From: Linus Walleij <linus.walleij@linaro.org>
To: Russell King <linux@armlinux.org.uk>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Arnd Bergmann <arnd@arndb.de>, Nicolas Pitre <nico@fluxnic.net>,
Linus Walleij <linus.walleij@linaro.org>,
Ard Biesheuvel <ardb@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] RFC: ARM: head: Save lr in r11 while setting up page tables
Date: Fri, 4 Sep 2020 10:19:48 +0200 [thread overview]
Message-ID: <20200904081949.5594-3-linus.walleij@linaro.org> (raw)
In-Reply-To: <20200904081949.5594-1-linus.walleij@linaro.org>
We might need to use lr as we want to be able to call
the debug print functions, so save lr to r11 and restore
lr from r11 in __create_page_tables.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
arch/arm/kernel/head.S | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 2bfdf33aa74c..8b089c4c0d17 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -171,10 +171,11 @@ ENDPROC(stext)
* r8 = phys_offset, r9 = cpuid, r10 = procinfo
*
* Returns:
- * r0, r3, r5-r7 corrupted
+ * r0, r3, r5-r7, r11 corrupted
* r4 = physical page table address
*/
__create_page_tables:
+ mov r11, lr @ we need to be able to call prints
pgtbl r4, r8 @ page table address
/*
@@ -350,6 +351,7 @@ __create_page_tables:
#ifdef CONFIG_ARM_LPAE
sub r4, r4, #0x1000 @ point to the PGD table
#endif
+ mov lr, r11
ret lr
ENDPROC(__create_page_tables)
.ltorg
--
2.26.2
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next prev parent reply other threads:[~2020-09-04 8:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-04 8:19 [PATCH 0/3] RFC: ARM section mapping debug prints Linus Walleij
2020-09-04 8:19 ` [PATCH 1/3] RFC: ARM: head: Use non-conditional instructions Linus Walleij
2020-09-04 8:19 ` Linus Walleij [this message]
2020-09-04 14:53 ` [PATCH 2/3] RFC: ARM: head: Save lr in r11 while setting up page tables Nicolas Pitre
2020-09-04 8:19 ` [PATCH 3/3] RFC: ARM: head: Debug prints for section mappings Linus Walleij
2020-09-04 15:51 ` Nicolas Pitre
2020-09-04 18:33 ` Nicolas Pitre
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