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.globl sparc64_of_client_interface, client_tba
/*
* SAVE_WINDOW_STATE and RESTORE_WINDOW_STATE are used to ensure
* that the CPU window state is preserved across CIF calls. This is
* to workaround a *BSD restriction that window fill/spill traps must
* be minimised during trap table takeover, and likely emulates the
* behaviour of OBP.
*/
#define SAVE_WINDOW_STATE(type) \
setx client_window, %g6, %g1; \
rdpr %cwp, %g7; \
stx %g7, [%g1]; \
rdpr %cansave, %g7; \
stx %g7, [%g1 + 0x8]; \
rdpr %canrestore, %g7; \
stx %g7, [%g1 + 0x10]; \
rdpr %otherwin, %g7; \
stx %g7, [%g1 + 0x18]; \
rdpr %wstate, %g7; \
stx %g7, [%g1 + 0x20]; \
rdpr %cleanwin, %g7; \
stx %g7, [%g1 + 0x28]; \
\
stx %o0, [%g1 + 0x30]; \
stx %o1, [%g1 + 0x38]; \
stx %o2, [%g1 + 0x40]; \
stx %o3, [%g1 + 0x48]; \
stx %o4, [%g1 + 0x50]; \
stx %o5, [%g1 + 0x58]; \
stx %o6, [%g1 + 0x60]; \
stx %o7, [%g1 + 0x68]; \
\
rdpr %pstate, %g7; \
stx %g7, [%g1 + 0x70]; \
rd %y, %g7; \
stx %g7, [%g1 + 0x78]; \
rd %fprs, %g7; \
stx %g7, [%g1 + 0x80]; \
\
/* Now iterate through all of the windows saving all l and i registers */ \
add %g1, 0x90, %g5; \
\
/* Get the number of windows in %g6 */ \
rdpr %ver, %g6; \
and %g6, 0xf, %g6; \
inc %g6; \
\
save_cpu_window_##type: \
deccc %g6; \
wrpr %g6, %cwp; \
stx %l0, [%g5]; \
stx %l1, [%g5 + 0x8]; \
stx %l2, [%g5 + 0x10]; \
stx %l3, [%g5 + 0x18]; \
stx %l4, [%g5 + 0x20]; \
stx %l5, [%g5 + 0x28]; \
stx %l6, [%g5 + 0x30]; \
stx %l7, [%g5 + 0x38]; \
stx %i0, [%g5 + 0x40]; \
stx %i1, [%g5 + 0x48]; \
stx %i2, [%g5 + 0x50]; \
stx %i3, [%g5 + 0x58]; \
stx %i4, [%g5 + 0x60]; \
stx %i5, [%g5 + 0x68]; \
stx %i6, [%g5 + 0x70]; \
stx %i7, [%g5 + 0x78]; \
bne save_cpu_window_##type; \
add %g5, 0x80, %g5; \
\
/* For 8 windows with 16 registers to save in the window, memory required \
is 16*8*8 = 0x400 bytes */ \
\
/* Now we should be in window 0 so update the other window registers */ \
rdpr %ver, %g6; \
and %g6, 0xf, %g6; \
dec %g6; \
wrpr %g6, %cansave; \
\
wrpr %g0, %cleanwin; \
wrpr %g0, %canrestore; \
wrpr %g0, %otherwin;
#define RESTORE_WINDOW_STATE(type) \
setx client_window, %g6, %g1; \
\
/* Get the number of windows in %g6 */ \
rdpr %ver, %g6; \
and %g6, 0xf, %g6; \
inc %g6; \
\
/* Now iterate through all of the windows restoring all l and i registers */ \
add %g1, 0x90, %g5; \
\
restore_cpu_window_##type: \
deccc %g6; \
wrpr %g6, %cwp; \
ldx [%g5], %l0; \
ldx [%g5 + 0x8], %l1; \
ldx [%g5 + 0x10], %l2; \
ldx [%g5 + 0x18], %l3; \
ldx [%g5 + 0x20], %l4; \
ldx [%g5 + 0x28], %l5; \
ldx [%g5 + 0x30], %l6; \
ldx [%g5 + 0x38], %l7; \
ldx [%g5 + 0x40], %i0; \
ldx [%g5 + 0x48], %i1; \
ldx [%g5 + 0x50], %i2; \
ldx [%g5 + 0x58], %i3; \
ldx [%g5 + 0x60], %i4; \
ldx [%g5 + 0x68], %i5; \
ldx [%g5 + 0x70], %i6; \
ldx [%g5 + 0x78], %i7; \
bne restore_cpu_window_##type; \
add %g5, 0x80, %g5; \
\
/* Restore the window registers to their original value */ \
ldx [%g1], %g7; \
wrpr %g7, %cwp; \
ldx [%g1 + 0x8], %g7; \
wrpr %g7, %cansave; \
ldx [%g1 + 0x10], %g7; \
wrpr %g7, %canrestore; \
ldx [%g1 + 0x18], %g7; \
wrpr %g7, %otherwin; \
ldx [%g1 + 0x20], %g7; \
wrpr %g7, %wstate; \
ldx [%g1 + 0x28], %g7; \
wrpr %g7, %cleanwin; \
\
ldx [%g1 + 0x30], %o0; \
ldx [%g1 + 0x38], %o1; \
ldx [%g1 + 0x40], %o2; \
ldx [%g1 + 0x48], %o3; \
ldx [%g1 + 0x50], %o4; \
ldx [%g1 + 0x58], %o5; \
ldx [%g1 + 0x60], %o6; \
ldx [%g1 + 0x68], %o7; \
\
ldx [%g1 + 0x70], %g7; \
wrpr %g7, %pstate; \
ldx [%g1 + 0x78], %g7; \
wr %g7, 0, %y; \
ldx [%g1 + 0x80], %g7; \
wr %g7, 0, %fprs
.data
.align 8
.skip 16384
openbios_stack:
client_stack:
.xword 0
client_tba:
.xword 0
client_window:
.skip 2048
.text
.align 4
.register %g2, #scratch
.register %g3, #scratch
.register %g6, #scratch
.register %g7, #scratch
/*
make some more space on stack since linux kernel only provides 128 bytes
without memory to spill registers (used by gcc in -O0 mode)
*/
sparc64_of_client_interface:
/* Save globals on callers stack */
add %sp, -56, %sp
stx %g1, [%sp + 2047 + 0]
stx %g2, [%sp + 2047 + 8]
stx %g3, [%sp + 2047 + 16]
stx %g4, [%sp + 2047 + 24]
stx %g5, [%sp + 2047 + 32]
stx %g6, [%sp + 2047 + 40]
stx %g7, [%sp + 2047 + 48]
/* Save client trap table */
setx client_tba, %g6, %g7
rdpr %tba, %g6
stx %g6, [%g7]
/* Save existing stack */
setx client_stack, %g6, %g7
stx %sp, [%g7]
/* Save windows */
SAVE_WINDOW_STATE(cif)
/* Move to OpenBIOS stack */
setx openbios_stack - 2047 - 192, %g6, %g7
mov %g7, %sp
/* Call client inteface */
call of_client_interface
ldx [%g1 + 0x30], %o0
setx client_window, %g6, %g1
stx %o0, [%g1 + 0x30]
/* Restore windows */
RESTORE_WINDOW_STATE(cif)
/* Restore stack */
setx client_stack, %g6, %g7
ldx [%g7], %sp
/* Restore client trap table */
setx client_tba, %g6, %g7
ldx [%g7], %g6
wrpr %g6, %tba
/* Restore globals */
ldx [%sp + 2047 + 0], %g1
ldx [%sp + 2047 + 8], %g2
ldx [%sp + 2047 + 16], %g3
ldx [%sp + 2047 + 24], %g4
ldx [%sp + 2047 + 32], %g5
ldx [%sp + 2047 + 40], %g6
ldx [%sp + 2047 + 48], %g7
add %sp, 56, %sp
jmp %o7+8
nop
|
