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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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114 changed files with 7521 additions and 16320 deletions
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10
portable/RVDS/ARM_CM4_MPU/portmacro.h
View file

@ -253,12 +253,10 @@ typedef struct MPU_SETTINGS
/*-----------------------------------------------------------*/
/* SVC numbers for various services. */
#define portSVC_START_SCHEDULER 0
#define portSVC_YIELD 1
#define portSVC_RAISE_PRIVILEGE 2
#define portSVC_SYSTEM_CALL_ENTER 3 /* System calls with upto 4 parameters. */
#define portSVC_SYSTEM_CALL_ENTER_1 4 /* System calls with 5 parameters. */
#define portSVC_SYSTEM_CALL_EXIT 5
#define portSVC_START_SCHEDULER 100
#define portSVC_YIELD 101
#define portSVC_RAISE_PRIVILEGE 102
#define portSVC_SYSTEM_CALL_EXIT 103
/* Scheduler utilities. */