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zephyr/arch/arm64/core/offsets/offsets.c

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arch: arm64: Introduce ARM64 (AArch64) architecture Introduce the basic ARM64 architecture support. A new CONFIG_ARM64 symbol is introduced for the new architecture and new cmake / Kconfig files are added to switch between ARM and ARM64. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2019-11-11 00:17:19 +08:00
/*
* Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief ARM64 kernel structure member offset definition file
*
* This module is responsible for the generation of the absolute symbols whose
* value represents the member offsets for various ARM kernel structures.
*
* All of the absolute symbols defined by this module will be present in the
* final kernel ELF image (due to the linker's reference to the _OffsetAbsSyms
* symbol).
*
* INTERNAL
* It is NOT necessary to define the offset for every member of a structure.
* Typically, only those members that are accessed by assembly language routines
* are defined; however, it doesn't hurt to define all fields for the sake of
* completeness.
*/
arm: add include guard for offset files MISRA-C directive 4.10 requires that files being included must prevent itself from being included more than once. So add include guards to the offset files, even though they are C source files. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2020-07-22 05:00:14 +08:00
#ifndef _ARM_OFFSETS_INC_
#define _ARM_OFFSETS_INC_
arm/arm64: Make ARM64 a standalone architecture Split ARM and ARM64 architectures. Details: - CONFIG_ARM64 is decoupled from CONFIG_ARM (not a subset anymore) - Arch and include AArch64 files are in a dedicated directory (arch/arm64 and include/arch/arm64) - AArch64 boards and SoC are moved to soc/arm64 and boards/arm64 - AArch64-specific DTS files are moved to dts/arm64 - The A72 support for the bcm_vk/viper board is moved in the boards/bcm_vk/viper directory Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-03-25 18:56:15 +08:00
#include <gen_offset.h>
arch: arm64: Introduce ARM64 (AArch64) architecture Introduce the basic ARM64 architecture support. A new CONFIG_ARM64 symbol is introduced for the new architecture and new cmake / Kconfig files are added to switch between ARM and ARM64. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2019-11-11 00:17:19 +08:00
#include <kernel.h>
#include <kernel_arch_data.h>
#include <kernel_offsets.h>
arm64: implement exception depth count Add the exception depth count to tpidrro_el0 and make it available through the arch_exception_depth() accessor. The IN_EL0 flag is now updated unconditionally even if userspace is not configured. Doing otherwise made the code rather hairy and I doubt the overhead is measurable. Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
2021-04-13 12:42:00 +08:00
GEN_OFFSET_SYM(_thread_arch_t, exception_depth);
aarch64: Use absolute symbols for the callee saved registers Use GEN_OFFSET_SYM macro to genarate absolute symbols for the _callee_saved struct and use these new symbols in the assembly code. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2020-11-11 21:29:44 +08:00
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x19, x19_x20);
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x21, x21_x22);
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x23, x23_x24);
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x25, x25_x26);
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x27, x27_x28);
arm64: Rework stack usage The ARM64 port is currently using SP_EL0 for everything: kernel threads, user threads and exceptions. In addition when taking an exception the exception code is still using the thread SP without relying on any interrupt stack. If from one hand this makes the context switch really quick because the thread context is already on the thread stack so we have only to save one register (SP) for the whole context, on the other hand the major limitation introduced by this choice is that if for some reason the thread SP is corrupted or pointing to some unaccessible location (for example in case of stack overflow), the exception code is unable to recover or even deal with it. The usual way of dealing with this kind of problems is to use a dedicated interrupt stack on SP_EL1 when servicing the exceptions. The real drawback of this is that, in case of context switch, all the context must be copied from the shared interrupt stack into a thread-specific stack or structure, so it is really slow. We use here an hybrid approach, sacrificing a bit of stack space for a quicker context switch. While nothing really changes for kernel threads, for user threads we now use the privileged stack (already present to service syscalls) as interrupt stack. When an exception arrives the code now switches to use SP_EL1 that for user threads is always pointing inside the privileged portion of the stack of the current running thread. This achieves two things: (1) isolate exceptions and syscall code to use a stack that is isolated, privileged and not accessible to user threads and (2) the thread SP is not touched at all during exceptions, so it can be invalid or corrupted without any direct consequence. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-04-22 02:14:14 +08:00
GEN_NAMED_OFFSET_SYM(_callee_saved_t, x29, x29_sp_el0);
arm64: improved arch_switch() implementation Make it optimal without the need for an SVC/exception roundtrip on every context switch. Performance numbers from tests/benchmarks/sched: Before: unpend 85 ready 58 switch 258 pend 231 tot 632 (avg 699) After: unpend 85 ready 59 switch 115 pend 138 tot 397 (avg 478) Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
2022-03-15 01:51:40 +08:00
GEN_NAMED_OFFSET_SYM(_callee_saved_t, sp_elx, sp_elx_lr);
aarch64: Use absolute symbols for the callee saved registers Use GEN_OFFSET_SYM macro to genarate absolute symbols for the _callee_saved struct and use these new symbols in the assembly code. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2020-11-11 21:29:44 +08:00
GEN_ABSOLUTE_SYM(___callee_saved_t_SIZEOF, sizeof(struct _callee_saved));
aarch64: Use macro-generated absolute symbols for the ESF As done already for other structs, use the macro-generated offsets when referencing register in the ESF. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2020-11-11 23:19:40 +08:00
GEN_NAMED_OFFSET_SYM(_esf_t, spsr, spsr_elr);
arm64: refer to the link register as "lr" rather than "x30" In ARM parlance, the subroutine call return address is stored in the "link register" or simply lr. Refer to it as lr which is clearer than the anonymous x30 designation. Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
2022-03-17 01:12:39 +08:00
GEN_NAMED_OFFSET_SYM(_esf_t, x18, x18_lr);
aarch64: Use macro-generated absolute symbols for the ESF As done already for other structs, use the macro-generated offsets when referencing register in the ESF. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2020-11-11 23:19:40 +08:00
GEN_NAMED_OFFSET_SYM(_esf_t, x16, x16_x17);
GEN_NAMED_OFFSET_SYM(_esf_t, x14, x14_x15);
GEN_NAMED_OFFSET_SYM(_esf_t, x12, x12_x13);
GEN_NAMED_OFFSET_SYM(_esf_t, x10, x10_x11);
GEN_NAMED_OFFSET_SYM(_esf_t, x8, x8_x9);
GEN_NAMED_OFFSET_SYM(_esf_t, x6, x6_x7);
GEN_NAMED_OFFSET_SYM(_esf_t, x4, x4_x5);
GEN_NAMED_OFFSET_SYM(_esf_t, x2, x2_x3);
GEN_NAMED_OFFSET_SYM(_esf_t, x0, x0_x1);
GEN_ABSOLUTE_SYM(___esf_t_SIZEOF, sizeof(_esf_t));
aarch64: smccc: Use offset macros Instead of relying on hardcoded offset in the assembly code, introduce the offset macros to make the code more clear. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-02-03 19:07:49 +08:00
#ifdef CONFIG_HAS_ARM_SMCCC
arm/arm64: Make ARM64 a standalone architecture Split ARM and ARM64 architectures. Details: - CONFIG_ARM64 is decoupled from CONFIG_ARM (not a subset anymore) - Arch and include AArch64 files are in a dedicated directory (arch/arm64 and include/arch/arm64) - AArch64 boards and SoC are moved to soc/arm64 and boards/arm64 - AArch64-specific DTS files are moved to dts/arm64 - The A72 support for the bcm_vk/viper board is moved in the boards/bcm_vk/viper directory Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-03-25 18:56:15 +08:00
#include <arch/arm64/arm-smccc.h>
aarch64: smccc: Use offset macros Instead of relying on hardcoded offset in the assembly code, introduce the offset macros to make the code more clear. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-02-03 19:07:49 +08:00
GEN_NAMED_OFFSET_SYM(arm_smccc_res_t, a0, a0_a1);
GEN_NAMED_OFFSET_SYM(arm_smccc_res_t, a2, a2_a3);
aarch64: smccc: Retrieve up to 8 64-bit values The most common secure monitor firmware in the ARM world is TF-A. The current release allows up to 8 64-bit values to be returned from a SMC64 call from AArch64 state. Extend the number of possible return values from 4 to 8. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-02-03 19:10:45 +08:00
GEN_NAMED_OFFSET_SYM(arm_smccc_res_t, a4, a4_a5);
GEN_NAMED_OFFSET_SYM(arm_smccc_res_t, a6, a6_a7);
aarch64: smccc: Use offset macros Instead of relying on hardcoded offset in the assembly code, introduce the offset macros to make the code more clear. Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-02-03 19:07:49 +08:00
#endif /* CONFIG_HAS_ARM_SMCCC */
arm/arm64: Make ARM64 a standalone architecture Split ARM and ARM64 architectures. Details: - CONFIG_ARM64 is decoupled from CONFIG_ARM (not a subset anymore) - Arch and include AArch64 files are in a dedicated directory (arch/arm64 and include/arch/arm64) - AArch64 boards and SoC are moved to soc/arm64 and boards/arm64 - AArch64-specific DTS files are moved to dts/arm64 - The A72 support for the bcm_vk/viper board is moved in the boards/bcm_vk/viper directory Signed-off-by: Carlo Caione <ccaione@baylibre.com>
2021-03-25 18:56:15 +08:00
GEN_ABS_SYM_END
arm: add include guard for offset files MISRA-C directive 4.10 requires that files being included must prevent itself from being included more than once. So add include guards to the offset files, even though they are C source files. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2020-07-22 05:00:14 +08:00
#endif /* _ARM_OFFSETS_INC_ */