--- /dev/null
+From bb04c220d82598066eeadf49defaec1157d4d206 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@gmail.com>
+Date: Sat, 25 Jul 2020 11:46:01 +0200
+Subject: [PATCH] mips: Do not include hi and lo in clobber list for R6
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From [1]
+"GCC 10 (PR 91233) won't silently allow registers that are not architecturally
+available to be present in the clobber list anymore, resulting in build failure
+for mips*r6 targets in form of:
+...
+.../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target
+ 146 | __asm__ volatile ( \
+ | ^~~~~~~
+
+This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension.
+This patch provides the alternative clobber list for r6 targets that won't include
+those registers."
+
+Since kernel 5.4 and mips support for generic vDSO [2], the kernel fail to build
+for mips r6 cpus with gcc 10 for the same reason as glibc.
+
+[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=020b2a97bb15f807c0482f0faee2184ed05bcad8
+[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=24640f233b466051ad3a5d2786d2951e43026c9d
+
+Signed-off-by: Romain Naour <romain.naour@gmail.com>
+---
+ arch/mips/include/asm/vdso/gettimeofday.h | 45 +++++++++++++++++++++++
+ 1 file changed, 45 insertions(+)
+
+diff --git a/arch/mips/include/asm/vdso/gettimeofday.h b/arch/mips/include/asm/vdso/gettimeofday.h
+index 0ae9b4cbc153..ea600e0ebfe7 100644
+--- a/arch/mips/include/asm/vdso/gettimeofday.h
++++ b/arch/mips/include/asm/vdso/gettimeofday.h
+@@ -36,12 +36,21 @@ static __always_inline long gettimeofday_fallback(
+ register long nr asm("v0") = __NR_gettimeofday;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (tv), "r" (tz), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (tv), "r" (tz), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -60,12 +69,21 @@ static __always_inline long clock_gettime_fallback(
+ #endif
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -84,12 +102,21 @@ static __always_inline int clock_getres_fallback(
+ #endif
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -108,12 +135,21 @@ static __always_inline long clock_gettime32_fallback(
+ register long nr asm("v0") = __NR_clock_gettime;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -128,12 +164,21 @@ static __always_inline int clock_getres32_fallback(
+ register long nr asm("v0") = __NR_clock_getres;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+--
+2.25.4
+
--- /dev/null
+From bb04c220d82598066eeadf49defaec1157d4d206 Mon Sep 17 00:00:00 2001
+From: Romain Naour <romain.naour@gmail.com>
+Date: Sat, 25 Jul 2020 11:46:01 +0200
+Subject: [PATCH] mips: Do not include hi and lo in clobber list for R6
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From [1]
+"GCC 10 (PR 91233) won't silently allow registers that are not architecturally
+available to be present in the clobber list anymore, resulting in build failure
+for mips*r6 targets in form of:
+...
+.../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target
+ 146 | __asm__ volatile ( \
+ | ^~~~~~~
+
+This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension.
+This patch provides the alternative clobber list for r6 targets that won't include
+those registers."
+
+Since kernel 5.4 and mips support for generic vDSO [2], the kernel fail to build
+for mips r6 cpus with gcc 10 for the same reason as glibc.
+
+[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=020b2a97bb15f807c0482f0faee2184ed05bcad8
+[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=24640f233b466051ad3a5d2786d2951e43026c9d
+
+Signed-off-by: Romain Naour <romain.naour@gmail.com>
+---
+ arch/mips/include/asm/vdso/gettimeofday.h | 45 +++++++++++++++++++++++
+ 1 file changed, 45 insertions(+)
+
+diff --git a/arch/mips/include/asm/vdso/gettimeofday.h b/arch/mips/include/asm/vdso/gettimeofday.h
+index 0ae9b4cbc153..ea600e0ebfe7 100644
+--- a/arch/mips/include/asm/vdso/gettimeofday.h
++++ b/arch/mips/include/asm/vdso/gettimeofday.h
+@@ -36,12 +36,21 @@ static __always_inline long gettimeofday_fallback(
+ register long nr asm("v0") = __NR_gettimeofday;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (tv), "r" (tz), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (tv), "r" (tz), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -60,12 +69,21 @@ static __always_inline long clock_gettime_fallback(
+ #endif
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -84,12 +102,21 @@ static __always_inline int clock_getres_fallback(
+ #endif
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -108,12 +135,21 @@ static __always_inline long clock_gettime32_fallback(
+ register long nr asm("v0") = __NR_clock_gettime;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+@@ -128,12 +164,21 @@ static __always_inline int clock_getres32_fallback(
+ register long nr asm("v0") = __NR_clock_getres;
+ register long error asm("a3");
+
++#if MIPS_ISA_REV >= 6
++ asm volatile(
++ " syscall\n"
++ : "=r" (ret), "=r" (error)
++ : "r" (clkid), "r" (ts), "r" (nr)
++ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
++ "$14", "$15", "$24", "$25", "memory");
++#else
+ asm volatile(
+ " syscall\n"
+ : "=r" (ret), "=r" (error)
+ : "r" (clkid), "r" (ts), "r" (nr)
+ : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
+ "$14", "$15", "$24", "$25", "hi", "lo", "memory");
++#endif
+
+ return error ? -ret : ret;
+ }
+--
+2.25.4
+
BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/mips32r6-malta/linux.config"
BR2_LINUX_KERNEL_VMLINUX=y
+BR2_GLOBAL_PATCH_DIR="board/qemu/mips32r6-malta/patches"
# Serial port config
BR2_TARGET_GENERIC_GETTY=y
BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/mips32r6el-malta/linux.config"
BR2_LINUX_KERNEL_VMLINUX=y
+BR2_GLOBAL_PATCH_DIR="board/qemu/mips32r6el-malta/patches"
# Serial port config
BR2_TARGET_GENERIC_GETTY=y