295 lines
6.8 KiB
ArmAsm
295 lines
6.8 KiB
ArmAsm
/* Overlay manager for SPU.
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Copyright 2006, 2007 Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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GLD is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GLD is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GLD; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/**
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* MFC DMA defn's.
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*/
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#define MFC_GET_CMD 0x40
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#define MFC_MAX_DMA_SIZE 0x4000
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#define MFC_TAG_UPDATE_ALL 2
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#define MFC_TAG_ID 0
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/**
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* Temporary register allocations.
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* These are saved/restored here.
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*/
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#define tab $75
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#define cgbits $75
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#define add64 $75
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#define ealo $75
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#define newmask $75
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#define tagstat $75
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#define bchn $75
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#define rv1 $75
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#define off $76
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#define off64 $76
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#define maxsize $76
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#define oldmask $76
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#define sz $76
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#define lnkr $76
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#define rv2 $76
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#define cur $77
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#define cmp $77
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#define buf $77
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#define genwi $77
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#define tagid $77
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#define cmd $77
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#define rv3 $77
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#define cgshuf $78
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#define vma $6
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#define map $7
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#define osize $7
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#define cmp2 $7
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#define ea64 $8
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#define retval $8
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#ifdef OVLY_IRQ_SAVE
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#define irqtmp $8
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#define irq_stat $9
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#endif
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.extern _ovly_table
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.extern _ovly_buf_table
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.text
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.align 4
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.type __rv_pattern, @object
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.size __rv_pattern, 16
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__rv_pattern:
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.word 0x00010203, 0x1c1d1e1f, 0x00010203, 0x10111213
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.type __cg_pattern, @object
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.size __cg_pattern, 16
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__cg_pattern:
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.word 0x04050607, 0x80808080, 0x80808080, 0x80808080
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/**
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* __ovly_return - stub for returning from overlay functions.
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*
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* inputs:
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* $lr link register
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*
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* outputs:
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* $78 old partition number, to be reloaded
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* $79 return address in old partion number
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*/
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.global __ovly_return
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.type __ovly_return, @function
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.word 0
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__ovly_return:
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shlqbyi $78, $lr, 4
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shlqbyi $79, $lr, 8
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biz $78, $79
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.size __ovly_return, . - __ovly_return
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/**
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* __ovly_load - copy an overlay partion to local store.
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*
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* inputs:
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* $78 partition number to be loaded.
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* $79 branch target in new partition.
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* $lr link register, containing return addr.
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*
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* outputs:
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* $lr new link register, returning through __ovly_return.
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*
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* Copy a new overlay partition into local store, or return
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* immediately if the partition is already resident.
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*/
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.global __ovly_load
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.type __ovly_load, @function
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__ovly_load:
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/* Save temporary registers to stack. */
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stqd $6, -16($sp)
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stqd $7, -32($sp)
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stqd $8, -48($sp)
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#ifdef OVLY_IRQ_SAVE
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/* Save irq state, then disable interrupts. */
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stqd $9, -64($sp)
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ila irqtmp, __ovly_irq_save
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rdch irq_stat, $SPU_RdMachStat
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bid irqtmp
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__ovly_irq_save:
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#endif
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/* Set branch hint to overlay target. */
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hbr __ovly_load_ret, $79
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/* Get caller's overlay index by back chaining through stack frames.
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* Loop until end of stack (back chain all-zeros) or
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* encountered a link register we set here. */
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lqd bchn, 0($sp)
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ila retval, __ovly_return
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__ovly_backchain_loop:
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lqd lnkr, 16(bchn)
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lqd bchn, 0(bchn)
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ceq cmp, lnkr, retval
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ceqi cmp2, bchn, 0
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or cmp, cmp, cmp2
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brz cmp, __ovly_backchain_loop
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/* If we reached the zero back-chain, then lnkr is bogus. Clear the
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* part of lnkr that we use later (slot 3). */
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rotqbyi cmp2, cmp2, 4
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andc lnkr, lnkr, cmp2
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/* Set lr = {__ovly_return, prev ovl ndx, caller return adr, callee ovl ndx}. */
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lqd rv1, (__rv_pattern-__ovly_return+4)(retval)
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shufb rv2, retval, lnkr, rv1
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shufb rv3, $lr, $78, rv1
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fsmbi rv1, 0xff
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selb rv2, rv2, rv3, rv1
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/* If we have a tail call from one overlay function to another overlay,
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then lr is already set up. Don't change it. */
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ceq rv1, $lr, retval
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fsmb rv1, rv1
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selb $lr, rv2, $lr, rv1
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/* Branch to $79 if non-overlay */
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brz $78, __ovly_load_restore
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/* Load values from _ovly_table[$78].
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* extern struct {
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* u32 vma;
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* u32 size;
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* u32 file_offset;
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* u32 buf;
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* } _ovly_table[];
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*/
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shli off, $78, 4
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ila tab, _ovly_table - 16
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lqx vma, tab, off
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rotqbyi buf, vma, 12
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/* Load values from _ovly_buf_table[buf].
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* extern struct {
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* u32 mapped;
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* } _ovly_buf_table[];
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*/
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ila tab, _ovly_buf_table
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ai off, buf, -1
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shli off, off, 2
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lqx map, tab, off
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rotqby cur, map, off
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/* Branch to $79 now if overlay is already mapped. */
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ceq cmp, $78, cur
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brnz cmp, __ovly_load_restore
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/* Marker for profiling code. If we get here, we are about to load
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* a new overlay.
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*/
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.global __ovly_load_event
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.type __ovly_load_event, @function
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__ovly_load_event:
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/* Set _ovly_buf_table[buf].mapped = $78. */
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cwx genwi, tab, off
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shufb map, $78, map, genwi
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stqx map, tab, off
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/* A new partition needs to be loaded. Prepare for DMA loop.
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* _EAR_ is the 64b base EA, filled in at run time by the
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* loader, and indicating the value for SPU executable image start.
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*/
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lqd cgshuf, (__cg_pattern-__ovly_return+4)(retval)
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rotqbyi osize, vma, 4
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rotqbyi sz, vma, 8
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lqa ea64, _EAR_
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__ovly_xfer_loop:
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/* 64b add to compute next ea64. */
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rotqmbyi off64, sz, -4
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cg cgbits, ea64, off64
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shufb add64, cgbits, cgbits, cgshuf
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addx add64, ea64, off64
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ori ea64, add64, 0
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/* Setup DMA parameters, then issue DMA request. */
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rotqbyi ealo, add64, 4
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ila maxsize, MFC_MAX_DMA_SIZE
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cgt cmp, osize, maxsize
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selb sz, osize, maxsize, cmp
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ila tagid, MFC_TAG_ID
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wrch $MFC_LSA, vma
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wrch $MFC_EAH, ea64
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wrch $MFC_EAL, ealo
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wrch $MFC_Size, sz
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wrch $MFC_TagId, tagid
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ila cmd, MFC_GET_CMD
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wrch $MFC_Cmd, cmd
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/* Increment vma, decrement size, branch back as needed. */
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a vma, vma, sz
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sf osize, sz, osize
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brnz osize, __ovly_xfer_loop
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/* Save app's tagmask, wait for DMA complete, restore mask. */
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rdch oldmask, $MFC_RdTagMask
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#if MFC_TAG_ID < 16
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ilh newmask, 1 << MFC_TAG_ID
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#else
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ilhu newmask, 1 << (MFC_TAG_ID - 16)
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#endif
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wrch $MFC_WrTagMask, newmask
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ila tagstat, MFC_TAG_UPDATE_ALL
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wrch $MFC_WrTagUpdate, tagstat
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rdch tagstat, $MFC_RdTagStat
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sync
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wrch $MFC_WrTagMask, oldmask
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.global _ovly_debug_event
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.type _ovly_debug_event, @function
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_ovly_debug_event:
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/* GDB inserts debugger trap here. */
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nop
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__ovly_load_restore:
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#ifdef OVLY_IRQ_SAVE
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/* Conditionally re-enable interrupts. */
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andi irq_stat, irq_stat, 1
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ila irqtmp, __ovly_irq_restore
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binze irq_stat, irqtmp
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__ovly_irq_restore:
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lqd $9, -64($sp)
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#endif
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/* Restore saved registers. */
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lqd $8, -48($sp)
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lqd $7, -32($sp)
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lqd $6, -16($sp)
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__ovly_load_ret:
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/* Branch to target address. */
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bi $79
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.size __ovly_load, . - __ovly_load
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