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| author | Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> | 2009-05-18 04:10:05 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-21 07:44:26 +0200 |
| commit | 80947e7c99c29ce3a78bdc1933b310468455a82f (patch) | |
| tree | d0403ed66d03aa7f6498c65193e1f56def6af13f /arch/powerpc/kernel/align.c | |
| parent | powerpc/xmon: Add dl command to dump contents of __log_buf (diff) | |
| download | linux-80947e7c99c29ce3a78bdc1933b310468455a82f.tar.xz linux-80947e7c99c29ce3a78bdc1933b310468455a82f.zip | |
powerpc: Keep track of emulated instructions
If CONFIG_PPC_EMULATED_STATS is enabled, make available counters for the
various classes of emulated instructions under
/sys/kernel/debug/powerpc/emulated_instructions/ (assumed debugfs is mounted on
/sys/kernel/debug). Optionally (controlled by
/sys/kernel/debug/powerpc/emulated_instructions/do_warn), rate-limited warnings
can be printed to the console when instructions are emulated.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/align.c')
| -rw-r--r-- | arch/powerpc/kernel/align.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c index 5ffcfaa77d6a..a5b632e52fae 100644 --- a/arch/powerpc/kernel/align.c +++ b/arch/powerpc/kernel/align.c @@ -24,6 +24,7 @@ #include <asm/system.h> #include <asm/cache.h> #include <asm/cputable.h> +#include <asm/emulated_ops.h> struct aligninfo { unsigned char len; @@ -730,8 +731,10 @@ int fix_alignment(struct pt_regs *regs) areg = dsisr & 0x1f; /* register to update */ #ifdef CONFIG_SPE - if ((instr >> 26) == 0x4) + if ((instr >> 26) == 0x4) { + PPC_WARN_EMULATED(spe); return emulate_spe(regs, reg, instr); + } #endif instr = (dsisr >> 10) & 0x7f; @@ -783,23 +786,28 @@ int fix_alignment(struct pt_regs *regs) flags |= SPLT; nb = 8; } + PPC_WARN_EMULATED(vsx); return emulate_vsx(addr, reg, areg, regs, flags, nb); } #endif /* A size of 0 indicates an instruction we don't support, with * the exception of DCBZ which is handled as a special case here */ - if (instr == DCBZ) + if (instr == DCBZ) { + PPC_WARN_EMULATED(dcbz); return emulate_dcbz(regs, addr); + } if (unlikely(nb == 0)) return 0; /* Load/Store Multiple instructions are handled in their own * function */ - if (flags & M) + if (flags & M) { + PPC_WARN_EMULATED(multiple); return emulate_multiple(regs, addr, reg, nb, flags, instr, swiz); + } /* Verify the address of the operand */ if (unlikely(user_mode(regs) && @@ -816,8 +824,12 @@ int fix_alignment(struct pt_regs *regs) } /* Special case for 16-byte FP loads and stores */ - if (nb == 16) + if (nb == 16) { + PPC_WARN_EMULATED(fp_pair); return emulate_fp_pair(addr, reg, flags); + } + + PPC_WARN_EMULATED(unaligned); /* If we are loading, get the data from user space, else * get it from register values |