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powerpc/signal: Use code patching instead of hardcoding

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Instead of hardcoding code modifications, use code patching functions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2018-11-09 17:33:28 +00:00
committed by Michael Ellerman
parent 002cdfc2c7
commit d16952a629
3 changed files with 11 additions and 9 deletions
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7
arch/powerpc/kernel/signal_64.c
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@@ -598,11 +598,12 @@ static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
long err = 0;
/* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */
err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
err |= __put_user(PPC_INST_ADDI | __PPC_RT(R1) | __PPC_RA(R1) |
(__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
/* li r0, __NR_[rt_]sigreturn| */
err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
err |= __put_user(PPC_INST_ADDI | (syscall & 0xffff), &tramp[1]);
/* sc */
err |= __put_user(0x44000002UL, &tramp[2]);
err |= __put_user(PPC_INST_SC, &tramp[2]);
/* Minimal traceback info */
for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)