projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| b4b8664d AV |
2 | #ifndef __ASM_ASM_UACCESS_H |
| 3 | #define __ASM_ASM_UACCESS_H | |
| 4 | ||
| 5 | #include <asm/alternative.h> | |
| 6 | #include <asm/kernel-pgtable.h> | |
| 7 | #include <asm/sysreg.h> | |
| 8 | #include <asm/assembler.h> | |
| 9 | ||
| 10 | /* | |
| 11 | * User access enabling/disabling macros. | |
| 12 | */ | |
| 13 | #ifdef CONFIG_ARM64_SW_TTBR0_PAN | |
| 14 | .macro __uaccess_ttbr0_disable, tmp1 | |
| 15 | mrs \tmp1, ttbr1_el1 // swapper_pg_dir | |
| 16 | add \tmp1, \tmp1, #SWAPPER_DIR_SIZE // reserved_ttbr0 at the end of swapper_pg_dir | |
| 17 | msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1 | |
| 18 | isb | |
| 19 | .endm | |
| 20 | ||
| 21 | .macro __uaccess_ttbr0_enable, tmp1 | |
| 22 | get_thread_info \tmp1 | |
| 23 | ldr \tmp1, [\tmp1, #TSK_TI_TTBR0] // load saved TTBR0_EL1 | |
| 24 | msr ttbr0_el1, \tmp1 // set the non-PAN TTBR0_EL1 | |
| 25 | isb | |
| 26 | .endm | |
| 27 | ||
| 28 | .macro uaccess_ttbr0_disable, tmp1 | |
| 29 | alternative_if_not ARM64_HAS_PAN | |
| 30 | __uaccess_ttbr0_disable \tmp1 | |
| 31 | alternative_else_nop_endif | |
| 32 | .endm | |
| 33 | ||
| 34 | .macro uaccess_ttbr0_enable, tmp1, tmp2 | |
| 35 | alternative_if_not ARM64_HAS_PAN | |
| 36 | save_and_disable_irq \tmp2 // avoid preemption | |
| 37 | __uaccess_ttbr0_enable \tmp1 | |
| 38 | restore_irq \tmp2 | |
| 39 | alternative_else_nop_endif | |
| 40 | .endm | |
| 41 | #else | |
| 42 | .macro uaccess_ttbr0_disable, tmp1 | |
| 43 | .endm | |
| 44 | ||
| 45 | .macro uaccess_ttbr0_enable, tmp1, tmp2 | |
| 46 | .endm | |
| 47 | #endif | |
| 48 | ||
| 49 | /* | |
| 50 | * These macros are no-ops when UAO is present. | |
| 51 | */ | |
| 52 | .macro uaccess_disable_not_uao, tmp1 | |
| 53 | uaccess_ttbr0_disable \tmp1 | |
| 54 | alternative_if ARM64_ALT_PAN_NOT_UAO | |
| 55 | SET_PSTATE_PAN(1) | |
| 56 | alternative_else_nop_endif | |
| 57 | .endm | |
| 58 | ||
| 59 | .macro uaccess_enable_not_uao, tmp1, tmp2 | |
| 60 | uaccess_ttbr0_enable \tmp1, \tmp2 | |
| 61 | alternative_if ARM64_ALT_PAN_NOT_UAO | |
| 62 | SET_PSTATE_PAN(0) | |
| 63 | alternative_else_nop_endif | |
| 64 | .endm | |
| 65 | ||
| 276e9327 KM |
66 | /* |
| 67 | * Remove the address tag from a virtual address, if present. | |
| 68 | */ | |
| 69 | .macro clear_address_tag, dst, addr | |
| 70 | tst \addr, #(1 << 55) | |
| 71 | bic \dst, \addr, #(0xff << 56) | |
| 72 | csel \dst, \dst, \addr, eq | |
| 73 | .endm | |
| 74 | ||
| b4b8664d | 75 | #endif |