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thermosphere: use adrp

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This commit is contained in:
TuxSH 2019-07-30 21:13:38 +02:00
parent a291bddcc1
commit b686af2008
1 changed files with 13 additions and 13 deletions
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26
thermosphere/src/start.s
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@ -13,10 +13,6 @@
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
#define cpuactlr_el1 s3_1_c15_c2_0
#define cpuectlr_el1 s3_1_c15_c2_1
.section .crt0, "ax", %progbits .section .crt0, "ax", %progbits
.align 3 .align 3
@ -34,14 +30,15 @@ start:
mov x19, #1 mov x19, #1
b _startCommon b _startCommon
start2: start2:
mov x19, #0 mov x19, xzr
_startCommon: _startCommon:
// Disable interrupts, select sp_el2 // Disable interrupts, select sp_el2
msr daifset, 0b1111 msr daifset, 0b1111
msr spsel, #1 msr spsel, #1
// Set VBAR // Set VBAR
ldr x8, =__vectors_start__ adrp x8, __vectors_start__
add x8, x8, #:lo12:__vectors_start__
msr vbar_el2, x8 msr vbar_el2, x8
// Set system to sane defaults, aarch64 for el1 // Set system to sane defaults, aarch64 for el1
@ -54,6 +51,7 @@ _startCommon:
msr sctlr_el2, x1 msr sctlr_el2, x1
msr hcr_el2, x2 msr hcr_el2, x2
msr dacr32_el2, x3 msr dacr32_el2, x3
msr sctlr_el1, x4
dsb sy dsb sy
isb isb
@ -62,8 +60,8 @@ _startCommon:
mrs x10, mpidr_el1 mrs x10, mpidr_el1
and x10, x10, #0xFF and x10, x10, #0xFF
// Set tmp stack // Set tmp stack (__stacks_top__ is aligned)
ldr x8, =__stacks_top__ adrp x8, __stacks_top__
lsl x9, x10, #10 lsl x9, x10, #10
sub sp, x8, x9 sub sp, x8, x9
@ -84,17 +82,19 @@ _store_arg:
// Don't call init array to save space? // Don't call init array to save space?
// Clear BSS & call main for the first core executing this code // Clear BSS & call main for the first core executing this code
cbz x19, _jump_to_main cbz x19, _jump_to_main
ldr x0, =__bss_start__ adrp x0, __bss_start__
mov w1, #0 add x0, x0, #:lo12:__bss_start__
ldr x2, =__end__ mov w1, wzr
adrp x2, __end__
add x2, x2, #:lo12:__end__
sub x2, x2, x0 sub x2, x2, x0
bl memset bl memset
_jump_to_main:
dsb sy dsb sy
isb isb
_jump_to_main:
bl main bl main
// Jump to kernel // Jump to kernel