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kern: swap tpidr_el1/cntv_cval_el0 as scratch vs exception stack

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This commit is contained in:
Michael Scire 2021-04-07 08:36:03 -07:00
parent c39bce4620
commit e2f21cbd84
3 changed files with 9 additions and 6 deletions
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2
libmesosphere/include/mesosphere/arch/arm64/kern_cpu.hpp
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@ -232,7 +232,7 @@ namespace ams::kern::arch::arm64::cpu {
}
ALWAYS_INLINE void SetExceptionThreadStackTop(uintptr_t top) {
SetTpidrEl1(top);
cpu::SetCntvCvalEl0(top);
}
ALWAYS_INLINE void SwitchThreadLocalRegion(uintptr_t tlr) {

1
libmesosphere/include/mesosphere/arch/arm64/kern_cpu_system_registers.hpp
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@ -74,6 +74,7 @@ namespace ams::kern::arch::arm64::cpu {
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CntkCtlEl1, cntkctl_el1)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CntpCtlEl0, cntp_ctl_el0)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CntpCvalEl0, cntp_cval_el0)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(CntvCvalEl0, cntv_cval_el0)
MESOSPHERE_CPU_DEFINE_SYSREG_ACCESSORS(Daif, daif)

12
libmesosphere/source/board/nintendo/nx/kern_k_sleep_manager_asm.s
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@ -95,9 +95,10 @@ _ZN3ams4kern5board8nintendo2nx13KSleepManager15CpuSleepHandlerEmm:
mrs x2, tpidr_el1
stp x1, x2, [x0], #0x10
/* Save the virtual resumption entrypoint. */
/* Save the virtual resumption entrypoint and cntv_cval_el0. */
adr x1, 77f
stp x1, xzr, [x0], #0x10
mrs x2, cntv_cval_el0
stp x1, x2, [x0], #0x10
/* Get the current core id. */
mrs x0, mpidr_el1
@ -245,12 +246,13 @@ _ZN3ams4kern5board8nintendo2nx13KSleepManager11ResumeEntryEm:
msr tcr_el1, x1
msr mair_el1, x2
/* Get sctlr, tpidr, and the entrypoint. */
ldp x1, x2, [x0], #0x10
ldp x3, xzr, [x0], #0x10
/* Get sctlr, tpidr, the entrypoint, and cntv_cval_el0. */
ldp x1, x2, [x0], #0x10
ldp x3, x4, [x0], #0x10
/* Set the global context back into x18/tpidr. */
msr tpidr_el1, x2
msr cntv_cval_el0, x4
dsb sy
isb