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From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH v2 2/5] ARM: import setjmp implementation from U-Boot
Date: Mon, 20 Jan 2020 09:56:45 +0100	[thread overview]
Message-ID: <20200120085647.19784-2-r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <20200120085647.19784-1-r.czerwinski@pengutronix.de>

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
 arch/arm/include/asm/setjmp.h | 29 ++++++++++++++++++++++++++++
 arch/arm/lib32/setjmp.S       | 36 +++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 arch/arm/include/asm/setjmp.h
 create mode 100644 arch/arm/lib32/setjmp.S

diff --git a/arch/arm/include/asm/setjmp.h b/arch/arm/include/asm/setjmp.h
new file mode 100644
index 0000000000..62bac613d6
--- /dev/null
+++ b/arch/arm/include/asm/setjmp.h
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ * (C) Copyright 2016 Alexander Graf <agraf@suse.de>
+ */
+
+#ifndef _SETJMP_H_
+#define _SETJMP_H_	1
+
+#include <asm/types.h>
+
+/*
+ * This really should be opaque, but the EFI implementation wrongly
+ * assumes that a 'struct jmp_buf_data' is defined.
+ */
+struct jmp_buf_data {
+#if defined(__aarch64__)
+	u64  regs[13];
+#else
+	u32  regs[10];  /* r4-r9, sl, fp, sp, lr */
+#endif
+};
+
+typedef struct jmp_buf_data jmp_buf[1];
+
+int setjmp(jmp_buf jmp);
+void longjmp(jmp_buf jmp, int ret);
+
+#endif /* _SETJMP_H_ */
diff --git a/arch/arm/lib32/setjmp.S b/arch/arm/lib32/setjmp.S
new file mode 100644
index 0000000000..f0606a7f66
--- /dev/null
+++ b/arch/arm/lib32/setjmp.S
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) 2017 Theobroma Systems Design und Consulting GmbH
+ */
+
+#include <config.h>
+#include <asm/assembler.h>
+#include <linux/linkage.h>
+
+.pushsection .text.setjmp, "ax"
+ENTRY(setjmp)
+	/*
+	 * A subroutine must preserve the contents of the registers
+	 * r4-r8, r10, r11 (v1-v5, v7 and v8) and SP (and r9 in PCS
+	 * variants that designate r9 as v6).
+	 */
+	mov  ip, sp
+	stm  a1, {v1-v8, ip, lr}
+	mov  a1, #0
+	bx   lr
+ENDPROC(setjmp)
+.popsection
+
+.pushsection .text.longjmp, "ax"
+ENTRY(longjmp)
+	ldm  a1, {v1-v8, ip, lr}
+	mov  sp, ip
+	mov  a1, a2
+	/* If we were passed a return value of zero, return one instead */
+	cmp  a1, #0
+	bne  1f
+	mov  a1, #1
+1:
+	bx   lr
+ENDPROC(longjmp)
+.popsection
-- 
2.25.0


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  reply	other threads:[~2020-01-20  8:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-20  8:56 [PATCH v2 1/5] optee: move optee_verify_header() to common Rouven Czerwinski
2020-01-20  8:56 ` Rouven Czerwinski [this message]
2020-01-21  7:46   ` [PATCH v2 2/5] ARM: import setjmp implementation from U-Boot Sascha Hauer
2020-01-20  8:56 ` [PATCH v2 3/5] ARM: add optee early loading function Rouven Czerwinski
2020-01-20  8:56 ` [PATCH v2 4/5] ARM: mach-imx: test PL310 write access Rouven Czerwinski
2020-01-21  7:37   ` Sascha Hauer
2020-01-20  8:56 ` [PATCH v2 5/5] user: add documentation for OP-TEE loading Rouven Czerwinski

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