coreboot-kgpe-d16/payloads/libpayload/include/arm64/arch/exception.h

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/*
* This file is part of the libpayload project.
*
* Copyright 2014 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_EXCEPTION_H
#define _ARCH_EXCEPTION_H
#define EXCEPTION_STATE_ELR 0x0
#define EXCEPTION_STATE_ESR 0x8
#define EXCEPTION_STATE_SPSR 0x10
#define EXCEPTION_STATE_SP 0x18
#define EXCEPTION_STATE_REG(r) (0x20 + r * 0x8)
#define ESR_EC_UNKNOWN 0b000000
#define ESR_EC_SVC_64 0b010101
#define ESR_EC_INSN_ABT_LOWER 0b100000
#define ESR_EC_INSN_ABT_SAME 0b100001
#define ESR_EC_DATA_ABT_LOWER 0b100100
#define ESR_EC_DATA_ABT_SAME 0b100101
#define ESR_EC_SERROR 0b101111
#define ESR_EC_SS_SAME 0b110011
#define ESR_EC_BKPT_64 0b111100
#define MDCR_TDE (1 << 8)
#define MDSCR_SS (1 << 0)
#define MDSCR_KDE (1 << 13)
#define MDSCR_MDE (1 << 15)
#ifndef __ASSEMBLER__
#include <stddef.h>
#include <stdint.h>
struct exception_state
{
uint64_t elr;
union {
uint64_t esr;
union {
struct {
uint64_t iss : 25;
uint64_t il : 1;
uint64_t ec : 6;
uint64_t _res0 : 32;
};
struct {
uint64_t isfc : 6;
uint64_t _res0 : 1;
uint64_t s1ptw : 1;
uint64_t _res1 : 1;
uint64_t ea : 1;
uint64_t fnv : 1;
uint64_t _res2 : 53;
} insn_abt;
};
};
union {
uint32_t spsr;
struct {
uint32_t sp : 1; /* M[0] */
uint32_t _res0 : 1; /* M[1] */
uint32_t el : 2; /* M[3:2] */
uint32_t arch : 1; /* M[4] */
uint32_t _res1 : 1;
uint32_t f : 1;
uint32_t i : 1;
uint32_t a : 1;
uint32_t d : 1;
uint32_t _res2 : 10;
uint32_t il : 1;
uint32_t ss : 1;
uint32_t _res3 : 6;
uint32_t v : 1;
uint32_t c : 1;
uint32_t z : 1;
uint32_t n : 1;
} pstate;
};
uint32_t spsr_high_unused;
uint64_t sp;
uint64_t regs[31];
} __packed;
#define CHECK_ES(field, constant) \
_Static_assert(offsetof(struct exception_state, field) == constant, \
"(struct exception_state)." #field " doesn't match constant " #constant)
CHECK_ES(elr, EXCEPTION_STATE_ELR);
CHECK_ES(esr, EXCEPTION_STATE_ESR);
CHECK_ES(spsr, EXCEPTION_STATE_SPSR);
CHECK_ES(sp, EXCEPTION_STATE_SP);
CHECK_ES(regs[0], EXCEPTION_STATE_REG(0));
CHECK_ES(regs[30], EXCEPTION_STATE_REG(30));
extern struct exception_state exception_state;
extern u64 exception_stack[];
extern u64 *exception_stack_end;
void exception_set_state_ptr(struct exception_state *exception_state_ptr);
libpayload: Rework exception hook interface This patch makes some slight changes to the exception hook interface. The old code provides a different handler hook for every exception type... however, in practice all those hook functions often need to look very similar, so this creates more boilerplate than it removes. The new interface just allows for a single hook with the exception type passed as an argument, and the consumer can signal whether the exception was handled through the return value. (Right now this still only supports one consumer, but it could easily be extended to walk through a list of hooks if the need arises.) Also move the excepton state from an argument to a global. This avoids a lot of boilerplate since some consumers need to change the state from many places, so they would have to pass the same pointer around many times. It also removes the false suggestion that the exception state was not global and you could have multiple copies of it (which the exception core doesn't support for any architecture). On the ARM side, the exception state is separated from the exception stack for easier access. (This requires some assembly changes, and I threw in a few comments and corrected the immediate sigils from '$' to the official '#' while I'm there.) Since the exception state is now both stored and loaded through an indirection pointer, this allows for some very limited reentrance (you could point it to a different struct while handling an exception, and while you still won't be able to return to the outer-level exception from there, you could at least swap out the pointer and return back to System Mode in one go). BUG=chrome-os-partner:18390 TEST=Made sure normal exceptions still get dumped correctly on both archs. Original-Change-Id: I5d9a934fab7c14ccb2c9d7ee4b3465c825521fa2 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/202562 Original-Reviewed-by: Stefan Reinauer <reinauer@chromium.org> (cherry picked from commit 97542110f0b385b9b8d89675866e65db8ca32aeb) Signed-off-by: Marc Jones <marc.jones@se-eng.com> *** Squashed to prevent build failures. *** libpayload: align arm64 with new exception handling model The exception handling was previously updated, however the arm64 changes raced with hat one. Make the arm64 align with the new model. Without these changes compilation will fail. BUG=None BRANCH=None TEST=Can build libpayload for rush. Original-Change-Id: I320b39a57b985d1f87446ea7757955664f8dba8f Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/204402 Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org> Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org> (cherry picked from commit 0080df41b311ef20f9214b386fa4e38ee54aa1a1) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I9a0bb3848cf5286f9f4bb08172a9f4a15278348e Reviewed-on: http://review.coreboot.org/8117 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2014-05-16 04:41:52 +02:00
enum {
EXC_SYNC_SP0 = 0,
EXC_IRQ_SP0,
EXC_FIQ_SP0,
EXC_SERROR_SP0,
EXC_SYNC_SPX,
EXC_IRQ_SPX,
EXC_FIQ_SPX,
EXC_SERROR_SPX,
EXC_SYNC_ELX_64,
EXC_IRQ_ELX_64,
EXC_FIQ_ELX_64,
EXC_SERROR_ELX_64,
EXC_SYNC_ELX_32,
EXC_IRQ_ELX_32,
EXC_FIQ_ELX_32,
EXC_SERROR_ELX_32,
EXC_COUNT
};
#endif /* !__ASSEMBLER__ */
#endif