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[libcpu/arm64] feat: Trimming General Context 

This patch focuses on the ARM64 general context handling code.
The modifications are aimed at enhancing performance by simplifying
context save/restore operations.

Changes include:
- Adjusted stack alignment in `arch_set_thread_context` function.
- Updated `lwp_gcc.S` to reset frame pointer and link register.
- Refined `rt_hw_backtrace_frame_unwind` to handle user space address checks.
- Added `GET_THREAD_SELF` macro in `asm-generic.h`.
- Simplified context saving/restoring in `context_gcc.h` and related files.
- Optimized `rt_hw_context_switch_interrupt` and related assembly routines.

Signed-off-by: Shell <smokewood@qq.com>
This commit is contained in:
Shell 2024-04-18 17:12:10 +08:00
parent 861e32490f
commit 7138f340b2
13 changed files with 172 additions and 158 deletions
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10
components/lwp/arch/aarch64/cortex-a/lwp_arch.c
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@ -106,18 +106,16 @@ int arch_set_thread_context(void (*exit)(void), void *new_thread_stack,
struct rt_hw_exp_stack *ori_syscall = rt_thread_self()->user_ctx.ctx;
RT_ASSERT(ori_syscall != RT_NULL);
thread_frame = (void *)((long)new_thread_stack - sizeof(struct rt_hw_exp_stack));
syscall_frame = (void *)((long)new_thread_stack - 2 * sizeof(struct rt_hw_exp_stack));
new_thread_stack = (rt_ubase_t*)RT_ALIGN_DOWN((rt_ubase_t)new_thread_stack, 16);
syscall_frame = (void *)((long)new_thread_stack - sizeof(struct rt_hw_exp_stack));
memcpy(syscall_frame, ori_syscall, sizeof(*syscall_frame));
syscall_frame->sp_el0 = (long)user_stack;
syscall_frame->x0 = 0;
thread_frame->cpsr = ((3 << 6) | 0x4 | 0x1);
thread_frame->pc = (long)exit;
thread_frame->x0 = 0;
thread_frame = (void *)rt_hw_stack_init(exit, RT_NULL, (void *)syscall_frame, RT_NULL);
*thread_sp = syscall_frame;
*thread_sp = thread_frame;
return 0;
}

5
components/lwp/arch/aarch64/cortex-a/lwp_gcc.S
View File

@ -125,12 +125,15 @@ lwp_exec_user:
* since this routine reset the SP, we take it as a start point
*/
START_POINT(SVC_Handler)
mov fp, xzr
mov lr, xzr
/* x0 is initial sp */
mov sp, x0
msr daifclr, #3 /* enable interrupt */
bl rt_thread_self
GET_THREAD_SELF x0
bl lwp_user_setting_save
ldp x8, x9, [sp, #(CONTEXT_OFFSET_X8)]

7
libcpu/aarch64/common/backtrace.c
View File

@ -85,11 +85,12 @@ rt_err_t rt_hw_backtrace_frame_unwind(rt_thread_t thread, struct rt_hw_backtrace
if (fp && !((long)fp & 0x7))
{
#ifdef RT_USING_SMART
#define IN_USER_SPACE(addr) ((rt_ubase_t)(addr) >= USER_VADDR_START && (rt_ubase_t)(addr) < USER_VADDR_TOP)
if (thread && thread->lwp && rt_scheduler_is_available())
{
rt_lwp_t lwp = thread->lwp;
void *this_lwp = lwp_self();
if (this_lwp == lwp && rt_kmem_v2p(fp) != ARCH_MAP_FAILED)
if ((!IN_USER_SPACE(fp) || this_lwp == lwp) && rt_kmem_v2p(fp) != ARCH_MAP_FAILED)
{
rc = _bt_kaddr(fp, frame);
}
@ -129,8 +130,8 @@ rt_err_t rt_hw_backtrace_frame_get(rt_thread_t thread, struct rt_hw_backtrace_fr
}
else
{
frame->pc = ARCH_CONTEXT_FETCH(thread->sp, 3);
frame->fp = ARCH_CONTEXT_FETCH(thread->sp, 7);
frame->pc = ARCH_CONTEXT_FETCH(thread->sp, 0);
frame->fp = ARCH_CONTEXT_FETCH(thread->sp, 4);
rc = RT_EOK;
}
return rc;

11
libcpu/aarch64/common/include/asm-generic.h
View File

@ -23,4 +23,15 @@
.cfi_endproc; \
.size name, .-name;
.macro GET_THREAD_SELF, dst:req
#ifdef ARCH_USING_HW_THREAD_SELF
mrs x0, tpidr_el1
#else /* !ARCH_USING_HW_THREAD_SELF */
bl rt_thread_self
#endif /* ARCH_USING_HW_THREAD_SELF */
.if \dst != x0
mov dst, x0
.endif
.endm
#endif /* __ASM_GENERIC_H__ */

94
libcpu/aarch64/common/include/context_gcc.h
View File

@ -10,67 +10,61 @@
#ifndef __ARM64_INC_CONTEXT_H__
#define __ARM64_INC_CONTEXT_H__
.macro SAVE_CONTEXT_SWITCH
#include "armv8.h"
.macro SAVE_CONTEXT_SWITCH, tmpx, tmp2x
/* Save the entire context. */
SAVE_FPU sp
stp x0, x1, [sp, #-0x10]!
stp x2, x3, [sp, #-0x10]!
stp x4, x5, [sp, #-0x10]!
stp x6, x7, [sp, #-0x10]!
stp x8, x9, [sp, #-0x10]!
stp x10, x11, [sp, #-0x10]!
stp x12, x13, [sp, #-0x10]!
stp x14, x15, [sp, #-0x10]!
stp x16, x17, [sp, #-0x10]!
stp x18, x19, [sp, #-0x10]!
stp x20, x21, [sp, #-0x10]!
stp x22, x23, [sp, #-0x10]!
stp x24, x25, [sp, #-0x10]!
stp x26, x27, [sp, #-0x10]!
stp x28, x29, [sp, #-0x10]!
mrs x28, fpcr
mrs x29, fpsr
stp x28, x29, [sp, #-0x10]!
mrs x29, sp_el0
stp x29, x30, [sp, #-0x10]!
stp x19, x20, [sp, #-0x10]!
stp x21, x22, [sp, #-0x10]!
stp x23, x24, [sp, #-0x10]!
stp x25, x26, [sp, #-0x10]!
stp x27, x28, [sp, #-0x10]!
mrs \tmpx, sp_el0
stp x29, \tmpx, [sp, #-0x10]!
mrs \tmpx, fpcr
mrs \tmp2x, fpsr
stp \tmpx, \tmp2x, [sp, #-0x10]!
mov \tmpx, #((3 << 6) | 0x5) /* el1h, disable interrupt */
stp x30, \tmpx, [sp, #-0x10]!
.endm
.macro SAVE_CONTEXT_SWITCH_FAST
/* Save the entire context. */
add sp, sp, #-1 * CONTEXT_FPU_SIZE
add sp, sp, #-7 * 16
mov x19, #((3 << 6) | 0x4 | 0x1) /* el1h, disable interrupt */
mov x18, x30
stp lr, x19, [sp, #-0x10]!
stp x18, x19, [sp, #-0x10]!
.endm
.macro _RESTORE_CONTEXT_SWITCH
ldp x2, x3, [sp], #0x10 /* SPSR and ELR. */
ldp x30, x19, [sp], #0x10 /* SPSR and ELR. */
msr elr_el1, x30
msr spsr_el1, x19
tst x3, #0x1f
msr spsr_el1, x3
msr elr_el1, x2
ldp x29, x30, [sp], #0x10
msr sp_el0, x29
ldp x28, x29, [sp], #0x10
msr fpcr, x28
msr fpsr, x29
ldp x28, x29, [sp], #0x10
ldp x26, x27, [sp], #0x10
ldp x24, x25, [sp], #0x10
ldp x22, x23, [sp], #0x10
ldp x20, x21, [sp], #0x10
ldp x18, x19, [sp], #0x10
ldp x16, x17, [sp], #0x10
ldp x14, x15, [sp], #0x10
ldp x12, x13, [sp], #0x10
ldp x10, x11, [sp], #0x10
ldp x8, x9, [sp], #0x10
ldp x6, x7, [sp], #0x10
ldp x4, x5, [sp], #0x10
ldp x2, x3, [sp], #0x10
ldp x0, x1, [sp], #0x10
/* restore NEON */
ldp x19, x20, [sp], #0x10
msr fpcr, x19
msr fpsr, x20
ldp x29, x19, [sp], #0x10
msr sp_el0, x19
ldp x27, x28, [sp], #0x10
ldp x25, x26, [sp], #0x10
ldp x23, x24, [sp], #0x10
ldp x21, x22, [sp], #0x10
ldp x19, x20, [sp], #0x10
RESTORE_FPU sp
#ifdef RT_USING_SMART
beq arch_ret_to_user
#endif
eret
.endm

80
libcpu/aarch64/common/mp/context_gcc.S
View File

@ -35,13 +35,17 @@
rt_hw_context_switch_to:
ldr x0, [x0]
mov sp, x0
mov x0, x1
/* reserved to_thread */
mov x19, x1
mov x0, x19
bl rt_cpus_lock_status_restore
#ifdef RT_USING_SMART
bl rt_thread_self
mov x0, x19
bl lwp_user_setting_restore
#endif
b rt_hw_context_switch_exit
b _context_switch_exit
.globl rt_hw_context_switch
@ -53,7 +57,7 @@ to, struct rt_thread *to_thread);
* X2 --> to_thread
*/
rt_hw_context_switch:
SAVE_CONTEXT_SWITCH
SAVE_CONTEXT_SWITCH x19, x20
mov x3, sp
str x3, [x0] // store sp in preempted tasks TCB
ldr x0, [x1] // get new task stack pointer
@ -68,10 +72,15 @@ rt_hw_context_switch:
mov x0, x19
bl lwp_user_setting_restore
#endif
b rt_hw_context_switch_exit
b _context_switch_exit
.globl rt_hw_irq_exit
.globl rt_hw_context_switch_interrupt
#define EXP_FRAME x19
#define FROM_SPP x20
#define TO_SPP x21
#define TO_TCB x22
/*
* void rt_hw_context_switch_interrupt(context, from sp, to sp, tp tcb)
* X0 :interrupt context
@ -80,30 +89,45 @@ rt_hw_context_switch:
* X3 :to_thread's tcb
*/
rt_hw_context_switch_interrupt:
stp x0, x1, [sp, #-0x10]!
stp x2, x3, [sp, #-0x10]!
#ifdef RT_USING_DEBUG
/* debug frame for backtrace */
stp x29, x30, [sp, #-0x10]!
#ifdef RT_USING_SMART
bl rt_thread_self
bl lwp_user_setting_save
#endif
ldp x29, x30, [sp], #0x10
ldp x2, x3, [sp], #0x10
ldp x0, x1, [sp], #0x10
str x0, [x1]
ldr x0, [x2]
mov sp, x0
mov x0, x3
mov x19, x0
bl rt_cpus_lock_status_restore
mov x0, x19
#ifdef RT_USING_SMART
bl lwp_user_setting_restore
#endif
b rt_hw_context_switch_exit
#endif /* RT_USING_DEBUG */
.global rt_hw_context_switch_exit
rt_hw_context_switch_exit:
clrex
/* we can discard all the previous ABI here */
mov EXP_FRAME, x0
mov FROM_SPP, x1
mov TO_SPP, x2
mov TO_TCB, x3
#ifdef RT_USING_SMART
GET_THREAD_SELF x0
bl lwp_user_setting_save
#endif /* RT_USING_SMART */
/* reset SP of from-thread */
mov sp, EXP_FRAME
/* push context for swtich */
adr lr, rt_hw_irq_exit
SAVE_CONTEXT_SWITCH_FAST
/* save SP of from-thread */
mov x0, sp
str x0, [FROM_SPP]
/* setup SP to to-thread's */
ldr x0, [TO_SPP]
mov sp, x0
mov x0, TO_TCB
bl rt_cpus_lock_status_restore
#ifdef RT_USING_SMART
mov x0, TO_TCB
bl lwp_user_setting_restore
#endif /* RT_USING_SMART */
b _context_switch_exit
_context_switch_exit:
clrex
RESTORE_CONTEXT_SWITCH

6
libcpu/aarch64/common/mp/context_gcc.h
View File

@ -20,16 +20,10 @@
#include <armv8.h>
.macro RESTORE_CONTEXT_SWITCH
/* Set the SP to point to the stack of the task being restored. */
mov sp, x0
_RESTORE_CONTEXT_SWITCH
.endm
.macro RESTORE_IRQ_CONTEXT
/* Set the SP to point to the stack of the task being restored. */
mov sp, x0
ldp x2, x3, [sp], #0x10 /* SPSR and ELR. */
tst x3, #0x1f

6
libcpu/aarch64/common/mp/vector_gcc.S
View File

@ -15,10 +15,14 @@
#include "../include/vector_gcc.h"
#include "context_gcc.h"
.section .text
.globl vector_fiq
vector_fiq:
b .
.globl rt_hw_irq_exit
START_POINT(vector_irq)
SAVE_IRQ_CONTEXT
stp x0, x1, [sp, #-0x10]! /* X0 is thread sp */
@ -42,7 +46,7 @@ START_POINT(vector_irq)
ldp x0, x1, [sp], #0x10
bl rt_scheduler_do_irq_switch
mov x0, sp
rt_hw_irq_exit:
RESTORE_IRQ_CONTEXT
START_POINT_END(vector_irq)

54
libcpu/aarch64/common/stack.c
View File

@ -41,44 +41,22 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
*(rt_uint128_t *)stk = (rt_uint128_t) { 0 };
}
*(--stk) = (rt_ubase_t)0; /* X1 */
*(--stk) = (rt_ubase_t)parameter; /* X0 */
*(--stk) = (rt_ubase_t)3; /* X3 */
*(--stk) = (rt_ubase_t)2; /* X2 */
*(--stk) = (rt_ubase_t)5; /* X5 */
*(--stk) = (rt_ubase_t)4; /* X4 */
*(--stk) = (rt_ubase_t)7; /* X7 */
*(--stk) = (rt_ubase_t)6; /* X6 */
*(--stk) = (rt_ubase_t)9; /* X9 */
*(--stk) = (rt_ubase_t)8; /* X8 */
*(--stk) = (rt_ubase_t)11; /* X11 */
*(--stk) = (rt_ubase_t)10; /* X10 */
*(--stk) = (rt_ubase_t)13; /* X13 */
*(--stk) = (rt_ubase_t)12; /* X12 */
*(--stk) = (rt_ubase_t)15; /* X15 */
*(--stk) = (rt_ubase_t)14; /* X14 */
*(--stk) = (rt_ubase_t)17; /* X17 */
*(--stk) = (rt_ubase_t)16; /* X16 */
*(--stk) = (rt_ubase_t)tentry; /* X19, 1st param */
*(--stk) = (rt_ubase_t)18; /* X18 */
*(--stk) = (rt_ubase_t)21; /* X21 */
*(--stk) = (rt_ubase_t)texit; /* X20, 2nd param */
*(--stk) = (rt_ubase_t)23; /* X23 */
*(--stk) = (rt_ubase_t)22; /* X22 */
*(--stk) = (rt_ubase_t)25; /* X25 */
*(--stk) = (rt_ubase_t)24; /* X24 */
*(--stk) = (rt_ubase_t)27; /* X27 */
*(--stk) = (rt_ubase_t)26; /* X26 */
*(--stk) = (rt_ubase_t)0; /* X29 - addr 0 as AAPCS64 specified */
*(--stk) = (rt_ubase_t)28; /* X28 */
*(--stk) = (rt_ubase_t)0; /* FPSR */
*(--stk) = (rt_ubase_t)0; /* FPCR */
*(--stk) = (rt_ubase_t)0; /* X30 - procedure call link register. */
*(--stk) = (rt_ubase_t)0; /* sp_el0 */
*(--stk) = INITIAL_SPSR_EL1;
*(--stk) = (rt_ubase_t)_thread_start; /* Exception return address. */
*(--stk) = (rt_ubase_t)texit; /* X20, 2nd param */
*(--stk) = (rt_ubase_t)tentry; /* X19, 1st param */
*(--stk) = (rt_ubase_t)22; /* X22 */
*(--stk) = (rt_ubase_t)parameter; /* X21, 3rd param */
*(--stk) = (rt_ubase_t)24; /* X24 */
*(--stk) = (rt_ubase_t)23; /* X23 */
*(--stk) = (rt_ubase_t)26; /* X26 */
*(--stk) = (rt_ubase_t)25; /* X25 */
*(--stk) = (rt_ubase_t)28; /* X28 */
*(--stk) = (rt_ubase_t)27; /* X27 */
*(--stk) = (rt_ubase_t)0; /* sp_el0 */
*(--stk) = (rt_ubase_t)0; /* X29 - addr 0 as AAPCS64 specified */
*(--stk) = (rt_ubase_t)0; /* FPSR */
*(--stk) = (rt_ubase_t)0; /* FPCR */
*(--stk) = INITIAL_SPSR_EL1; /* Save Processor States */
*(--stk) = (rt_ubase_t)_thread_start; /* Exception return address. */
/* return task's current stack address */
return (rt_uint8_t *)stk;

1
libcpu/aarch64/common/stack_gcc.S
View File

@ -21,6 +21,7 @@
.section .text
START_POINT(_thread_start)
mov x0, x21
blr x19
mov x29, #0
blr x20

34
libcpu/aarch64/common/up/context_gcc.S
View File

@ -44,7 +44,7 @@ rt_thread_switch_interrupt_flag:
rt_hw_context_switch_to:
clrex
ldr x0, [x0]
RESTORE_CONTEXT_SWITCH
RESTORE_CONTEXT_SWITCH x0
/*
* void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to);
@ -55,23 +55,23 @@ rt_hw_context_switch_to:
.globl rt_hw_context_switch
rt_hw_context_switch:
clrex
SAVE_CONTEXT_SWITCH
SAVE_CONTEXT_SWITCH x19, x20
mov x2, sp
str x2, [x0] // store sp in preempted tasks TCB
ldr x0, [x1] // get new task stack pointer
RESTORE_CONTEXT_SWITCH
RESTORE_CONTEXT_SWITCH x0
/*
* void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to, rt_thread_t from_thread, rt_thread_t to_thread);
*/
.globl rt_thread_switch_interrupt_flag
.globl rt_interrupt_from_thread
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch_interrupt
/*
* void rt_hw_context_switch_interrupt(rt_ubase_t from, rt_ubase_t to, rt_thread_t from_thread, rt_thread_t to_thread);
*/
rt_hw_context_switch_interrupt:
clrex
ldr x6, =rt_thread_switch_interrupt_flag
ldr x7, [x6]
cmp x7, #1
@ -95,3 +95,23 @@ _reswitch:
ldr x6, =rt_interrupt_to_thread // set rt_interrupt_to_thread
str x1, [x6]
ret
.globl rt_hw_context_switch_interrupt_do
/**
* rt_hw_context_switch_interrupt_do(void)
*/
rt_hw_context_switch_interrupt_do:
clrex
SAVE_CONTEXT_SWITCH_FAST
ldr x3, =rt_interrupt_from_thread
ldr x4, [x3]
mov x0, sp
str x0, [x4] // store sp in preempted tasks's tcb
ldr x3, =rt_interrupt_to_thread
ldr x4, [x3]
ldr x0, [x4] // get new task's stack pointer
RESTORE_CONTEXT_SWITCH x0

6
libcpu/aarch64/common/up/context_gcc.h
View File

@ -19,9 +19,9 @@
#include <asm-fpu.h>
#include <armv8.h>
.macro RESTORE_CONTEXT_SWITCH
.macro RESTORE_CONTEXT_SWITCH using_sp
/* Set the SP to point to the stack of the task being restored. */
mov sp, x0
mov sp, \using_sp
#ifdef RT_USING_SMART
bl rt_thread_self
@ -34,8 +34,6 @@
.endm
.macro RESTORE_IRQ_CONTEXT
/* Set the SP to point to the stack of the task being restored. */
MOV SP, X0
#ifdef RT_USING_SMART
BL rt_thread_self
MOV X19, X0

16
libcpu/aarch64/common/up/vector_gcc.S
View File

@ -26,9 +26,7 @@
.globl vector_fiq
vector_fiq:
SAVE_IRQ_CONTEXT
stp x0, x1, [sp, #-0x10]!
bl rt_hw_trap_fiq
ldp x0, x1, [sp], #0x10
RESTORE_IRQ_CONTEXT
.globl rt_interrupt_enter
@ -36,19 +34,17 @@ vector_fiq:
.globl rt_thread_switch_interrupt_flag
.globl rt_interrupt_from_thread
.globl rt_interrupt_to_thread
.globl rt_hw_context_switch_interrupt_do
.align 8
.globl vector_irq
vector_irq:
SAVE_IRQ_CONTEXT
stp x0, x1, [sp, #-0x10]! /* X0 is thread sp */
bl rt_interrupt_enter
bl rt_hw_trap_irq
bl rt_interrupt_leave
ldp x0, x1, [sp], #0x10
/**
* if rt_thread_switch_interrupt_flag set, jump to
* rt_hw_context_switch_interrupt_do and don't return
@ -61,15 +57,7 @@ vector_irq:
mov x2, #0 // clear flag
str x2, [x1]
ldr x3, =rt_interrupt_from_thread
ldr x4, [x3]
str x0, [x4] // store sp in preempted tasks's tcb
ldr x3, =rt_interrupt_to_thread
ldr x4, [x3]
ldr x0, [x4] // get new task's stack pointer
RESTORE_IRQ_CONTEXT
bl rt_hw_context_switch_interrupt_do
vector_irq_exit:
RESTORE_IRQ_CONTEXT_WITHOUT_MMU_SWITCH