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memmove may be called from module code copy_pages(btrfs), and it may
call memcpy, which may call back to C code, so it needs to use
_GLOBAL_TOC to set up r2 correctly.
This fixes following error when I tried to boot an le guest:
Vector: 300 (Data Access) at [c000000073f97210]
pc: c000000000015004: enable_kernel_altivec+0x24/0x80
lr: c000000000058fbc: enter_vmx_copy+0x3c/0x60
sp: c000000073f97490
msr: 8000000002009033
dar: d000000001d50170
dsisr: 40000000
current = 0xc0000000734c0000
paca = 0xc00000000fff0000 softe: 0 irq_happened: 0x01
pid = 815, comm = mktemp
enter ? for help
[c000000073f974f0] c000000000058fbc enter_vmx_copy+0x3c/0x60
[c000000073f97510] c000000000057d34 memcpy_power7+0x274/0x840
[c000000073f97610] d000000001c3179c copy_pages+0xfc/0x110 [btrfs]
[c000000073f97660] d000000001c3c248 memcpy_extent_buffer+0xe8/0x160 [btrfs]
[c000000073f97700] d000000001be4be8 setup_items_for_insert+0x208/0x4a0 [btrfs]
[c000000073f97820] d000000001be50b4 btrfs_insert_empty_items+0xf4/0x140 [btrfs]
[c000000073f97890] d000000001bfed30 insert_with_overflow+0x70/0x180 [btrfs]
[c000000073f97900] d000000001bff174 btrfs_insert_dir_item+0x114/0x2f0 [btrfs]
[c000000073f979a0] d000000001c1f92c btrfs_add_link+0x10c/0x370 [btrfs]
[c000000073f97a40] d000000001c20e94 btrfs_create+0x204/0x270 [btrfs]
[c000000073f97b00] c00000000026d438 vfs_create+0x178/0x210
[c000000073f97b50] c000000000270a70 do_last+0x9f0/0xe90
[c000000073f97c20] c000000000271010 path_openat+0x100/0x810
[c000000073f97ce0] c000000000272ea8 do_filp_open+0x58/0xd0
[c000000073f97dc0] c00000000025ade8 do_sys_open+0x1b8/0x300
[c000000073f97e30] c00000000000a008 syscall_exit+0x0/0x7c
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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binutils is smart enough to know that a branch to a function
descriptor is actually a branch to the functions text address.
Alan tells me that binutils has been doing this for 9 years.
Signed-off-by: Anton Blanchard <anton@samba.org>
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Remove CONFIG_POWER4_ONLY, the option is badly named and only does two
things:
- It wraps the MMU segment table code. With feature fixups there is
little downside to compiling this in.
- It uses the newer mtocrf instruction in various assembly functions.
Instead of making this a compile option just do it at runtime via
a feature fixup.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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mtocrf is a faster single-field mtcrf (move to condition register
fields) instruction available in POWER4 and later processors. It can
make quite a difference in performance on some implementations, so use
it for CONFIG_POWER4_ONLY builds.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This doesn't change any code, just renames things so we consistently
have foo_32.c and foo_64.c where we have separate 32- and 64-bit
versions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
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