mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2025-05-30 14:35:17 -04:00
kern/ldr: move crt0 into .rodata
This commit is contained in:
Michael Scire
parent
2a060d2645
commit
3f619a1fef
7 changed files with 220 additions and 90 deletions
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@ -33,7 +33,37 @@
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adr reg, label; \
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ldr reg, [reg]
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#define LOAD_RELATIVE_FROM_LABEL(reg, reg2, label) \
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adr reg2, label; \
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ldr reg, [reg2]; \
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add reg, reg, reg2
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#define INDIRECT_RELATIVE_CALL(reg, reg2, label) \
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adr reg, label; \
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add reg, reg, reg2; \
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blr reg
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#define SETUP_SYSTEM_REGISTER(_reg, _sr) \
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LOAD_FROM_LABEL(_reg, __sysreg_constant_ ## _sr); \
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msr _sr, _reg
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.section .start, "ax", %progbits
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.global _start
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_start:
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b _ZN3ams4kern4init10StartCore0Emm
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__metadata_magic_number:
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.ascii "MSS1" /* Magic, if executed as gadget "adds w13, w26, #0x4d4, lsl #12" */
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__metadata_offset:
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.word __metadata_begin - _start
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#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
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.global _ZN3ams4kern17GetTargetFirmwareEv
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.type _ZN3ams4kern17GetTargetFirmwareEv, %function
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_ZN3ams4kern17GetTargetFirmwareEv:
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adr x0, __metadata_target_firmware
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ldr w0, [x0]
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ret
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#endif
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.section .crt0.text.start, "ax", %progbits
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@ -45,43 +75,6 @@ _ZN3ams4kern4init31IdentityMappedFunctionAreaBeginEv:
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/* ================ Functions after this line remain identity-mapped after initialization finishes. ================ */
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.global _start
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_start:
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b _ZN3ams4kern4init10StartCore0Emm
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__metadata_begin:
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.ascii "MSS0" /* Magic */
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__metadata_ini_offset:
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.quad 0 /* INI1 base address. */
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__metadata_kernelldr_offset:
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.quad 0 /* Kernel Loader base address. */
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__metadata_target_firmware:
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.word 0xCCCCCCCC /* Target firmware. */
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__metadata_kernel_layout:
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.word _start - _start /* rx_offset */
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.word __rodata_start - _start /* rx_end_offset */
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.word __rodata_start - _start /* ro_offset */
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.word __data_start - _start /* ro_end_offset */
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.word __data_start - _start /* rw_offset */
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.word __bss_start__ - _start /* rw_end_offset */
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.word __bss_start__ - _start /* bss_offset */
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.word __bss_end__ - _start /* bss_end_offset */
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.word __end__ - _start /* resource_offset */
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.word _DYNAMIC - _start /* dynamic_offset */
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.word __init_array_start - _start /* init_array_offset */
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.word __init_array_end - _start /* init_array_end_offset */
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.if (. - __metadata_begin) != 0x48
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.error "Incorrect Mesosphere Metadata"
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.endif
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#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
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.global _ZN3ams4kern17GetTargetFirmwareEv
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.type _ZN3ams4kern17GetTargetFirmwareEv, %function
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_ZN3ams4kern17GetTargetFirmwareEv:
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adr x0, __metadata_target_firmware
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ldr w0, [x0]
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ret
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#endif
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/* ams::kern::init::StartCore0(uintptr_t, uintptr_t) */
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.section .crt0.text._ZN3ams4kern4init10StartCore0Emm, "ax", %progbits
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.global _ZN3ams4kern4init10StartCore0Emm
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@ -139,28 +132,31 @@ _ZN3ams4kern4init10StartCore0Emm:
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/* Get the unknown debug region. */
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/* TODO: This is always zero in release kernels -- what is this? Is it the device tree buffer? */
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mov x21, #0
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nop
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/* We want to invoke kernel loader. */
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adr x0, _start
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adr x1, __metadata_kernel_layout
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LOAD_FROM_LABEL(x2, __metadata_ini_offset)
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add x2, x0, x2
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LOAD_FROM_LABEL(x3, __metadata_kernelldr_offset)
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add x3, x0, x3
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LOAD_RELATIVE_FROM_LABEL(x2, x4, __metadata_ini_offset)
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LOAD_RELATIVE_FROM_LABEL(x3, x4, __metadata_kernelldr_offset)
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/* Invoke kernel loader. */
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blr x3
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/* Save the offset to virtual address from this page's physical address for our use. */
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mov x24, x1
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/* At this point kernelldr has been invoked, and we are relocated at a random virtual address. */
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/* Next thing to do is to set up our memory management and slabheaps -- all the other core initialization. */
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/* Call ams::kern::init::InitializeCore(uintptr_t, void **) */
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mov x1, x0 /* Kernelldr returns a state object for the kernel to re-use. */
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mov x0, x21 /* Use the address we determined earlier. */
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bl _ZN3ams4kern4init20InitializeCorePhase1EmPPv
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init20InitializeCorePhase1EmPPv)
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/* Get the init arguments for core 0. */
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mov x0, xzr
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bl _ZN3ams4kern4init16GetInitArgumentsEi
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nop
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init16GetInitArgumentsEi)
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/* Setup the stack pointer. */
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ldr x2, [x0, #(INIT_ARGUMENTS_SP)]
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@ -168,15 +164,24 @@ _ZN3ams4kern4init10StartCore0Emm:
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/* Perform further initialization with the stack pointer set up, as required. */
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/* This will include e.g. unmapping the identity mapping. */
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bl _ZN3ams4kern4init20InitializeCorePhase2Ev
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init20InitializeCorePhase2Ev)
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/* Get the init arguments for core 0. */
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mov x0, xzr
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bl _ZN3ams4kern4init16GetInitArgumentsEi
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nop
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init16GetInitArgumentsEi)
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/* Invoke the entrypoint. */
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/* Retrieve entrypoint and argument. */
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ldr x1, [x0, #(INIT_ARGUMENTS_ENTRYPOINT)]
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ldr x0, [x0, #(INIT_ARGUMENTS_ARGUMENT)]
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/* Set sctlr_el1 and ensure instruction consistency. */
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SETUP_SYSTEM_REGISTER(x3, sctlr_el1)
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dsb sy
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isb
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/* Invoke the entrypoint. */
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blr x1
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0: /* If we return here, something has gone wrong, so wait forever. */
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@ -218,15 +223,11 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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/* Disable the MMU/Caches. */
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bl _ZN3ams4kern4init19DisableMmuAndCachesEv
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/* Setup system registers using values from our KInitArguments. */
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ldr x1, [x20, #(INIT_ARGUMENTS_TTBR0)]
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msr ttbr0_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_TTBR1)]
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msr ttbr1_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_TCR)]
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msr tcr_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_MAIR)]
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msr mair_el1, x1
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/* Setup system registers using values from constants table. */
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SETUP_SYSTEM_REGISTER(x1, ttbr0_el1)
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SETUP_SYSTEM_REGISTER(x1, ttbr1_el1)
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SETUP_SYSTEM_REGISTER(x1, tcr_el1)
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SETUP_SYSTEM_REGISTER(x1, mair_el1)
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/* Perform cpu-specific setup. */
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mrs x1, midr_el1
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@ -251,13 +252,12 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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isb
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/* Load remaining needed fields from the init args. */
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ldr x3, [x20, #(INIT_ARGUMENTS_SCTLR)]
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ldr x2, [x20, #(INIT_ARGUMENTS_SP)]
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ldr x1, [x20, #(INIT_ARGUMENTS_ENTRYPOINT)]
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ldr x0, [x20, #(INIT_ARGUMENTS_ARGUMENT)]
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/* Set sctlr_el1 and ensure instruction consistency. */
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msr sctlr_el1, x3
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SETUP_SYSTEM_REGISTER(x3, sctlr_el1)
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dsb sy
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isb
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@ -271,6 +271,35 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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0: /* If we return here, something has gone wrong, so wait forever. */
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b 0b
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/* Nintendo places the metadata after StartOthercore. */
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.align 8
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__metadata_begin:
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__metadata_ini_offset:
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.quad 0 /* INI1 base address. */
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__metadata_kernelldr_offset:
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.quad 0 /* Kernel Loader base address. */
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__metadata_target_firmware:
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.word 0xCCCCCCCC /* Target firmware. */
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__metadata_kernel_layout:
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.word _start - __metadata_kernel_layout /* rx_offset */
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.word __rodata_start - __metadata_kernel_layout /* rx_end_offset */
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.word __rodata_start - __metadata_kernel_layout /* ro_offset */
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.word __data_start - __metadata_kernel_layout /* ro_end_offset */
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.word __data_start - __metadata_kernel_layout /* rw_offset */
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.word __bss_start__ - __metadata_kernel_layout /* rw_end_offset */
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.word __bss_start__ - __metadata_kernel_layout /* bss_offset */
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.word __bss_end__ - __metadata_kernel_layout /* bss_end_offset */
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.word __end__ - __metadata_kernel_layout /* resource_offset */
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.word _DYNAMIC - __metadata_kernel_layout /* dynamic_offset */
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.word __init_array_start - __metadata_kernel_layout /* init_array_offset */
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.word __init_array_end - __metadata_kernel_layout /* init_array_end_offset */
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.word __sysreg_constant_begin - __metadata_kernel_layout /* sysreg_offset */
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.if (. - __metadata_begin) != 0x48
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.error "Incorrect Mesosphere Metadata"
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.endif
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/* TODO: Can we remove this while retaining QEMU support? */
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#ifndef ATMOSPHERE_BOARD_NINTENDO_NX
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/* ams::kern::init::JumpFromEL2ToEL1() */
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@ -564,6 +593,24 @@ _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv:
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ret
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/* System register values. */
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.align 8
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__sysreg_constant_begin:
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__sysreg_constant_ttbr0_el1:
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.quad 0 /* ttbr0_e11. */
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__sysreg_constant_ttbr1_el1:
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.quad 0 /* ttbr1_e11. */
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__sysreg_constant_tcr_el1:
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.quad 0 /* tcr_e11. */
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__sysreg_constant_mair_el1:
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.quad 0 /* mair_e11. */
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__sysreg_constant_sctlr_el1:
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.quad 0 /* sctlr_e11. */
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.if (. - __sysreg_constant_begin) != 0x28
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.error "Incorrect System Registers"
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.endif
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/* ================ Functions before this line remain identity-mapped after initialization finishes. ================ */
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/* ams::kern::init::IdentityMappedFunctionAreaEnd() */
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