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kern: add speculation barriers after eret

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This commit is contained in:
Michael Scire 2023-10-11 03:21:06 -07:00
parent 9e99f36d7c
commit b9a4c2bdba
6 changed files with 22 additions and 19 deletions
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5
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_assembly_macros.h
View file

@ -94,3 +94,8 @@ label_done:
ENABLE_FPU(xtmp1) \
GET_THREAD_CONTEXT_AND_RESTORE_FPCR_FPSR(ctx, xtmp1, xtmp2, wtmp1, wtmp2) \
RESTORE_FPU32_ALL_REGISTERS(ctx, xtmp1)
#define ERET_WITH_SPECULATION_BARRIER \
eret; \
dsb nsh; \
isb

2
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_exception_asm.s
View file

@ -130,4 +130,4 @@ _ZN3ams4kern3svc14RestoreContextEm:
/* Return. */
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
eret
ERET_WITH_SPECULATION_BARRIER

8
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_handlers_asm.s
View file

@ -194,7 +194,7 @@ _ZN3ams4kern4arch5arm6412SvcHandler64Ev:
/* Return. */
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
eret
ERET_WITH_SPECULATION_BARRIER
5: /* Return from SVC. */
@ -297,7 +297,7 @@ _ZN3ams4kern4arch5arm6412SvcHandler64Ev:
/* Return. */
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::SvcHandler32() */
.section .text._ZN3ams4kern4arch5arm6412SvcHandler32Ev, "ax", %progbits
@ -467,7 +467,7 @@ _ZN3ams4kern4arch5arm6412SvcHandler32Ev:
/* Return. */
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
eret
ERET_WITH_SPECULATION_BARRIER
5: /* Return from SVC. */
@ -547,4 +547,4 @@ _ZN3ams4kern4arch5arm6412SvcHandler32Ev:
/* Return. */
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
eret
ERET_WITH_SPECULATION_BARRIER

2
mesosphere/kernel/source/arch/arm64/init/start.s
View file

@ -377,7 +377,7 @@ _ZN3ams4kern4init16JumpFromEL2ToEL1Ev:
mov x0, #0xC5
msr spsr_el2, x0
eret
ERET_WITH_SPECULATION_BARRIER
#endif
/* ams::kern::init::DisableMmuAndCaches() */

18
mesosphere/kernel/source/arch/arm64/kern_exception_handlers_asm.s
View file

@ -64,7 +64,7 @@ _ZN3ams4kern4arch5arm6422EL1IrqExceptionHandlerEv:
add sp, sp, #(8 * 24)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::EL0A64IrqExceptionHandler() */
.section .text._ZN3ams4kern4arch5arm6425EL0A64IrqExceptionHandlerEv, "ax", %progbits
@ -150,7 +150,7 @@ _ZN3ams4kern4arch5arm6425EL0A64IrqExceptionHandlerEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::EL0A32IrqExceptionHandler() */
.section .text._ZN3ams4kern4arch5arm6425EL0A32IrqExceptionHandlerEv, "ax", %progbits
@ -218,7 +218,7 @@ _ZN3ams4kern4arch5arm6425EL0A32IrqExceptionHandlerEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::EL0SynchronousExceptionHandler() */
.section .text._ZN3ams4kern4arch5arm6430EL0SynchronousExceptionHandlerEv, "ax", %progbits
@ -331,7 +331,7 @@ _ZN3ams4kern4arch5arm6430EL0SynchronousExceptionHandlerEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
4: /* SVC from aarch32. */
ldp x16, x17, [sp], 16
@ -377,7 +377,7 @@ _ZN3ams4kern4arch5arm6430EL0SynchronousExceptionHandlerEv:
ldp x16, x17, [sp], 16
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::EL1SynchronousExceptionHandler() */
@ -441,7 +441,7 @@ _ZN3ams4kern4arch5arm6430EL1SynchronousExceptionHandlerEv:
/* Return false. */
mov x0, #0x0
msr elr_el1, x30
eret
ERET_WITH_SPECULATION_BARRIER
2: /* The exception wasn't an triggered by copying memory from userspace. */
ldr x0, [sp, #8]
@ -519,7 +519,7 @@ _ZN3ams4kern4arch5arm6430EL1SynchronousExceptionHandlerEv:
mrs x0, tpidr_el1
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::FpuAccessExceptionHandler() */
@ -542,7 +542,7 @@ _ZN3ams4kern4arch5arm6425FpuAccessExceptionHandlerEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::EL1SystemErrorHandler() */
.section .text._ZN3ams4kern4arch5arm6421EL1SystemErrorHandlerEv, "ax", %progbits
@ -680,5 +680,5 @@ _ZN3ams4kern4arch5arm6421EL0SystemErrorHandlerEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return from the exception. */
eret
ERET_WITH_SPECULATION_BARRIER

6
mesosphere/kernel/source/arch/arm64/kern_k_thread_context_asm.s
View file

@ -14,6 +14,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere/kern_select_assembly_offsets.h>
#include <mesosphere/kern_select_assembly_macros.h>
/* ams::kern::arch::arm64::UserModeThreadStarter() */
.section .text._ZN3ams4kern4arch5arm6421UserModeThreadStarterEv, "ax", %progbits
@ -62,7 +63,7 @@ _ZN3ams4kern4arch5arm6421UserModeThreadStarterEv:
add sp, sp, #(EXCEPTION_CONTEXT_SIZE)
/* Return to EL0 */
eret
ERET_WITH_SPECULATION_BARRIER
/* ams::kern::arch::arm64::SupervisorModeThreadStarter() */
.section .text._ZN3ams4kern4arch5arm6427SupervisorModeThreadStarterEv, "ax", %progbits
@ -84,6 +85,3 @@ _ZN3ams4kern4arch5arm6427SupervisorModeThreadStarterEv:
/* Mask I bit in DAIF */
msr daifclr, #2
br x1
/* This should never execute, but Nintendo includes an ERET here. */
eret