3 TRAP ta 0; nop; nop; nop;
5 /* Software trap. Treat as BAD_TRAP for the time being... */
6 #define SOFT_TRAP TRAP(_hwerr)
8 #define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
11 /* All traps low-level code here must end with this macro. */
12 #define RESTORE_ALL b ret_trap_entry; clr %l6;
14 #define WRITE_PAUSE nop;nop;nop
18 ARGPUSH = (WINDOWSIZE + 4)
19 MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
21 /* Number of register windows */
22 #ifndef CONFIG_SYS_SPARC_NWINDOWS
23 #error Must define number of SPARC register windows, default is 8
27 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
29 .section ".start", "ax"
32 #define BAD_TRAP ta 0; nop; nop; nop;
34 /* Software trap. Treat as BAD_TRAP for the time being... */
35 #define SOFT_TRAP TRAP(_hwerr)
37 #define PSR_INIT 0x1FC0 /* Disable traps, set s and ps */
40 /* All traps low-level code here must end with this macro. */
41 #define RESTORE_ALL b ret_trap_entry; clr %l6;
43 #define WRITE_PAUSE nop;nop;nop
47 ARGPUSH = (WINDOWSIZE + 4)
48 MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
50 /* Number of register windows */
51 #ifndef CONFIG_SYS_SPARC_NWINDOWS
52 #error Must define number of SPARC register windows, default is 8
56 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
58 .section ".start", "ax"
59 .globl _start, start, _trap_table
60 .globl _irq_entry, nmi_trap
69 TRAPR(_hardreset); ! 00 reset trap
70 BAD_TRAP; ! 01 instruction_access_exception
71 BAD_TRAP; ! 02 illegal_instruction
72 BAD_TRAP; ! 03 priveleged_instruction
73 BAD_TRAP; ! 04 fp_disabled
74 TRAP(_window_overflow); ! 05 window_overflow
75 TRAP(_window_underflow); ! 06 window_underflow
76 BAD_TRAP; ! 07 Memory Address Not Aligned
77 BAD_TRAP; ! 08 Floating Point Exception
78 BAD_TRAP; ! 09 Data Miss Exception
79 BAD_TRAP; ! 0a Tagged Instruction Ovrflw
80 BAD_TRAP; ! 0b Watchpoint Detected
86 TRAPI(1); ! 11 IRQ level 1
87 TRAPI(2); ! 12 IRQ level 2
88 TRAPI(3); ! 13 IRQ level 3
89 TRAPI(4); ! 14 IRQ level 4
90 TRAPI(5); ! 15 IRQ level 5
91 TRAPI(6); ! 16 IRQ level 6
92 TRAPI(7); ! 17 IRQ level 7
93 TRAPI(8); ! 18 IRQ level 8
94 TRAPI(9); ! 19 IRQ level 9
95 TRAPI(10); ! 1a IRQ level 10
96 TRAPI(11); ! 1b IRQ level 11
97 TRAPI(12); ! 1c IRQ level 12
98 TRAPI(13); ! 1d IRQ level 13
99 TRAPI(14); ! 1e IRQ level 14
100 TRAP(_nmi_trap); ! 1f IRQ level 15 /
101 ! NMI (non maskable interrupt)
102 BAD_TRAP; ! 20 r_register_access_error
103 BAD_TRAP; ! 21 instruction access error
106 BAD_TRAP; ! 24 co-processor disabled
107 BAD_TRAP; ! 25 uniplemented FLUSH
110 BAD_TRAP; ! 28 co-processor exception
111 BAD_TRAP; ! 29 data access error
112 BAD_TRAP; ! 2a division by zero
113 BAD_TRAP; ! 2b data store error
114 BAD_TRAP; ! 2c data access MMU miss
118 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 30-33
119 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 34-37
120 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 38-3b
121 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 3c-3f
122 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 40-43
123 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 44-47
124 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 48-4b
125 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 4c-4f
126 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 50-53
127 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 54-57
128 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 58-5b
129 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 5c-5f
131 /* implementaion dependent */
132 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 60-63
133 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 64-67
134 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 68-6b
135 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 6c-6f
136 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 70-73
137 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 74-77
138 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 78-7b
139 BAD_TRAP; BAD_TRAP; BAD_TRAP; BAD_TRAP; ! 7c-7f
141 /* Software traps, not handled */
142 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 80-83
143 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 84-87
144 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 88-8b
145 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 8c-8f
146 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 90-93
147 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 94-97
148 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 98-9b
149 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! 9c-9f
150 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a0-a3
151 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a4-a7
152 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! a8-ab
153 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ac-af
154 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b0-b3
155 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b4-b7
156 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! b8-bb
157 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! bc-bf
158 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c0-c3
159 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c4-c7
160 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! c8-cb
161 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! cc-cf
162 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d0-d3
163 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d4-d7
164 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! d8-db
165 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! dc-df
166 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e0-e3
167 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e4-e7
168 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! e8-eb
169 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! ec-ef
170 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f0-f3
171 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7
172 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb
173 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff
179 .extern leon3_snooping_avail
180 .globl version_string
182 .ascii U_BOOT_VERSION_STRING, "\0"
191 /* Enable I/D-Cache and Snooping */
232 set CONFIG_SYS_INIT_SP_OFFSET, %fp
240 /* un relocated start address of monitor */
241 #define TEXT_START _text
243 /* un relocated end address of monitor */
244 #define DATA_END __init_end
249 set CONFIG_SYS_RELOC_MONITOR_BASE,%g4
266 /* register g4 contain address to start
267 * This means that BSS must be directly after data and code segments
269 * g3 is length of bss = (__bss_end-__bss_start)
274 /* clear bss area (the relocated) */
279 clr %g1 /* std %g0 uses g0 and g1 */
280 /* clearing 16byte a time ==> linker script need to align to 16 byte offset */
289 /* add offsets to GOT table */
294 * new got offset = (old GOT-PTR (read with ld) -
295 * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) +
296 * Destination Address (from define)
298 set CONFIG_SYS_RELOC_MONITOR_BASE,%g2
304 sub %g2,%g1,%g2 ! prepare register with (new base address) -
307 ld [%g4],%l0 ! load old GOT-PTR
308 add %l0,%g2,%l0 ! increase with (new base address) -
317 set __prom_start, %g2
319 set CONFIG_SYS_PROM_OFFSET, %g4
328 bne prom_relocate_loop
331 /* Trap table has been moved, lets tell CPU about
332 * the new trap table address
335 set CONFIG_SYS_RELOC_MONITOR_BASE, %g2
341 /* If CACHE snooping is available in hardware the
342 * variable leon3_snooping_avail will be set to
346 sethi %hi(0x00800000), %o0
349 sethi %hi(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o1
350 st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE)+%o1]
354 /* Call relocated init functions */
357 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
364 set CONFIG_SYS_RELOC_MONITOR_BASE,%o2
370 dead: ta 0 ! if call returns...
373 /* Interrupt handler caller,
374 * reg L7: interrupt number
375 * reg L0: psr after interrupt
388 mov %l7, %o0 ! irq level
390 set (CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o2
393 add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr
394 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
395 wr %g2, PSR_ET, %psr ! keep ET up
400 !Window overflow trap handler.
401 .global _window_overflow
405 mov %wim, %l3 ! Calculate next WIM
408 sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4
411 save ! Get into window to be saved.
432 restore ! Go back to trap window.
434 jmp %l1 ! Re-execute save.
437 /* Window underflow trap handler. */
439 .global _window_underflow
443 mov %wim, %l3 ! Calculate next WIM
445 srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5
449 restore ! Two restores to get into the
450 restore ! window to restore
451 ld [%sp + 0], %l0; ! Restore window from the stack
467 save ! Get back to the trap window.
469 jmp %l1 ! Re-execute restore.
483 b _hwerr ! loop infinite
486 /* Registers to not touch at all. */
487 #define t_psr l0 /* Set by caller */
488 #define t_pc l1 /* Set by caller */
489 #define t_npc l2 /* Set by caller */
490 #define t_wim l3 /* Set by caller */
491 #define t_twinmask l4 /* Set at beginning of this entry routine. */
492 #define t_kstack l5 /* Set right before pt_regs frame is built */
493 #define t_retpc l6 /* If you change this, change winmacro.h header file */
494 #define t_systable l7 /* Never touch this, could be the syscall table ptr. */
495 #define curptr g6 /* Set after pt_regs frame is built */
498 /* build a pt_regs trap frame. */
499 sub %fp, (SF_REGS_SZ + PT_REGS_SZ), %t_kstack
500 PT_STORE_ALL(t_kstack, t_psr, t_pc, t_npc, g2)
502 /* See if we are in the trap window. */
504 sll %t_twinmask, %t_psr, %t_twinmask ! t_twinmask = (1 << psr)
505 andcc %t_twinmask, %t_wim, %g0
506 beq 1f ! in trap window, clean up
509 /*-------------------------------------------------
510 * Spill , adjust %wim and go.
512 srl %t_wim, 0x1, %g2 ! begin computation of new %wim
514 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
516 sll %t_wim, %g3, %t_wim ! NWINDOWS-1
520 save %g0, %g0, %g0 ! get in window to be saved
522 /* Set new %wim value */
525 /* Save the kernel window onto the corresponding stack. */
528 restore %g0, %g0, %g0
529 /*-------------------------------------------------*/
532 /* Trap from kernel with a window available.
535 jmpl %t_retpc + 0x8, %g0 ! return to caller
536 mov %t_kstack, %sp ! jump onto new stack
542 wr %t_psr, 0x0, %psr ! enable nesting again, clear ET
544 /* Will the rett land us in the invalid window? */
548 set CONFIG_SYS_SPARC_NWINDOWS, %g2 !NWINDOWS
554 be 1f ! Nope, just return from the trap
557 /* We have to grab a window before returning. */
558 set (CONFIG_SYS_SPARC_NWINDOWS-1), %g3 !NWINDOWS-1
566 /* Grrr, make sure we load from the right %sp... */
567 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
569 restore %g0, %g0, %g0
574 /* Reload the entire frame in case this is from a
575 * kernel system call or whatever...
578 PT_LOAD_ALL(sp, t_psr, t_pc, t_npc, g1)
588 /* This is called from relocated C-code.
589 * It resets the system by jumping to _start