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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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8
arch/mips/include/uapi/asm/sigcontext.h
View file

@ -12,6 +12,10 @@
#include <linux/types.h>
#include <asm/sgidefs.h>
/* Bits which may be set in sc_used_math */
#define USEDMATH_FP (1 << 0)
#define USEDMATH_MSA (1 << 1)
#if _MIPS_SIM == _MIPS_SIM_ABI32
/*
@ -37,6 +41,8 @@ struct sigcontext {
unsigned long sc_lo2;
unsigned long sc_hi3;
unsigned long sc_lo3;
unsigned long long sc_msaregs[32]; /* Most significant 64 bits */
unsigned long sc_msa_csr;
};
#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
@ -70,6 +76,8 @@ struct sigcontext {
__u32 sc_used_math;
__u32 sc_dsp;
__u32 sc_reserved;
__u64 sc_msaregs[32];
__u32 sc_msa_csr;
};