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kern: retrieve target firmware from exosphere instead of hardcoding

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Michael Scire 2020-07-14 19:52:41 -07:00 • committed by SciresM
parent 2ca6772475
commit 9beb05da50
4 changed files with 35 additions and 24 deletions
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21
mesosphere/kernel/source/arch/arm64/init/start.s
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@ -94,6 +94,18 @@ core0_el2:
core0_el1:
bl _ZN3ams4kern4init19DisableMmuAndCachesEv
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
smc #1
cmp x0, #0
0:
b.ne 0b
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
/* We want to invoke kernel loader. */
adr x0, _start
adr x1, __metadata_kernel_layout
@ -102,14 +114,7 @@ core0_el1:
LOAD_FROM_LABEL(x3, __metadata_kernelldr_offset)
add x3, x0, x3
/* If kernelldr is ours, set its target firmware. */
ldr w4, [x3, #4]
LOAD_IMMEDIATE_32(w5, 0x30444C4D)
cmp w4, w5
b.ne 1f
LOAD_FROM_LABEL(x4, __metadata_target_firmware)
str w4, [x3, #8]
1:
/* Invoke kernel loader. */
blr x3
/* At this point kernelldr has been invoked, and we are relocated at a random virtual address. */

21
mesosphere/kernel_ldr/source/arch/arm64/start.s
View file

@ -18,6 +18,10 @@
#define cpuactlr_el1 s3_1_c15_c2_0
#define cpuectlr_el1 s3_1_c15_c2_1
#define LOAD_IMMEDIATE_32(reg, val) \
mov reg, #(((val) >> 0x00) & 0xFFFF); \
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl#16
.section .crt0.text.start, "ax", %progbits
.global _start
_start:
@ -46,12 +50,25 @@ _main:
ldr x17, [x17, #0x10] /* stack top */
add sp, x17, x18
/* Stack is now set up. */
/* Apply relocations and call init array for KernelLdr. */
/* Stack is now set up, so save important state. */
sub sp, sp, #0x30
stp x0, x1, [sp, #0x00]
stp x2, x30, [sp, #0x10]
stp xzr, xzr, [sp, #0x20]
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
smc #1
cmp x0, #0
0:
b.ne 0b
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
/* Apply relocations and call init array for KernelLdr. */
adr x0, _start
adr x1, __external_references
ldr x1, [x1, #0x18] /* .dynamic. */