From 1658f914ff91c3bf572d5ddae3773720f6803d20 Mon Sep 17 00:00:00 2001 From: "Steven J. Hill" Date: Mon, 25 Mar 2013 13:22:59 -0500 Subject: [PATCH] MIPS: microMIPS: Disable LL/SC and fix linker bug. Partially revert commit e0c14a260d66ba35935600d6435940a566fe806b and turn off LL/SC when building a pure microMIPS kernel. This is a temporary fix until the cmpxchg assembly macro functions are re-written to not use the HI/LO registers in address calculations. Also add .insn in selected user access functions which would otherwise produce ISA mode jump incompatibilities. This is also a temporary fix. Signed-off-by: Steven J. Hill --- .../include/asm/mach-sead3/cpu-feature-overrides.h | 4 ++++ arch/mips/include/asm/uaccess.h | 14 ++++++++++++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/mips/include/asm/mach-sead3/cpu-feature-overrides.h b/arch/mips/include/asm/mach-sead3/cpu-feature-overrides.h index 193c0912d38e..bfbd7035d4c5 100644 --- a/arch/mips/include/asm/mach-sead3/cpu-feature-overrides.h +++ b/arch/mips/include/asm/mach-sead3/cpu-feature-overrides.h @@ -28,7 +28,11 @@ /* #define cpu_has_prefetch ? */ #define cpu_has_mcheck 1 /* #define cpu_has_ejtag ? */ +#ifdef CONFIG_CPU_MICROMIPS +#define cpu_has_llsc 0 +#else #define cpu_has_llsc 1 +#endif /* #define cpu_has_vtag_icache ? */ /* #define cpu_has_dc_aliases ? */ /* #define cpu_has_ic_fills_f_dc ? */ diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index bd87e36bf26a..1c9edd63dda7 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -261,6 +261,7 @@ do { \ __asm__ __volatile__( \ "1: " insn " %1, %3 \n" \ "2: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "3: li %0, %4 \n" \ " j 2b \n" \ @@ -287,7 +288,9 @@ do { \ __asm__ __volatile__( \ "1: lw %1, (%3) \n" \ "2: lw %D1, 4(%3) \n" \ - "3: .section .fixup,\"ax\" \n" \ + "3: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ "4: li %0, %4 \n" \ " move %1, $0 \n" \ " move %D1, $0 \n" \ @@ -355,6 +358,7 @@ do { \ __asm__ __volatile__( \ "1: " insn " %z2, %3 # __put_user_asm\n" \ "2: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "3: li %0, %4 \n" \ " j 2b \n" \ @@ -373,6 +377,7 @@ do { \ "1: sw %2, (%3) # __put_user_asm_ll32 \n" \ "2: sw %D2, 4(%3) \n" \ "3: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "4: li %0, %4 \n" \ " j 3b \n" \ @@ -524,6 +529,7 @@ do { \ __asm__ __volatile__( \ "1: " insn " %1, %3 \n" \ "2: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "3: li %0, %4 \n" \ " j 2b \n" \ @@ -549,7 +555,9 @@ do { \ "1: ulw %1, (%3) \n" \ "2: ulw %D1, 4(%3) \n" \ " move %0, $0 \n" \ - "3: .section .fixup,\"ax\" \n" \ + "3: \n" \ + " .insn \n" \ + " .section .fixup,\"ax\" \n" \ "4: li %0, %4 \n" \ " move %1, $0 \n" \ " move %D1, $0 \n" \ @@ -616,6 +624,7 @@ do { \ __asm__ __volatile__( \ "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \ "2: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "3: li %0, %4 \n" \ " j 2b \n" \ @@ -634,6 +643,7 @@ do { \ "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \ "2: sw %D2, 4(%3) \n" \ "3: \n" \ + " .insn \n" \ " .section .fixup,\"ax\" \n" \ "4: li %0, %4 \n" \ " j 3b \n" \ -- 2.39.5