/* SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project */
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "core/arm/nce/arm_nce_asm_definitions.h"
#define LOAD_IMMEDIATE_32(reg, val) \
mov reg, #(((val) >> 0x00) & 0xFFFF); \
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl #16
/* static HaltReason Core::ArmNce::ReturnToRunCodeByTrampoline(void* tpidr, Core::GuestContext* ctx, u64 trampoline_addr) */
.section .text._ZN4Core6ArmNce27ReturnToRunCodeByTrampolineEPvPNS_12GuestContextEm, "ax", %progbits
.global _ZN4Core6ArmNce27ReturnToRunCodeByTrampolineEPvPNS_12GuestContextEm
.type _ZN4Core6ArmNce27ReturnToRunCodeByTrampolineEPvPNS_12GuestContextEm, %function
_ZN4Core6ArmNce27ReturnToRunCodeByTrampolineEPvPNS_12GuestContextEm:
/* Back up host sp to x3. */
/* Back up host tpidr_el0 to x4. */
mov x3, sp
mrs x4, tpidr_el0
/* Load guest sp. x5 is used as a scratch register. */
ldr x5, [x1, #(GuestContextSp)]
mov sp, x5
/* Offset GuestContext pointer to the host member. */
add x5, x1, #(GuestContextHostContext)
/* Save original host sp and tpidr_el0 (x3, x4) to host context. */
stp x3, x4, [x5, #(HostContextSpTpidrEl0)]
/* Save all callee-saved host GPRs. */
stp x19, x20, [x5, #(HostContextRegs+0x0)]
stp x21, x22, [x5, #(HostContextRegs+0x10)]
stp x23, x24, [x5, #(HostContextRegs+0x20)]
stp x25, x26, [x5, #(HostContextRegs+0x30)]
stp x27, x28, [x5, #(HostContextRegs+0x40)]
stp x29, x30, [x5, #(HostContextRegs+0x50)]
/* Save all callee-saved host FPRs. */
stp q8, q9, [x5, #(HostContextVregs+0x0)]
stp q10, q11, [x5, #(HostContextVregs+0x20)]
stp q12, q13, [x5, #(HostContextVregs+0x40)]
stp q14, q15, [x5, #(HostContextVregs+0x60)]
/* Load guest tpidr_el0 from argument. */
msr tpidr_el0, x0
/* Tail call the trampoline to restore guest state. */
br x2
/* static HaltReason Core::ArmNce::ReturnToRunCodeByExceptionLevelChange(int tid, void* tpidr) */
.section .text._ZN4Core6ArmNce37ReturnToRunCodeByExceptionLevelChangeEiPv, "ax", %progbits
.global _ZN4Core6ArmNce37ReturnToRunCodeByExceptionLevelChangeEiPv
.type _ZN4Core6ArmNce37ReturnToRunCodeByExceptionLevelChangeEiPv, %function
_ZN4Core6ArmNce37ReturnToRunCodeByExceptionLevelChangeEiPv:
/* This jumps to the signal handler, which will restore the entire context. */
/* On entry, x0 = thread id, which is already in the right place. */
/* Move tpidr to x9 so it is not trampled. */
mov x9, x1
/* Set up arguments. */
mov x8, #(__NR_tkill)
mov x1, #(ReturnToRunCodeByExceptionLevelChangeSignal)
/* Tail call the signal handler. */
svc #0
/* Block execution from flowing here. */
brk #1000
/* static void Core::ArmNce::ReturnToRunCodeByExceptionLevelChangeSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce50ReturnToRunCodeByExceptionLevelChangeSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce50ReturnToRunCodeByExceptionLevelChangeSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce50ReturnToRunCodeByExceptionLevelChangeSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce50ReturnToRunCodeByExceptionLevelChangeSignalHandlerEiPvS1_:
stp x29, x30, [sp, #-0x10]!
mov x29, sp
/* Call the context restorer with the raw context. */
mov x0, x2
bl _ZN4Core6ArmNce19RestoreGuestContextEPv
/* Save the old value of tpidr_el0. */
mrs x8, tpidr_el0
ldr x9, [x0, #(TpidrEl0NativeContext)]
str x8, [x9, #(GuestContextHostContext + HostContextTpidrEl0)]
/* Set our new tpidr_el0. */
msr tpidr_el0, x0
/* Unlock the context. */
bl _ZN4Core6ArmNce22UnlockThreadParametersEPv
/* Returning from here will enter the guest. */
ldp x29, x30, [sp], #0x10
ret
/* static void Core::ArmNce::BreakFromRunCodeSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_:
/* Check to see if we have the correct TLS magic. */
mrs x8, tpidr_el0
ldr w9, [x8, #(TpidrEl0TlsMagic)]
LOAD_IMMEDIATE_32(w10, TlsMagic)
cmp w9, w10
b.ne 1f
/* Correct TLS magic, so this is a guest interrupt. */
/* Restore host tpidr_el0. */
ldr x0, [x8, #(TpidrEl0NativeContext)]
ldr x3, [x0, #(GuestContextHostContext + HostContextTpidrEl0)]
msr tpidr_el0, x3
/* Tail call the restorer. */
mov x1, x2
b _ZN4Core6ArmNce16SaveGuestContextEPNS_12GuestContextEPv
/* Returning from here will enter host code. */
1:
/* Incorrect TLS magic, so this is a spurious signal. */
ret
/* static void Core::ArmNce::GuestFaultSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
/* Check to see if we have the correct TLS magic. */
mrs x8, tpidr_el0
ldr w9, [x8, #(TpidrEl0TlsMagic)]
LOAD_IMMEDIATE_32(w10, TlsMagic)
cmp w9, w10
b.eq 1f
/* Incorrect TLS magic, so this is a host fault. */
/* Tail call the handler. */
b _ZN4Core6ArmNce15HandleHostFaultEiPvS1_
1:
/* Correct TLS magic, so this is a guest fault. */
stp x29, x30, [sp, #-0x20]!
str x19, [sp, #0x10]
mov x29, sp
/* Save the old tpidr_el0. */
mov x19, x8
/* Restore host tpidr_el0. */
ldr x0, [x8, #(TpidrEl0NativeContext)]
ldr x3, [x0, #(GuestContextHostContext + HostContextTpidrEl0)]
msr tpidr_el0, x3
/* Call the handler. */
bl _ZN4Core6ArmNce16HandleGuestFaultEPNS_12GuestContextEPvS3_
/* If the handler returned false, we want to preserve the host tpidr_el0. */
cbz x0, 2f
/* Otherwise, restore guest tpidr_el0. */
msr tpidr_el0, x19
2:
ldr x19, [sp, #0x10]
ldp x29, x30, [sp], #0x20
ret
/* static void Core::ArmNce::LockThreadParameters(void* tpidr) */
.section .text._ZN4Core6ArmNce20LockThreadParametersEPv, "ax", %progbits
.global _ZN4Core6ArmNce20LockThreadParametersEPv
.type _ZN4Core6ArmNce20LockThreadParametersEPv, %function
_ZN4Core6ArmNce20LockThreadParametersEPv:
/* Offset to lock member. */
add x0, x0, #(TpidrEl0Lock)
1:
/* Clear the monitor. */
clrex
2:
/* Load-linked with acquire ordering. */
ldaxr w1, [x0]
/* If the value was SpinLockLocked, clear monitor and retry. */
cbz w1, 1b
/* Store-conditional SpinLockLocked with relaxed ordering. */
stxr w1, wzr, [x0]
/* If we failed to store, retry. */
cbnz w1, 2b
ret
/* static void Core::ArmNce::UnlockThreadParameters(void* tpidr) */
.section .text._ZN4Core6ArmNce22UnlockThreadParametersEPv, "ax", %progbits
.global _ZN4Core6ArmNce22UnlockThreadParametersEPv
.type _ZN4Core6ArmNce22UnlockThreadParametersEPv, %function
_ZN4Core6ArmNce22UnlockThreadParametersEPv:
/* Offset to lock member. */
add x0, x0, #(TpidrEl0Lock)
/* Load SpinLockUnlocked. */
mov w1, #(SpinLockUnlocked)
/* Store value with release ordering. */
stlr w1, [x0]
ret
