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| author |   Max Filippov <jcmvbkbc@gmail.com> | 2021-07-25 16:31:34 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2021-10-18 22:19:34 -0700 |
| commit | 61a6b91283b4c9e308fcf9377d3f0598ceccb252 (patch) | |
| tree | 8d96ceb3f4f4bbd4bf6deff7822814008e9459d0 /arch/xtensa/kernel/process.c | |
| parent | xtensa: don't use a12 in strncpy_user (diff) | |
| download | linux-dev-61a6b91283b4c9e308fcf9377d3f0598ceccb252.tar.xz linux-dev-61a6b91283b4c9e308fcf9377d3f0598ceccb252.zip | |
xtensa: don't use a12 in __xtensa_copy_user in call0 ABI
a12 is callee-saved register in xtensa call0 ABI, so a function must not
change it. The main unaligned copy loop of __xtensa_copy_user uses all
low-numbered registers, so a register must be spilled to avoid using a12
as a loop counter.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/process.c')
0 files changed, 0 insertions, 0 deletions