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Update system call entry mechanism (#898)

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Earlier the System Call entry from an unprivileged task
looked like:

1. SVC for entering system call.
2. System call implementation.
3. SVC for exiting system call.

Now, the system call entry needs to make only one SVC
call and everything else is handled internally.

This PR also makes the following changes:

1. Update the Access Control List (ACL) mechanism to
    grant access to all the kernel objects before the
    scheduler is started.
2. Add one struct param for system calls with 5 parameters.
    This removes the need for special handling for system
    calls with 5 parameters.
3. Remove raise privilege SVC when MPU wrapper v2 is used.
4. Add additional run time parameter checks to MPU wrappers
    for xTaskGenericNotify and xQueueTakeMutexRecursive APIs.
This commit is contained in:
Gaurav-Aggarwal-AWS 2023-11-23 10:47:47 +05:30 • committed by GitHub
parent 4ff01a7a4a
commit 76be28cdc6
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GPG key ID: 4AEE18F83AFDEB23
114 changed files with 7521 additions and 16320 deletions
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26
portable/IAR/ARM_CM23/non_secure/portasm.s
View file

@ -33,6 +33,9 @@ the code is included in C files but excluded by the preprocessor in assembly
files (__ICCARM__ is defined by the IAR C compiler but not by the IAR assembler. */
#include "FreeRTOSConfig.h"
/* System call numbers includes. */
#include "mpu_syscall_numbers.h"
#ifndef configUSE_MPU_WRAPPERS_V1
#define configUSE_MPU_WRAPPERS_V1 0
#endif
@ -46,7 +49,6 @@ files (__ICCARM__ is defined by the IAR C compiler but not by the IAR assembler.
EXTERN SecureContext_LoadContext
#if ( ( configENABLE_MPU == 1 ) && ( configUSE_MPU_WRAPPERS_V1 == 0 ) )
EXTERN vSystemCallEnter
EXTERN vSystemCallEnter_1
EXTERN vSystemCallExit
#endif
@ -96,7 +98,7 @@ vResetPrivilege:
/*-----------------------------------------------------------*/
vPortAllocateSecureContext:
svc 0 /* Secure context is allocated in the supervisor call. portSVC_ALLOCATE_SECURE_CONTEXT = 0. */
svc 100 /* Secure context is allocated in the supervisor call. portSVC_ALLOCATE_SECURE_CONTEXT = 100. */
bx lr /* Return. */
/*-----------------------------------------------------------*/
@ -229,7 +231,7 @@ vStartFirstTask:
cpsie i /* Globally enable interrupts. */
dsb
isb
svc 2 /* System call to start the first task. portSVC_START_SCHEDULER = 2. */
svc 102 /* System call to start the first task. portSVC_START_SCHEDULER = 102. */
/*-----------------------------------------------------------*/
ulSetInterruptMask:
@ -479,21 +481,17 @@ SVC_Handler:
b route_svc
route_svc:
ldr r2, [r0, #24]
subs r2, #2
ldrb r3, [r2, #0]
cmp r3, #4 /* portSVC_SYSTEM_CALL_ENTER. */
beq system_call_enter
cmp r3, #5 /* portSVC_SYSTEM_CALL_ENTER_1. */
beq system_call_enter_1
cmp r3, #6 /* portSVC_SYSTEM_CALL_EXIT. */
ldr r3, [r0, #24]
subs r3, #2
ldrb r2, [r3, #0]
cmp r2, #NUM_SYSTEM_CALLS
blt system_call_enter
cmp r2, #104 /* portSVC_SYSTEM_CALL_EXIT. */
beq system_call_exit
b vPortSVCHandler_C
system_call_enter:
b vSystemCallEnter
system_call_enter_1:
b vSystemCallEnter_1
system_call_exit:
b vSystemCallExit
@ -520,7 +518,7 @@ vPortFreeSecureContext:
bne free_secure_context /* Branch if r1 != 0. */
bx lr /* There is no secure context (xSecureContext is NULL). */
free_secure_context:
svc 1 /* Secure context is freed in the supervisor call. portSVC_FREE_SECURE_CONTEXT = 1. */
svc 101 /* Secure context is freed in the supervisor call. portSVC_FREE_SECURE_CONTEXT = 101. */
bx lr /* Return. */
/*-----------------------------------------------------------*/