On Jun 2, 2010, at 6:29 AM, Paul Mackerras wrote: > This extends the emulate_step() function to handle a large proportion > of the Book I instructions implemented on current 64-bit server > processors. The aim is to handle all the load and store instructions > used in the kernel, plus all of the instructions that appear between > l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx > and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7). > > The new code can emulate user mode instructions, and checks the > effective address for a load or store if the saved state is for > user mode. It doesn't handle little-endian mode at present. > > For floating-point, Altivec/VMX and VSX instructions, it checks > that the saved MSR has the enable bit for the relevant facility > set, and if so, assumes that the FP/VMX/VSX registers contain > valid state, and does loads or stores directly to/from the > FP/VMX/VSX registers, using assembly helpers in ldstfp.S. > > Instructions supported now include: > * Loads and stores, including some but not all VMX and VSX instructions, > and lmw/stmw > * Atomic loads and stores (l[dw]arx, st[dw]cx.) > * Integer arithmetic instructions (add, subtract, multiply, divide, etc.) > * Compare instructions > * Rotate and mask instructions > * Shift instructions > * Logical instructions (and, or, xor, etc.) > * Condition register logical instructions > * mtcrf, cntlz[wd], exts[bhw] > * isync, sync, lwsync, ptesync, eieio > * Cache operations (dcbf, dcbst, dcbt, dcbtst) > > The overflow-checking arithmetic instructions are not included, but > they appear not to be ever used in C code. None of the floating > point, VMX or VSX computational instructions are included. > > This uses decimal values for the minor opcodes in the switch statements > because that is what appears in the Power ISA specification, thus it is > easier to check that they are correct if they are in decimal. > > Signed-off-by: Paul Mackerras <pau...@samba.org> > --- > arch/powerpc/lib/Makefile | 4 +- > arch/powerpc/lib/ldstfp.S | 207 ++++++ > arch/powerpc/lib/sstep.c | 1513 +++++++++++++++++++++++++++++++++++++++++++-- > 3 files changed, 1677 insertions(+), 47 deletions(-) > create mode 100644 arch/powerpc/lib/ldstfp.S
Why do we need to have emu support for all of these instructions? - k _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
