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powerpc: Keep track of emulated instructions

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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>
This commit is contained in:
Geert Uytterhoeven
2009-05-18 02:10:05 +00:00
committed by Benjamin Herrenschmidt
parent f312deb4cd
commit 80947e7c99
4 changed files with 196 additions and 6 deletions
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20
arch/powerpc/kernel/align.c
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@@ -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