diff mbox series

[RFC,03/10] riscv: add initjmp()

Message ID 20250214140031.484344-4-jerome.forissier@linaro.org
State New
Headers show
Series Uthreads | expand

Commit Message

Jerome Forissier Feb. 14, 2025, 2 p.m. UTC 
Implement initjmp() for RISC-V.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
---
 arch/Kconfig                    |  1 +
 arch/riscv/include/asm/setjmp.h |  1 +
 arch/riscv/lib/setjmp.S         | 10 ++++++++++
 3 files changed, 12 insertions(+)
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Patch

diff --git a/arch/Kconfig b/arch/Kconfig
index 57695fada8d..b745222bfbe 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -152,6 +152,7 @@  config RISCV
 	bool "RISC-V architecture"
 	select CREATE_ARCH_SYMLINK
 	select HAVE_SETJMP
+	select HAVE_INITJMP
 	select SUPPORT_ACPI
 	select SUPPORT_LITTLE_ENDIAN
 	select SUPPORT_OF_CONTROL
diff --git a/arch/riscv/include/asm/setjmp.h b/arch/riscv/include/asm/setjmp.h
index 72383d43303..98ea157eb3b 100644
--- a/arch/riscv/include/asm/setjmp.h
+++ b/arch/riscv/include/asm/setjmp.h
@@ -21,5 +21,6 @@  typedef struct jmp_buf_data jmp_buf[1];
 
 int setjmp(jmp_buf jmp);
 void longjmp(jmp_buf jmp, int ret);
+int initjmp(jmp_buf jmp, void __noreturn (*func)(void), void *stack_top);
 
 #endif /* _SETJMP_H_ */
diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
index 99d6195827e..6f952a16eee 100644
--- a/arch/riscv/lib/setjmp.S
+++ b/arch/riscv/lib/setjmp.S
@@ -59,3 +59,13 @@  ENTRY(longjmp)
 	ret
 ENDPROC(longjmp)
 .popsection
+
+.pushsection .text.initjmp, "ax"
+ENTRY(initjmp)
+	/* a1: entry point address, a2: stack top */
+	STORE_IDX(a1, 12)
+	STORE_IDX(a2, 13)
+	li  a0, 0
+	ret
+ENDPROC(initjmp)
+.popsection