path: root/tools/testing/selftests/powerpc/include
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authorBreno Leitao <leitao@debian.org>2018-10-31 11:38:20 -0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-11-25 17:11:21 +1100
commit5249497a7bb6334fcc128588d6a7e1e21786515a (patch)
tree04e8d1ab64c3680fa060eb3d03cd11eac4f661dd /tools/testing/selftests/powerpc/include
parentpowerpc/mm: Remove extern from function definition (diff)
selftests/powerpc: Allocate base registers
Some ptrace selftests are passing input operands using a constraint that can allocate any register for the operand, and using these registers on load/store operations. If the register allocated by the compiler happens to be zero (r0), it might cause an invalid memory address access, since load and store operations consider the content of 0x0 address if the base register is r0, instead of the content of the r0 register. For example: r1 := 0xdeadbeef r0 := 0xdeadbeef ld r2, 0(1) /* will load into r2 the content of r1 address */ ld r2, 0(0) /* will load into r2 the content of 0x0 */ In order to avoid this possible problem, the inline assembly constraint should be aware that these registers will be used as a base register, thus, r0 should not be allocated. Other than that, this patch removes inline assembly operands that are not used by the tests. Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc/include')
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