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xtensa: get rid of stack frame in coprocessor_flush 

coprocessor_flush is an ordinary function, it can use all registers.
Don't reserve stack frame for it and use a7 to preserve a0 around the
context saving call.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2022-04-18 00:14:00 -07:00
parent e45d4bfbeb
commit f29cab2906
1 changed files with 5 additions and 6 deletions
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11
arch/xtensa/kernel/coprocessor.S
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@ -216,10 +216,8 @@ ENDPROC(fast_coprocessor)
ENTRY(coprocessor_flush) ENTRY(coprocessor_flush)
/* reserve 4 bytes on stack to save a0 */ abi_entry_default
abi_entry(4)
s32i a0, a1, 0
movi a4, .Lcp_regs_jump_table movi a4, .Lcp_regs_jump_table
addx8 a4, a3, a4 addx8 a4, a3, a4
addx4 a3, a3, a4 addx4 a3, a3, a4
@ -227,10 +225,11 @@ ENTRY(coprocessor_flush)
beqz a4, 1f beqz a4, 1f
l32i a3, a3, CP_REGS_TAB_OFFSET l32i a3, a3, CP_REGS_TAB_OFFSET
add a2, a2, a3 add a2, a2, a3
mov a7, a0
callx0 a4 callx0 a4
1: l32i a0, a1, 0 mov a0, a7
1:
abi_ret(4) abi_ret_default
ENDPROC(coprocessor_flush) ENDPROC(coprocessor_flush)