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MIPS: Save/restore MSA context around signals

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This patch extends sigcontext in order to hold the most significant 64
bits of each vector register in addition to the MSA control & status
register. The least significant 64 bits are already saved as the scalar
FP context. This makes things a little awkward since the least & most
significant 64 bits of each vector register are not contiguous in
memory. Thus the copy_u & insert instructions are used to transfer the
values of the most significant 64 bits via GP registers.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6533/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2014-02-13 11:27:42 +00:00
committed by Ralf Baechle
parent a8ad136789
commit eec43a224c
6 changed files with 357 additions and 16 deletions
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3
arch/mips/kernel/asm-offsets.c
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@@ -295,6 +295,7 @@ void output_sc_defines(void)
OFFSET(SC_LO2, sigcontext, sc_lo2);
OFFSET(SC_HI3, sigcontext, sc_hi3);
OFFSET(SC_LO3, sigcontext, sc_lo3);
OFFSET(SC_MSAREGS, sigcontext, sc_msaregs);
BLANK();
}
#endif
@@ -309,6 +310,7 @@ void output_sc_defines(void)
OFFSET(SC_MDLO, sigcontext, sc_mdlo);
OFFSET(SC_PC, sigcontext, sc_pc);
OFFSET(SC_FPC_CSR, sigcontext, sc_fpc_csr);
OFFSET(SC_MSAREGS, sigcontext, sc_msaregs);
BLANK();
}
#endif
@@ -320,6 +322,7 @@ void output_sc32_defines(void)
OFFSET(SC32_FPREGS, sigcontext32, sc_fpregs);
OFFSET(SC32_FPC_CSR, sigcontext32, sc_fpc_csr);
OFFSET(SC32_FPC_EIR, sigcontext32, sc_fpc_eir);
OFFSET(SC32_MSAREGS, sigcontext32, sc_msaregs);
BLANK();
}
#endif