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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2020-12-18 10:11:51 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2020-12-23 09:19:17 +0100 |
| commit | 272534eb725f2486b7a32b39d998202a101bd36e (patch) | |
| tree | 1cd2ae81d871698e49093fb0ec2488d88e0593d9 /bsps/arm/shared/start/start.S | |
| parent | arm: Add support for Arm PMSAv8-32 (diff) | |
| download | rtems-272534eb725f2486b7a32b39d998202a101bd36e.tar.bz2 | |
bsps/arm: Set VBAR in start.S
Set the VBAR to the vector table in the start section before
bsp_start_hook_0() is called to earlier handle exceptions in RTEMS.
Set the VBAR to the normal vector table in start.S for the main
processor. Secondary processors set it in bsp_start_hook_0().
Update #4202.
Diffstat (limited to 'bsps/arm/shared/start/start.S')
| -rw-r--r-- | bsps/arm/shared/start/start.S | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/bsps/arm/shared/start/start.S b/bsps/arm/shared/start/start.S index 93590c1c36..9ebc2818e5 100644 --- a/bsps/arm/shared/start/start.S +++ b/bsps/arm/shared/start/start.S @@ -377,6 +377,20 @@ _start: #endif /* ARM_MULTILIB_VFP */ +#if (__ARM_ARCH >= 7 && __ARM_ARCH_PROFILE == 'A') || __ARM_ARCH >= 8 + /* + * Set VBAR to the vector table in the start section and make sure + * SCTLR[V] is cleared. Afterwards, exceptions are handled by RTEMS. + */ + ldr r0, =bsp_start_vector_table_begin + dsb + mcr p15, 0, r0, c12, c0, 0 + mrc p15, 0, r0, c1, c0, 0 + bic r1, r0, #0x2000 + mcr p15, 0, r1, c1, c0, 0 + isb +#endif + /* * Invoke the start hook 0. * @@ -414,7 +428,7 @@ bsp_start_hook_0_done: stmdb sp!, {r4, r5, r6} ldr r0, =bsp_vector_table_begin - adr r1, bsp_start_vector_table_begin + ldr r1, =bsp_start_vector_table_begin cmp r0, r1 beq .Lvector_table_copy_done ldmia r1!, {r2-r9} @@ -424,6 +438,18 @@ bsp_start_hook_0_done: .Lvector_table_copy_done: +#if (__ARM_ARCH >= 7 && __ARM_ARCH_PROFILE == 'A') || __ARM_ARCH >= 8 + /* + * This code path is only executed by the primary processor. Set the + * VBAR to the normal vector table. For secondary processors, this is + * done by bsp_start_hook_0(). + */ + ldr r0, =bsp_vector_table_begin + dsb + mcr p15, 0, r0, c12, c0, 0 + isb +#endif + ldmia sp!, {r0, r1, r2} SWITCH_FROM_ARM_TO_THUMB r3 |