From: Alexander Graf <agraf@suse.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v5 21/30] arm64: Allow exceptions to return
Date: Fri, 4 Mar 2016 01:10:05 +0100 [thread overview]
Message-ID: <1457050214-117592-22-git-send-email-agraf@suse.de> (raw)
In-Reply-To: <1457050214-117592-1-git-send-email-agraf@suse.de>
Our current arm64 exception handlers all panic and never return to the
exception triggering code.
But if any handler wanted to continue execution after fixups, it would
need help from the exception handling code to restore all registers.
This patch implements that help. With this code, exception handlers on
aarch64 can successfully return to the place the exception happened (or
somewhere else if they modify elr).
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/arm/cpu/armv8/exceptions.S | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/arch/arm/cpu/armv8/exceptions.S b/arch/arm/cpu/armv8/exceptions.S
index baf9401..4f4f526 100644
--- a/arch/arm/cpu/armv8/exceptions.S
+++ b/arch/arm/cpu/armv8/exceptions.S
@@ -82,31 +82,65 @@ vectors:
_do_bad_sync:
exception_entry
bl do_bad_sync
+ b exception_exit
_do_bad_irq:
exception_entry
bl do_bad_irq
+ b exception_exit
_do_bad_fiq:
exception_entry
bl do_bad_fiq
+ b exception_exit
_do_bad_error:
exception_entry
bl do_bad_error
+ b exception_exit
_do_sync:
exception_entry
bl do_sync
+ b exception_exit
_do_irq:
exception_entry
bl do_irq
+ b exception_exit
_do_fiq:
exception_entry
bl do_fiq
+ b exception_exit
_do_error:
exception_entry
bl do_error
+ b exception_exit
+
+exception_exit:
+ ldp x2, x0, [sp],#16
+ switch_el x11, 3f, 2f, 1f
+3: msr elr_el3, x2
+ b 0f
+2: msr elr_el2, x2
+ b 0f
+1: msr elr_el1, x2
+0:
+ ldp x1, x2, [sp],#16
+ ldp x3, x4, [sp],#16
+ ldp x5, x6, [sp],#16
+ ldp x7, x8, [sp],#16
+ ldp x9, x10, [sp],#16
+ ldp x11, x12, [sp],#16
+ ldp x13, x14, [sp],#16
+ ldp x15, x16, [sp],#16
+ ldp x17, x18, [sp],#16
+ ldp x19, x20, [sp],#16
+ ldp x21, x22, [sp],#16
+ ldp x23, x24, [sp],#16
+ ldp x25, x26, [sp],#16
+ ldp x27, x28, [sp],#16
+ ldp x29, x30, [sp],#16
+ eret
--
1.8.5.6
next prev parent reply other threads:[~2016-03-04 0:10 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 0:09 [U-Boot] [PATCH v5 00/30] EFI payload / application support Alexander Graf
2016-03-04 0:09 ` [U-Boot] [PATCH v5 01/30] thunderx: Calculate TCR dynamically Alexander Graf
2016-03-17 1:59 ` [U-Boot] [U-Boot,v5,01/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 02/30] arm64: Disable TTBR1 maps in EL1 Alexander Graf
2016-03-17 1:59 ` [U-Boot] [U-Boot,v5,02/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 03/30] arm64: Make full va map code more dynamic Alexander Graf
2016-03-17 1:59 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 04/30] thunderx: Move mmu table into board file Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 05/30] zymqmp: Replace home grown mmu code with generic table approach Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 06/30] tegra: " Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 07/30] vexpress64: Add MMU tables Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot,v5,07/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 08/30] dwmmc: Increase retry timeout Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot,v5,08/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 09/30] hikey: Add MMU tables Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot,v5,09/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 10/30] arm64: Remove non-full-va map code Alexander Graf
2016-03-17 2:00 ` [U-Boot] [U-Boot,v5,10/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 11/30] arm64: Only allow dcache disabled in SPL builds Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 12/30] disk/part.c: Expose list of available block drivers Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 13/30] include/efi_api.h: Add more detailed API definitions Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 14/30] efi_loader: Add PE image loader Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v5,14/30] " Tom Rini
2016-03-04 0:09 ` [U-Boot] [PATCH v5 15/30] efi_loader: Add boot time services Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v5,15/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 16/30] efi_loader: Add console interface Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v5,16/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 17/30] efi_loader: Add runtime services Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v5,17/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 18/30] efi_loader: Add disk interfaces Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v5,18/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 19/30] efi_loader: Add "bootefi" command Alexander Graf
2016-03-09 23:27 ` [U-Boot] [PATCH v6 " Alexander Graf
2016-03-17 2:01 ` [U-Boot] [U-Boot,v6,19/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 20/30] efi_loader: Implement memory allocation and map Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` Alexander Graf [this message]
2016-03-17 2:02 ` [U-Boot] [U-Boot,v5,21/30] arm64: Allow exceptions to return Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 22/30] arm64: Allow EFI payload code to take exceptions Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 23/30] efi_loader: hook up in build environment Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 24/30] efi_loader: Add distro boot script for removable media Alexander Graf
2016-03-09 23:05 ` Alexander Graf
2016-03-09 23:16 ` Tom Rini
2016-03-09 23:26 ` [U-Boot] [PATCH v6 " Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v6, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 25/30] efi_loader: Add README section in README.efi Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 26/30] efi_loader: Add MAINTAINERS entry Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot,v5,26/30] " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 27/30] arm64: Replace fdt_name env variables with fdtfile Alexander Graf
2016-03-17 2:02 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 28/30] arm: Allow EFI payload code to take exceptions Alexander Graf
2016-03-17 2:03 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 29/30] efi_loader: Call fdt preparation functions Alexander Graf
2016-03-17 2:03 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 0:10 ` [U-Boot] [PATCH v5 30/30] efi_loader: Pass proper device path in on boot Alexander Graf
2016-03-17 2:03 ` [U-Boot] [U-Boot, v5, " Tom Rini
2016-03-04 9:19 ` [U-Boot] [PATCH] efi_loader: Reserve 2 additional pages for fdt Alexander Graf
2016-03-04 9:41 ` Leif Lindholm
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