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powerpc/lib/sstep: Fix build errors with newer binutils
Building tinyconfig with gcc (Debian 11.2.0-16) and assembler (Debian
2.37.90.20220207) the following build error shows up:
{standard input}: Assembler messages:
{standard input}:10576: Error: unrecognized opcode: `stbcx.'
{standard input}:10680: Error: unrecognized opcode: `lharx'
{standard input}:10694: Error: unrecognized opcode: `lbarx'
Rework to add assembler directives [1] around the instruction. The
problem with this might be that we can trick a power6 into
single-stepping through an stbcx. for instance, and it will execute that
in kernel mode.
[1] https://sourceware.org/binutils/docs/as/PowerPC_002dPseudo.html#PowerPC_002dPseudo
Fixes: 350779a29f
("powerpc: Handle most loads and stores in instruction emulation code")
Cc: stable@vger.kernel.org # v4.14+
Co-developed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220224162215.3406642-3-anders.roxell@linaro.org
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@ -1089,7 +1089,10 @@ NOKPROBE_SYMBOL(emulate_dcbz);
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#define __put_user_asmx(x, addr, err, op, cr) \
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__asm__ __volatile__( \
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".machine push\n" \
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".machine power8\n" \
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"1: " op " %2,0,%3\n" \
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".machine pop\n" \
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" mfcr %1\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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@ -1102,7 +1105,10 @@ NOKPROBE_SYMBOL(emulate_dcbz);
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#define __get_user_asmx(x, addr, err, op) \
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__asm__ __volatile__( \
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".machine push\n" \
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".machine power8\n" \
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"1: "op" %1,0,%2\n" \
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".machine pop\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: li %0,%3\n" \
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