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Merge pull request #1986 from lubinszARM:pr_ring0_clean_1

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PiperOrigin-RevId: 303105826
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gVisor bot
2020-03-26 08:49:12 -07:00
parent de694e5484 5f0e8e6239
commit 7aa388ce74
1 changed files with 18 additions and 0 deletions
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pkg/sentry/platform/ring0/entry_arm64.s
+18
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@@ -394,6 +394,8 @@ TEXT ·Current(SB),NOSPLIT,$0-8
#define STACK_FRAME_SIZE 16
// kernelExitToEl0 is the entrypoint for application in guest_el0.
// Prepare the vcpu environment for container application.
TEXT ·kernelExitToEl0(SB),NOSPLIT,$0
// Step1, save sentry context into memory.
REGISTERS_SAVE(RSV_REG, CPU_REGISTERS)
@@ -464,7 +466,23 @@ TEXT ·kernelExitToEl0(SB),NOSPLIT,$0
ERET()
// kernelExitToEl1 is the entrypoint for sentry in guest_el1.
// Prepare the vcpu environment for sentry.
TEXT ·kernelExitToEl1(SB),NOSPLIT,$0
WORD $0xd538d092 //MRS TPIDR_EL1, R18
MOVD CPU_REGISTERS+PTRACE_PSTATE(RSV_REG), R1
WORD $0xd5184001 //MSR R1, SPSR_EL1
MOVD CPU_REGISTERS+PTRACE_PC(RSV_REG), R1
MSR R1, ELR_EL1
MOVD CPU_REGISTERS+PTRACE_SP(RSV_REG), R1
MOVD R1, RSP
REGISTERS_LOAD(RSV_REG, CPU_REGISTERS)
MOVD CPU_REGISTERS+PTRACE_R9(RSV_REG), RSV_REG_APP
ERET()
// Start is the CPU entrypoint.