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Diffstat (limited to 'roms/skiboot/include/asm-utils.h')
| -rw-r--r-- | roms/skiboot/include/asm-utils.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/roms/skiboot/include/asm-utils.h b/roms/skiboot/include/asm-utils.h new file mode 100644 index 000000000..18325a8b3 --- /dev/null +++ b/roms/skiboot/include/asm-utils.h @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later +/* Copyright 2013-2019 IBM Corp. */ + +#ifndef __ASM_UTILS_H +#define __ASM_UTILS_H + +/* + * Do NOT use the immediate load helpers with symbols + * only with constants. Symbols will _not_ be resolved + * by the linker since we are building -pie, and will + * instead generate relocs of a type our little built-in + * relocator can't handle + */ + +/* Load an immediate 64-bit value into a register */ +#define LOAD_IMM64(r, e) \ + lis r,(e)@highest; \ + ori r,r,(e)@higher; \ + rldicr r,r, 32, 31; \ + oris r,r, (e)@h; \ + ori r,r, (e)@l; + +/* Load an immediate 32-bit value into a register */ +#define LOAD_IMM32(r, e) \ + lis r,(e)@h; \ + ori r,r,(e)@l; + +/* Load an address via the TOC */ +#define LOAD_ADDR_FROM_TOC(r, e) ld r,e@got(%r2) + +/* This must preserve LR, may only clobber r11-r12, so can't use Linux kernel's + * FIXUP_ENDIAN */ +#define SWITCH_ENDIAN \ + .long 0xa600607d; /* mfmsr r11 */ \ + .long 0x01006b69; /* xori r11,r11,1 */ \ + .long 0xa64b7b7d; /* mthsrr1 r11 */ \ + .long 0xa602687d; /* mflr r11 */ \ + .long 0x05009f42; /* bcl 20,31,$+4 */ \ + .long 0xa602887d; /* mflr r12 */ \ + .long 0x14008c39; /* addi r12,r12,20 */ \ + .long 0xa64b9a7d; /* mthsrr0 r12 */ \ + .long 0xa603687d; /* mtlr r11 */ \ + .long 0x2402004c /* hrfid */ + +#define FIXUP_ENDIAN \ + tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \ + b 191f; /* Skip trampoline if endian is good */ \ + SWITCH_ENDIAN; /* Do the switch */ \ +191: + +#if HAVE_BIG_ENDIAN +#define OPAL_ENTRY_TO_SKIBOOT_ENDIAN +#else +#define OPAL_ENTRY_TO_SKIBOOT_ENDIAN SWITCH_ENDIAN +#endif + +#endif /* __ASM_UTILS_H */ |