# # Copyright (C) 2005 Jakub Jermar # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # # - Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # - Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # - The name of the author may not be used to endorse or promote products # derived from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # #include /** * Both context_save_arch() and context_restore_arch() are * leaf-optimized procedures. This kind of optimization * is very important and prevents any implicit window * spill/fill/clean traps in these very core kernel * functions. */ .text .global context_save_arch .global context_restore_arch .macro CONTEXT_STORE r stx %sp, [\r + OFFSET_SP] stx %o7, [\r + OFFSET_PC] stx %i0, [\r + OFFSET_I0] stx %i1, [\r + OFFSET_I1] stx %i2, [\r + OFFSET_I2] stx %i3, [\r + OFFSET_I3] stx %i4, [\r + OFFSET_I4] stx %i5, [\r + OFFSET_I5] stx %fp, [\r + OFFSET_FP] stx %i7, [\r + OFFSET_I7] stx %l0, [\r + OFFSET_L0] stx %l1, [\r + OFFSET_L1] stx %l2, [\r + OFFSET_L2] stx %l3, [\r + OFFSET_L3] stx %l4, [\r + OFFSET_L4] stx %l5, [\r + OFFSET_L5] stx %l6, [\r + OFFSET_L6] stx %l7, [\r + OFFSET_L7] rdpr %cleanwin, %g1 stx %g1, [\r + OFFSET_CLEANWIN] .endm .macro CONTEXT_LOAD r ldx [\r + OFFSET_SP], %sp ldx [\r + OFFSET_PC], %o7 ldx [\r + OFFSET_I0], %i0 ldx [\r + OFFSET_I1], %i1 ldx [\r + OFFSET_I2], %i2 ldx [\r + OFFSET_I3], %i3 ldx [\r + OFFSET_I4], %i4 ldx [\r + OFFSET_I5], %i5 ldx [\r + OFFSET_FP], %fp ldx [\r + OFFSET_I7], %i7 ldx [\r + OFFSET_L0], %l0 ldx [\r + OFFSET_L1], %l1 ldx [\r + OFFSET_L2], %l2 ldx [\r + OFFSET_L3], %l3 ldx [\r + OFFSET_L4], %l4 ldx [\r + OFFSET_L5], %l5 ldx [\r + OFFSET_L6], %l6 ldx [\r + OFFSET_L7], %l7 ldx [\r + OFFSET_CLEANWIN], %g1 wrpr %g1, %g0, %cleanwin .endm context_save_arch: CONTEXT_STORE %o0 retl mov 1, %o0 ! context_save_arch returns 1 context_restore_arch: # # Flush all active windows. # This is essential, because CONTEXT_LOAD overwrites # %sp of CWP - 1 with the value written to %fp of CWP. # Flushing all active windows mitigates this problem # as CWP - 1 becomes the overlap window. # flushw CONTEXT_LOAD %o0 retl xor %o0, %o0, %o0 ! context_restore_arch returns 0