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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
| commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
| tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/parisc/kernel/toc_asm.S | |
| parent | Initial commit. (diff) | |
| download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip | |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/kernel/toc_asm.S')
| -rw-r--r-- | arch/parisc/kernel/toc_asm.S | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/parisc/kernel/toc_asm.S b/arch/parisc/kernel/toc_asm.S new file mode 100644 index 0000000000..570f5cef52 --- /dev/null +++ b/arch/parisc/kernel/toc_asm.S @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +/* TOC (Transfer of Control) handler. */ + + .level 1.1 + +#include <asm/assembly.h> +#include <linux/threads.h> +#include <linux/linkage.h> + + .text + .import toc_intr,code + .import toc_stack,data + .align 16 +ENTRY_CFI(toc_handler) + load32 PA(toc_stack),%sp + +#ifdef CONFIG_SMP + /* get per-cpu toc_stack address. */ + mfctl %cr30, %r1 + tophys %r1,%r2 /* task_struct */ + LDREG TASK_TI_CPU(%r2),%r4 /* cpu */ + load32 PA(__per_cpu_offset),%r1 + LDREGX %r4(%r1),%r4 + add %r4,%sp,%sp +#endif + + /* + * setup pt_regs on stack and save the + * floating point registers. PIM_TOC doesn't + * save fp registers, so we're doing it here. + */ + copy %sp,%arg0 + ldo PT_SZ_ALGN(%sp), %sp + + /* clear pt_regs */ + copy %arg0,%r1 +0: cmpb,<<,n %r1,%sp,0b + stw,ma %r0,4(%r1) + + ldo PT_FR0(%arg0),%r25 + save_fp %r25 + + /* go virtual */ + load32 PA(swapper_pg_dir),%r4 + mtctl %r4,%cr24 + mtctl %r4,%cr25 + + /* Clear sr4-sr7 */ + mtsp %r0, %sr4 + mtsp %r0, %sr5 + mtsp %r0, %sr6 + mtsp %r0, %sr7 + + tovirt_r1 %sp + tovirt_r1 %arg0 + virt_map + + loadgp + +#ifdef CONFIG_64BIT + ldo -16(%sp),%r29 +#endif + load32 toc_intr,%r1 + be 0(%sr7,%r1) + nop +ENDPROC_CFI(toc_handler) + + /* + * keep this checksum here, as it is part of the toc_handler + * spanned by toc_handler_size (all words in toc_handler are + * added in PDC and the sum must equal to zero. + */ +SYM_DATA(toc_handler_csum, .long 0) +SYM_DATA(toc_handler_size, .long . - toc_handler) |