Revert "Handle exceptions."
This reverts commit 55fb4740bed7489cc28ad975b3b6a7253001ad2d.
Reason for revert: it breaks the build.
Change-Id: Ie1a0e0d5135e1125ec62fa3edffca3d2eeb1573a
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 6e37b03..ce096b6 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -24,7 +24,6 @@
name: "pvmfw",
srcs: [
"entry.S",
- "exceptions.S",
"idmap.S",
],
static_libs: [
diff --git a/pvmfw/entry.S b/pvmfw/entry.S
index f0021be..e5c6045 100644
--- a/pvmfw/entry.S
+++ b/pvmfw/entry.S
@@ -145,10 +145,6 @@
adr_l x30, boot_stack_end
mov sp, x30
- /* Set up exception vector. */
- adr x30, vector_table_el1
- msr vbar_el1, x30
-
/* Call into Rust code. */
bl main
diff --git a/pvmfw/exceptions.S b/pvmfw/exceptions.S
deleted file mode 100644
index 86ef83c..0000000
--- a/pvmfw/exceptions.S
+++ /dev/null
@@ -1,178 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * Saves the volatile registers onto the stack. This currently takes 14
- * instructions, so it can be used in exception handlers with 18 instructions
- * left.
- *
- * On return, x0 and x1 are initialised to elr_el2 and spsr_el2 respectively,
- * which can be used as the first and second arguments of a subsequent call.
- */
-.macro save_volatile_to_stack
- /* Reserve stack space and save registers x0-x18, x29 & x30. */
- stp x0, x1, [sp, #-(8 * 24)]!
- stp x2, x3, [sp, #8 * 2]
- stp x4, x5, [sp, #8 * 4]
- stp x6, x7, [sp, #8 * 6]
- stp x8, x9, [sp, #8 * 8]
- stp x10, x11, [sp, #8 * 10]
- stp x12, x13, [sp, #8 * 12]
- stp x14, x15, [sp, #8 * 14]
- stp x16, x17, [sp, #8 * 16]
- str x18, [sp, #8 * 18]
- stp x29, x30, [sp, #8 * 20]
-
- /*
- * Save elr_el1 & spsr_el1. This such that we can take nested exception
- * and still be able to unwind.
- */
- mrs x0, elr_el1
- mrs x1, spsr_el1
- stp x0, x1, [sp, #8 * 22]
-.endm
-
-/**
- * Restores the volatile registers from the stack. This currently takes 14
- * instructions, so it can be used in exception handlers while still leaving 18
- * instructions left; if paired with save_volatile_to_stack, there are 4
- * instructions to spare.
- */
-.macro restore_volatile_from_stack
- /* Restore registers x2-x18, x29 & x30. */
- ldp x2, x3, [sp, #8 * 2]
- ldp x4, x5, [sp, #8 * 4]
- ldp x6, x7, [sp, #8 * 6]
- ldp x8, x9, [sp, #8 * 8]
- ldp x10, x11, [sp, #8 * 10]
- ldp x12, x13, [sp, #8 * 12]
- ldp x14, x15, [sp, #8 * 14]
- ldp x16, x17, [sp, #8 * 16]
- ldr x18, [sp, #8 * 18]
- ldp x29, x30, [sp, #8 * 20]
-
- /* Restore registers elr_el1 & spsr_el1, using x0 & x1 as scratch. */
- ldp x0, x1, [sp, #8 * 22]
- msr elr_el1, x0
- msr spsr_el1, x1
-
- /* Restore x0 & x1, and release stack space. */
- ldp x0, x1, [sp], #8 * 24
-.endm
-
-/**
- * This is a generic handler for exceptions taken at the current EL while using
- * SP0. It behaves similarly to the SPx case by first switching to SPx, doing
- * the work, then switching back to SP0 before returning.
- *
- * Switching to SPx and calling the Rust handler takes 16 instructions. To
- * restore and return we need an additional 16 instructions, so we can implement
- * the whole handler within the allotted 32 instructions.
- */
-.macro current_exception_sp0 handler:req
- msr spsel, #1
- save_volatile_to_stack
- bl \handler
- restore_volatile_from_stack
- msr spsel, #0
- eret
-.endm
-
-/**
- * This is a generic handler for exceptions taken at the current EL while using
- * SPx. It saves volatile registers, calls the Rust handler, restores volatile
- * registers, then returns.
- *
- * This also works for exceptions taken from EL0, if we don't care about
- * non-volatile registers.
- *
- * Saving state and jumping to the Rust handler takes 15 instructions, and
- * restoring and returning also takes 15 instructions, so we can fit the whole
- * handler in 30 instructions, under the limit of 32.
- */
-.macro current_exception_spx handler:req
- save_volatile_to_stack
- bl \handler
- restore_volatile_from_stack
- eret
-.endm
-
-.section .text.vector_table_el1, "ax"
-.global vector_table_el1
-.balign 0x800
-vector_table_el1:
-sync_cur_sp0:
- current_exception_sp0 sync_exception_current
-
-.balign 0x80
-irq_cur_sp0:
- current_exception_sp0 irq_current
-
-.balign 0x80
-fiq_cur_sp0:
- current_exception_sp0 fiq_current
-
-.balign 0x80
-serr_cur_sp0:
- current_exception_sp0 serr_current
-
-.balign 0x80
-sync_cur_spx:
- current_exception_spx sync_exception_current
-
-.balign 0x80
-irq_cur_spx:
- current_exception_spx irq_current
-
-.balign 0x80
-fiq_cur_spx:
- current_exception_spx fiq_current
-
-.balign 0x80
-serr_cur_spx:
- current_exception_spx serr_current
-
-.balign 0x80
-sync_lower_64:
- current_exception_spx sync_lower
-
-.balign 0x80
-irq_lower_64:
- current_exception_spx irq_lower
-
-.balign 0x80
-fiq_lower_64:
- current_exception_spx fiq_lower
-
-.balign 0x80
-serr_lower_64:
- current_exception_spx serr_lower
-
-.balign 0x80
-sync_lower_32:
- current_exception_spx sync_lower
-
-.balign 0x80
-irq_lower_32:
- current_exception_spx irq_lower
-
-.balign 0x80
-fiq_lower_32:
- current_exception_spx fiq_lower
-
-.balign 0x80
-serr_lower_32:
- current_exception_spx serr_lower
diff --git a/pvmfw/src/exceptions.rs b/pvmfw/src/exceptions.rs
deleted file mode 100644
index 7668845..0000000
--- a/pvmfw/src/exceptions.rs
+++ /dev/null
@@ -1,81 +0,0 @@
-// Copyright 2022, The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//! Exception handlers.
-
-use crate::console::emergency_write_str;
-use crate::eprintln;
-use crate::psci::system_reset;
-use core::arch::asm;
-
-#[no_mangle]
-extern "C" fn sync_exception_current() {
- emergency_write_str("sync_exception_current\n");
- print_esr();
- system_reset();
-}
-
-#[no_mangle]
-extern "C" fn irq_current() {
- emergency_write_str("irq_current\n");
- system_reset();
-}
-
-#[no_mangle]
-extern "C" fn fiq_current() {
- emergency_write_str("fiq_current\n");
- system_reset();
-}
-
-#[no_mangle]
-extern "C" fn serr_current() {
- emergency_write_str("serr_current\n");
- print_esr();
- system_reset();
-}
-
-#[no_mangle]
-extern "C" fn sync_lower() {
- emergency_write_str("sync_lower\n");
- print_esr();
- reboot();
-}
-
-#[no_mangle]
-extern "C" fn irq_lower() {
- emergency_write_str("irq_lower\n");
- reboot();
-}
-
-#[no_mangle]
-extern "C" fn fiq_lower() {
- emergency_write_str("fiq_lower\n");
- reboot();
-}
-
-#[no_mangle]
-extern "C" fn serr_lower() {
- emergency_write_str("serr_lower\n");
- print_esr();
- reboot();
-}
-
-#[inline]
-fn print_esr() {
- let mut esr: u64;
- unsafe {
- asm!("mrs {esr}, esr_el1", esr = out(reg) esr);
- }
- eprintln!("esr={:#08x}", esr);
-}
diff --git a/pvmfw/src/main.rs b/pvmfw/src/main.rs
index d38b1e3..4ab14b7 100644
--- a/pvmfw/src/main.rs
+++ b/pvmfw/src/main.rs
@@ -18,7 +18,6 @@
#![no_std]
mod console;
-mod exceptions;
mod psci;
mod uart;