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nce: implement instruction emulation for misaligned memory accesses

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This commit is contained in:
Liam
2023-11-30 14:05:02 -05:00
parent d361150117
commit ecb3d74dcd
9 changed files with 3849 additions and 43 deletions
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src/core/arm/nce/arm_nce.s
+53 -7
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@@ -130,11 +130,11 @@ _ZN4Core6ArmNce29BreakFromRunCodeSignalHandlerEiPvS1_:
ret
/* static void Core::ArmNce::GuestFaultSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
/* static void Core::ArmNce::GuestAlignmentFaultSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce32GuestAlignmentFaultSignalHandlerEiPvS1_:
/* Check to see if we have the correct TLS magic. */
mrs x8, tpidr_el0
ldr w9, [x8, #(TpidrEl0TlsMagic)]
@@ -146,7 +146,7 @@ _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
/* Incorrect TLS magic, so this is a host fault. */
/* Tail call the handler. */
b _ZN4Core6ArmNce15HandleHostFaultEiPvS1_
b _ZN4Core6ArmNce24HandleHostAlignmentFaultEiPvS1_
1:
/* Correct TLS magic, so this is a guest fault. */
@@ -163,7 +163,53 @@ _ZN4Core6ArmNce23GuestFaultSignalHandlerEiPvS1_:
msr tpidr_el0, x3
/* Call the handler. */
bl _ZN4Core6ArmNce16HandleGuestFaultEPNS_12GuestContextEPvS3_
bl _ZN4Core6ArmNce25HandleGuestAlignmentFaultEPNS_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::GuestAccessFaultSignalHandler(int sig, void* info, void* raw_context) */
.section .text._ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_, "ax", %progbits
.global _ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_
.type _ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_, %function
_ZN4Core6ArmNce29GuestAccessFaultSignalHandlerEiPvS1_:
/* 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 _ZN4Core6ArmNce21HandleHostAccessFaultEiPvS1_
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 _ZN4Core6ArmNce22HandleGuestAccessFaultEPNS_12GuestContextEPvS3_
/* If the handler returned false, we want to preserve the host tpidr_el0. */
cbz x0, 2f