linux4.19: enable ppcle support

srcpkgs/linux4.19/files/ppc64le-dotconfig

@@ -241,6 +241,7 @@ CONFIG_FORCE_SMP=y
 CONFIG_SMP=y
 CONFIG_NR_CPUS=2048
 CONFIG_PPC_DOORBELL=y
+CONFIG_VDSO32=y
 # CONFIG_CPU_BIG_ENDIAN is not set
 CONFIG_CPU_LITTLE_ENDIAN=y
 CONFIG_PPC64_BOOT_WRAPPER=y

srcpkgs/linux4.19/patches/ppcle-broken-vdso.patch

@@ -0,0 +1,21 @@
+Disable vDSOs which are broken on 32 bit LE.
+
+Source: @eerykitty
+
+diff --git a/arch/powerpc/kernel/vdso32/vdso32.lds.S b/arch/powerpc/kernel/vdso32/vdso32.lds.S
+index ce3e7f3e5..7600f9c11 100644
+--- a/arch/powerpc/kernel/vdso32/vdso32.lds.S
++++ b/arch/powerpc/kernel/vdso32/vdso32.lds.S
+@@ -144,10 +144,12 @@ VERSION
+ 		__kernel_datapage_offset;
+ 
+ 		__kernel_get_syscall_map;
++#ifndef __LITTLE_ENDIAN__
+ 		__kernel_gettimeofday;
+ 		__kernel_clock_gettime;
+ 		__kernel_clock_getres;
+ 		__kernel_get_tbfreq;
++#endif
+ 		__kernel_sync_dicache;
+ 		__kernel_sync_dicache_p5;
+ 		__kernel_sigtramp32;

srcpkgs/linux4.19/patches/ppcle-enable.patch

@@ -0,0 +1,33 @@
+These are experimental fixes for running 32-bit little endian binaries on
+Linux/ppc64le. While this may seem pointless, it does work, does not break
+anything, and may allow enablement of things we couldn't do before (e.g.
+support for box86 and thus reasonably fast emulation of 32-bit x86 games).
+
+The first part is a signal handler fix, the second part enables the 32-bit
+VDSO by removing the ppc32/big endian restriction.
+
+Source: @eerykitty
+
+--- a/arch/powerpc/kernel/signal_32.c
++++ b/arch/powerpc/kernel/signal_32.c
+@@ -1423,8 +1423,9 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
+ 	regs->gpr[3] = ksig->sig;
+ 	regs->gpr[4] = (unsigned long) sc;
+ 	regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
+-	/* enter the signal handler in big-endian mode */
++	/* enter the signal handler in native-endian mode */
+ 	regs->msr &= ~MSR_LE;
++	regs->msr |= (MSR_KERNEL & MSR_LE);
+ 	return 0;
+ 
+ badframe:
+--- a/arch/powerpc/platforms/Kconfig.cputype
++++ b/arch/powerpc/platforms/Kconfig.cputype
+@@ -429,7 +429,6 @@ endmenu
+ 
+ config VDSO32
+ 	def_bool y
+-	depends on PPC32 || CPU_BIG_ENDIAN
+ 	help
+ 	  This symbol controls whether we build the 32-bit VDSO. We obviously
+ 	  want to do that if we're building a 32-bit kernel. If we're building

srcpkgs/linux4.19/patches/ppcle-ll-compat-sys.patch

@@ -0,0 +1,107 @@
+From 98014e4b27063ed74313878233e91b7b52b2a031 Mon Sep 17 00:00:00 2001
+From: Will Springer <skirmisher@protonmail.com>
+Date: Tue, 9 Jun 2020 02:11:36 -0700
+Subject: [PATCH] powerpc/compat32: swap hi/lo parts of 64-bit syscall args on
+ 32LE
+
+This allows compat_sys calls with 64-bit args to function correctly
+when called by ppcle userlands on ppc64le.
+
+Tested with `file /bin/bash` (pread64) and `truncate -s 5G test` (ftruncate64).
+---
+ arch/powerpc/kernel/sys_ppc32.c | 49 +++++++++++++++++++--------------
+ 1 file changed, 28 insertions(+), 21 deletions(-)
+
+diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
+index d36c6391eaf5..16ff0399a257 100644
+--- a/arch/powerpc/kernel/sys_ppc32.c
++++ b/arch/powerpc/kernel/sys_ppc32.c
+@@ -59,57 +59,64 @@ unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
+ /* 
+  * long long munging:
+  * The 32 bit ABI passes long longs in an odd even register pair.
++ * High and low parts are swapped depending on endian mode,
++ * so define a macro (similar to mips linux32) to handle that.
+  */
++#ifdef __LITTLE_ENDIAN__
++#define merge_64(low, high) ((u64)high << 32) | low
++#else
++#define merge_64(high, low) ((u64)high << 32) | low
++#endif
+ 
+ compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
+-			     u32 reg6, u32 poshi, u32 poslo)
++			     u32 reg6, u32 pos1, u32 pos2)
+ {
+-	return ksys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
++	return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
+ }
+ 
+ compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
+-			      u32 reg6, u32 poshi, u32 poslo)
++			      u32 reg6, u32 pos1, u32 pos2)
+ {
+-	return ksys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
++	return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
+ }
+ 
+-compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
++compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count)
+ {
+-	return ksys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
++	return ksys_readahead(fd, merge_64(offset1, offset2), count);
+ }
+ 
+ asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
+-				unsigned long high, unsigned long low)
++				unsigned long len1, unsigned long len2)
+ {
+-	return ksys_truncate(path, (high << 32) | low);
++	return ksys_truncate(path, merge_64(len1, len2));
+ }
+ 
+-asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
+-				     u32 lenhi, u32 lenlo)
++asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2,
++				     u32 len1, u32 len2)
+ {
+-	return ksys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
+-			     ((loff_t)lenhi << 32) | lenlo);
++	return ksys_fallocate(fd, mode, ((loff_t)offset1 << 32) | offset2,
++			     merge_64(len1, len2));
+ }
+ 
+-asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
+-				 unsigned long low)
++asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1,
++				 unsigned long len2)
+ {
+-	return ksys_ftruncate(fd, (high << 32) | low);
++	return ksys_ftruncate(fd, merge_64(len1, len2));
+ }
+ 
+-long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
++long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
+ 		     size_t len, int advice)
+ {
+-	return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low, len,
++	return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
+ 				 advice);
+ }
+ 
+ asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
+-				   unsigned offset_hi, unsigned offset_lo,
+-				   unsigned nbytes_hi, unsigned nbytes_lo)
++				   unsigned offset1, unsigned offset2,
++				   unsigned nbytes1, unsigned nbytes2)
+ {
+-	loff_t offset = ((loff_t)offset_hi << 32) | offset_lo;
+-	loff_t nbytes = ((loff_t)nbytes_hi << 32) | nbytes_lo;
++	loff_t offset = merge_64(offset1, offset2);
++	loff_t nbytes = merge_64(nbytes1, nbytes2);
+ 
+ 	return ksys_sync_file_range(fd, offset, nbytes, flags);
+ }
+-- 
+2.26.2
+