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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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dab3b8f4fd
Use helper macros to access global variables, and place them in .data sections rather than in .toc. Putting addresses in TOC is not required because the kernel is linked with a single TOC. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220926034057.2360083-3-npiggin@gmail.com
47 lines
814 B
ArmAsm
47 lines
814 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <asm/ppc_asm.h>
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#include <asm/asm-compat.h>
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/* unsigned long xmon_mfspr(sprn, default_value) */
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_GLOBAL(xmon_mfspr)
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LOAD_REG_ADDR(r5, .Lmfspr_table)
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b xmon_mxspr
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/* void xmon_mtspr(sprn, new_value) */
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_GLOBAL(xmon_mtspr)
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LOAD_REG_ADDR(r5, .Lmtspr_table)
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b xmon_mxspr
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/*
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* r3 = sprn
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* r4 = default or new value
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* r5 = table base
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*/
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xmon_mxspr:
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/*
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* To index into the table of mxsprs we need:
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* i = (sprn & 0x3ff) * 8
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* or using rwlinm:
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* i = (sprn << 3) & (0x3ff << 3)
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*/
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rlwinm r3, r3, 3, 0x3ff << 3
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add r5, r5, r3
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mtctr r5
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mr r3, r4 /* put default_value in r3 for mfspr */
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bctr
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.Lmfspr_table:
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spr = 0
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.rept 1024
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mfspr r3, spr
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blr
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spr = spr + 1
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.endr
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.Lmtspr_table:
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spr = 0
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.rept 1024
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mtspr spr, r4
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blr
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spr = spr + 1
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.endr
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