97a6f43bb0
The asm version of the kernel mapping code works fine for creating a coarse grained identity map, but for mapping the kernel down to its exact boundaries with the right attributes, it is not suitable. This is why we create a preliminary RWX kernel mapping first, and then rebuild it from scratch later on. So let's reimplement this in C, in a way that will make it unnecessary to create the kernel page tables yet another time in paging_init(). Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-63-ardb+git@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
55 lines
1003 B
C
55 lines
1003 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SCS_H
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#define _ASM_SCS_H
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#ifdef __ASSEMBLY__
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#include <asm/asm-offsets.h>
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#include <asm/sysreg.h>
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#ifdef CONFIG_SHADOW_CALL_STACK
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scs_sp .req x18
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.macro scs_load_current
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get_current_task scs_sp
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ldr scs_sp, [scs_sp, #TSK_TI_SCS_SP]
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.endm
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.macro scs_save tsk
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str scs_sp, [\tsk, #TSK_TI_SCS_SP]
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.endm
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#else
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.macro scs_load_current
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.endm
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.macro scs_save tsk
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.endm
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#endif /* CONFIG_SHADOW_CALL_STACK */
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#else
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#include <linux/scs.h>
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#include <asm/cpufeature.h>
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#ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS
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static inline void dynamic_scs_init(void)
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{
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extern bool __pi_dynamic_scs_is_enabled;
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if (__pi_dynamic_scs_is_enabled) {
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pr_info("Enabling dynamic shadow call stack\n");
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static_branch_enable(&dynamic_scs_enabled);
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}
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}
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#else
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static inline void dynamic_scs_init(void) {}
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#endif
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int __pi_scs_patch(const u8 eh_frame[], int size);
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asmlinkage void __pi_scs_patch_vmlinux(void);
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#endif /* __ASSEMBLY __ */
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#endif /* _ASM_SCS_H */
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