1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2
3 /* TOC (Transfer of Control) handler. */
4
5 .level 1.1
6
7 #include <asm/assembly.h>
8 #include <linux/threads.h>
9 #include <linux/linkage.h>
10
11 .text
12 .import toc_intr,code
13 .import toc_stack,data
14 .align 16
15 ENTRY_CFI(toc_handler)
16 load32 PA(toc_stack),%sp
17
18 #ifdef CONFIG_SMP
19 /* get per-cpu toc_stack address. */
20 mfctl %cr30, %r1
21 tophys %r1,%r2 /* tas
22 LDREG TASK_TI_CPU(%r2),%r4 /* cpu
23 load32 PA(__per_cpu_offset),%r1
24 LDREGX %r4(%r1),%r4
25 add %r4,%sp,%sp
26 #endif
27
28 /*
29 * setup pt_regs on stack and save the
30 * floating point registers. PIM_TOC d
31 * save fp registers, so we're doing i
32 */
33 copy %sp,%arg0
34 ldo PT_SZ_ALGN(%sp), %sp
35
36 /* clear pt_regs */
37 copy %arg0,%r1
38 0: cmpb,<<,n %r1,%sp,0b
39 stw,ma %r0,4(%r1)
40
41 ldo PT_FR0(%arg0),%r25
42 save_fp %r25
43
44 /* go virtual */
45 load32 PA(swapper_pg_dir),%r4
46 mtctl %r4,%cr24
47 mtctl %r4,%cr25
48
49 /* Clear sr4-sr7 */
50 mtsp %r0, %sr4
51 mtsp %r0, %sr5
52 mtsp %r0, %sr6
53 mtsp %r0, %sr7
54
55 tovirt_r1 %sp
56 tovirt_r1 %arg0
57 virt_map
58
59 loadgp
60
61 #ifdef CONFIG_64BIT
62 ldo -16(%sp),%r29
63 #endif
64 load32 toc_intr,%r1
65 be 0(%sr7,%r1)
66 nop
67 ENDPROC_CFI(toc_handler)
68
69 /*
70 * keep this checksum here, as it is p
71 * spanned by toc_handler_size (all wo
72 * added in PDC and the sum must equal
73 */
74 SYM_DATA(toc_handler_csum, .long 0)
75 SYM_DATA(toc_handler_size, .long . - toc_handl
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