the CP0.Status.CU3
++ * bit and the CP0.Cause.CE=3 encoding have been removed as
++ * of the MIPS III ISA. From the MIPS IV and MIPS32r2 ISAs
++ * up the space has been reused for COP1X instructions, that
++ * are enabled by the CP0.Status.CU1 bit and consequently
++ * use the CP0.Cause.CE=1 encoding for Coprocessor Unusable
++ * exceptions. Some FPU-less processors that implement one
++ * of these ISAs however use this code erroneously for COP1X
++ * instructions. Therefore we redirect this trap to the FP
++ * emulator too.
+ */
+- if (raw_cpu_has_fpu) {
++ if (raw_cpu_has_fpu || !cpu_has_mips_4_5_64_r2) {
+ force_sig(SIGILL, current);
+ break;
+ }
+--- a/arch/mips/math-emu/cp1emu.c
++++ b/arch/mips/math-emu/cp1emu.c
+@@ -955,17 +955,18 @@ emul:
+ likely = 0;
+ switch (MIPSInst_RT(ir) & 3) {
+ case bcfl_op:
+- likely = 1;
++ if (cpu_has_mips_2_3_4_5_r)
++ likely = 1;
++ /* Fall through */
+ case bcf_op:
+ cond = !cond;
+ break;
+ case bctl_op:
+- likely = 1;
++ if (cpu_has_mips_2_3_4_5_r)
++ likely = 1;
++ /* Fall through */
+ case bct_op:
+ break;
+- default:
+- /* thats an illegal instruction */
+- return SIGILL;
+ }
+
+ set_delay_slot(xcp);
+@@ -1005,36 +1006,34 @@ emul:
+
+ switch (MIPSInst_OPCODE(ir)) {
+ case lwc1_op:
+- goto emul;
+-
+ case swc1_op:
+ goto emul;
+
+ case ldc1_op:
+ case sdc1_op:
+- if (cpu_has_mips_2_3_4_5 ||
+- cpu_has_mips64)
++ if (cpu_has_mips_2_3_4_5_r)
+ goto emul;
+
+ return SIGILL;
+- goto emul;
+
+ case cop1_op:
+ goto emul;
+
+ case cop1x_op:
+- if (cpu_has_mips_4_5 || cpu_has_mips64 || cpu_has_mips32r2)
++ if (cpu_has_mips_4_5_64_r2)
+ /* its one of ours */
+ goto emul;
+
+ return SIGILL;
+
+ case spec_op:
+- if (!cpu_has_mips_4_5_r)
+- return SIGILL;
++ switch (MIPSInst_FUNC(ir)) {
++ case movc_op:
++ if (cpu_has_mips_4_5_r)
++ goto emul;
+
+- if (MIPSInst_FUNC(ir) == movc_op)
+- goto emul;
++ return SIGILL;
++ }
+ break;
+ }
+
+@@ -1068,7 +1067,7 @@ emul:
+ break;
+
+ case cop1x_op:
+- if (!cpu_has_mips_4_5 && !cpu_has_mips64 && !cpu_has_mips32r2)
++ if (!cpu_has_mips_4_5_64_r2)
+ return SIGILL;
+
+ sig = fpux_emu(xcp, ctx, ir, fault_addr);
+@@ -1401,7 +1400,7 @@ static int fpu_emu(struct pt_regs *xcp,
+
+ /* unary ops */
+ case fsqrt_op:
+- if (!cpu_has_mips_4_5_r)
++ if (!cpu_has_mips_2_3_4_5_r)
+ return SIGILL;
+
+ handler.u = ieee754sp_sqrt;
+@@ -1413,14 +1412,14 @@ static int fpu_emu(struct pt_regs *xcp,
+ * achieve full IEEE-754 accuracy - however this emulator does.
+ */
+ case frsqrt_op:
+- if (!cpu_has_mips_4_5_r2)
++ if (!cpu_has_mips_4_5_64_r2)
+ return SIGILL;
+
+ handler.u = fpemu_sp_rsqrt;
+ goto scopuop;
+
+ case frecip_op:
+- if (!cpu_has_mips_4_5_r2)
++ if (!cpu_has_mips_4_5_64_r2)
+ return SIGILL;
+
+ handler.u = fpemu_sp_recip;
+@@ -1522,7 +1521,7 @@ copcsr:
+ case ftrunc_op:
+ case fceil_op:
+ case ffloor_op:
+- if (!cpu_has_mips_2_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_2_3_4_5_r)
+ return SIGILL;
+
+ oldrm = ieee754_csr.rm;
+@@ -1534,7 +1533,7 @@ copcsr:
+ goto copcsr;
+
+ case fcvtl_op:
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ SPFROMREG(fs, MIPSInst_FS(ir));
+@@ -1546,7 +1545,7 @@ copcsr:
+ case ftruncl_op:
+ case fceill_op:
+ case ffloorl_op:
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ oldrm = ieee754_csr.rm;
+@@ -1615,13 +1614,13 @@ copcsr:
+ * achieve full IEEE-754 accuracy - however this emulator does.
+ */
+ case frsqrt_op:
+- if (!cpu_has_mips_4_5_r2)
++ if (!cpu_has_mips_4_5_64_r2)
+ return SIGILL;
+
+ handler.u = fpemu_dp_rsqrt;
+ goto dcopuop;
+ case frecip_op:
+- if (!cpu_has_mips_4_5_r2)
++ if (!cpu_has_mips_4_5_64_r2)
+ return SIGILL;
+
+ handler.u = fpemu_dp_recip;
+@@ -1711,7 +1710,7 @@ dcopuop:
+ goto copcsr;
+
+ case fcvtl_op:
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ DPFROMREG(fs, MIPSInst_FS(ir));
+@@ -1723,7 +1722,7 @@ dcopuop:
+ case ftruncl_op:
+ case fceill_op:
+ case ffloorl_op:
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ oldrm = ieee754_csr.rm;
+@@ -1782,7 +1781,7 @@ dcopuop:
+
+ case l_fmt:
+
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ DIFROMREG(bits, MIPSInst_FS(ir));
+@@ -1846,7 +1845,7 @@ dcopuop:
+ SITOREG(rv.w, MIPSInst_FD(ir));
+ break;
+ case l_fmt:
+- if (!cpu_has_mips_3_4_5 && !cpu_has_mips64)
++ if (!cpu_has_mips_3_4_5_64_r2)
+ return SIGILL;
+
+ DITOREG(rv.l, MIPSInst_FD(ir));
Added: dists/jessie/linux/debian/patches/bugfix/mips/mips-normalise-code-flow-in-the-cpu-exception-handle.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ dists/jessie/linux/debian/patches/bugfix/mips/mips-normalise-code-flow-in-the-cpu-exception-handle.patch Sun Jul 5 23:21:08 2015 (r22793)
@@ -0,0 +1,71 @@
+From: "Maciej W. Rozycki" <macro at linux-mips.org>
+Date: Fri, 3 Apr 2015 23:25:08 +0100
+Subject: MIPS: Normalise code flow in the CpU exception handler
+Origin: https://git.kernel.org/linus/27e28e8ec47a5ce335ebf25d34ca356c80635908
+Bug-Debian: https://bugs.debian.org/781892
+
+Changes applied to `do_cpu' over time reduced the use of the SIGILL
+issued with `force_sig' at the end to a single CU3 case only in the
+switch statement there. Move that `force_sig' call over to right where
+required then and toss out the pile of gotos now not needed to skip over
+the call, replacing them with regular breaks out of the switch.
+
+Signed-off-by: Maciej W. Rozycki <macro at linux-mips.org>
+Cc: linux-mips at linux-mips.org
+Patchwork: https://patchwork.linux-mips.org/patch/9683/
+Signed-off-by: Ralf Baechle <ralf at linux-mips.org>
+---
+ arch/mips/kernel/traps.c | 15 +++++++--------
+ 1 file changed, 7 insertions(+), 8 deletions(-)
+
+--- a/arch/mips/kernel/traps.c
++++ b/arch/mips/kernel/traps.c
+@@ -1181,7 +1181,7 @@ asmlinkage void do_cpu(struct pt_regs *r
+ status = -1;
+
+ if (unlikely(compute_return_epc(regs) < 0))
+- goto out;
++ break;
+
+ if (get_isa16_mode(regs->cp0_epc)) {
+ unsigned short mmop[2] = { 0 };
+@@ -1214,7 +1214,7 @@ asmlinkage void do_cpu(struct pt_regs *r
+ force_sig(status, current);
+ }
+
+- goto out;
++ break;
+
+ case 3:
+ /*
+@@ -1230,8 +1230,10 @@ asmlinkage void do_cpu(struct pt_regs *r
+ * erroneously too, so they are covered by this choice
+ * as well.
+ */
+- if (raw_cpu_has_fpu)
++ if (raw_cpu_has_fpu) {
++ force_sig(SIGILL, current);
+ break;
++ }
+ /* Fall through. */
+
+ case 1:
+@@ -1247,16 +1249,13 @@ asmlinkage void do_cpu(struct pt_regs *r
+ mt_ase_fp_affinity();
+ }
+
+- goto out;
++ break;
+
+ case 2:
+ raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
+- goto out;
++ break;
+ }
+
+- force_sig(SIGILL, current);
+-
+-out:
+ exception_exit(prev_state);
+ }
+
Modified: dists/jessie/linux/debian/patches/series
==============================================================================
--- dists/jessie/linux/debian/patches/series Sun Jul 5 23:09:31 2015 (r22792)
+++ dists/jessie/linux/debian/patches/series Sun Jul 5 23:21:08 2015 (r22793)
@@ -618,3 +618,5 @@
debian/tcp-fix-abi-change-in-3.16.7-ckt7.patch
debian/usb-avoid-abi-change-in-3.16.7-ckt8.patch
debian/procfs-avoid-abi-change-in-3.16.7-ckt8.patch
+bugfix/mips/mips-normalise-code-flow-in-the-cpu-exception-handle.patch
+bugfix/mips/mips-correct-fp-isa-requirements.patch
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