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From: Michael Tretter <m.tretter@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Michael Tretter <m.tretter@pengutronix.de>
Subject: [PATCH v2 3/4] ARM: aarch64: add ENTRY_PROC macro for arm64
Date: Wed, 28 Nov 2018 12:20:52 +0100	[thread overview]
Message-ID: <20181128112053.6027-4-m.tretter@pengutronix.de> (raw)
In-Reply-To: <20181128112053.6027-1-m.tretter@pengutronix.de>

arm64 has no __naked__ attribute and the compiler adds a function prologue
for saving x29 and x30 to the stack for all C functions. This includes
functions defined using the ENTRY_FUNCTION macro. Therefore, the stack
needs to be setup before entering a C function, which is not possible if
the entry is a C function.

Provide a macro to implement the entry in assembly to be able to setup the
stack before entering the low level entry function.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
 arch/arm/include/asm/barebox-arm64.h | 34 ++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 arch/arm/include/asm/barebox-arm64.h

diff --git a/arch/arm/include/asm/barebox-arm64.h b/arch/arm/include/asm/barebox-arm64.h
new file mode 100644
index 0000000000..e7eda22128
--- /dev/null
+++ b/arch/arm/include/asm/barebox-arm64.h
@@ -0,0 +1,34 @@
+#ifndef _BAREBOX_ARM64_H_
+#define _BAREBOX_ARM64_H_
+
+#include <linux/linkage.h>
+
+/*
+ * ENTRY_PROC - mark start of entry procedure
+ */
+#define ENTRY_PROC(name) \
+	.section .text_head_entry_##name; \
+	ENTRY(##name); \
+		b 2f; \
+		nop; \
+		nop; \
+		nop; \
+		nop; \
+		nop; \
+		nop; \
+		nop; \
+		.asciz "barebox"; \
+		.word 0xffffffff; \
+		.word _barebox_image_size; \
+		.rept 8; \
+		.word 0x55555555; \
+		.endr; \
+		2:
+
+/*
+ * ENTRY_PROC_END - mark end of entry procedure
+ */
+#define ENTRY_PROC_END(name) \
+	END(##name)
+
+#endif /* _BAREBOX_ARM64_H_ */
-- 
2.19.1


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  parent reply	other threads:[~2018-11-28 11:21 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-28 11:20 [PATCH v2 0/4] Xilinx Zynq Ultrascale+ MPSoC support Michael Tretter
2018-11-28 11:20 ` [PATCH v2 1/4] ARM: lib64: .gitignore barebox.lds Michael Tretter
2018-11-28 11:20 ` [PATCH v2 2/4] ARM: aarch64: compile with general-regs-only Michael Tretter
2018-11-28 11:20 ` Michael Tretter [this message]
2018-11-28 11:20 ` [PATCH v2 4/4] ARM: zynqmp: add support for Xilinx ZCU104 board Michael Tretter
2018-11-28 13:13 ` [PATCH v2 0/4] Xilinx Zynq Ultrascale+ MPSoC support Antony Pavlov
2018-11-29  8:14   ` Sascha Hauer
2018-11-29  9:50     ` Roland Hieber
2018-11-29 10:37       ` Sascha Hauer
2018-12-07 10:11 ` [PATCH v3 " Michael Tretter
2018-12-07 10:11   ` [PATCH v3 1/4] ARM: lib64: .gitignore barebox.lds Michael Tretter
2018-12-07 10:11   ` [PATCH v3 2/4] ARM: aarch64: compile with general-regs-only Michael Tretter
2018-12-07 10:11   ` [PATCH v3 3/4] ARM: aarch64: add ENTRY_PROC macro for arm64 Michael Tretter
2018-12-07 10:11   ` [PATCH v3 4/4] ARM: zynqmp: add support for Xilinx ZCU104 board Michael Tretter
2018-12-10  9:13   ` [PATCH v3 0/4] Xilinx Zynq Ultrascale+ MPSoC support Sascha Hauer

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