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powerpc: Put FP/VSX and VR state into structures

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This creates new 'thread_fp_state' and 'thread_vr_state' structures
to store FP/VSX state (including FPSCR) and Altivec/VSX state
(including VSCR), and uses them in the thread_struct.  In the
thread_fp_state, the FPRs and VSRs are represented as u64 rather
than double, since we rarely perform floating-point computations
on the values, and this will enable the structures to be used
in KVM code as well.  Similarly FPSCR is now a u64 rather than
a structure of two 32-bit values.

This takes the offsets out of the macros such as SAVE_32FPRS,
REST_32FPRS, etc.  This enables the same macros to be used for normal
and transactional state, enabling us to delete the transactional
versions of the macros.   This also removes the unused do_load_up_fpu
and do_load_up_altivec, which were in fact buggy since they didn't
create large enough stack frames to account for the fact that
load_up_fpu and load_up_altivec are not designed to be called from C
and assume that their caller's stack frame is an interrupt frame.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras
2013-09-10 20:20:42 +10:00
committed by Benjamin Herrenschmidt
parent 8e0a1611cb
commit de79f7b9f6
17 changed files with 200 additions and 358 deletions
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6
arch/powerpc/kernel/align.c
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@@ -660,7 +660,7 @@ static int emulate_vsx(unsigned char __user *addr, unsigned int reg,
if (reg < 32)
ptr = (char *) &current->thread.TS_FPR(reg);
else
ptr = (char *) &current->thread.vr[reg - 32];
ptr = (char *) &current->thread.vr_state.vr[reg - 32];
lptr = (unsigned long *) ptr;
@@ -897,7 +897,7 @@ int fix_alignment(struct pt_regs *regs)
return -EFAULT;
}
} else if (flags & F) {
data.dd = current->thread.TS_FPR(reg);
data.ll = current->thread.TS_FPR(reg);
if (flags & S) {
/* Single-precision FP store requires conversion... */
#ifdef CONFIG_PPC_FPU
@@ -975,7 +975,7 @@ int fix_alignment(struct pt_regs *regs)
if (unlikely(ret))
return -EFAULT;
} else if (flags & F)
current->thread.TS_FPR(reg) = data.dd;
current->thread.TS_FPR(reg) = data.ll;
else
regs->gpr[reg] = data.ll;