[PATCH 0/2] riscv: simply longjmp()

[PATCH 0/2] riscv: simply longjmp()

[Heinrich Schuchardt]

The implementation of longjmp() is simplified.
A unit test for longjmp() is provided.

For testing use

    CONFIG_UNIT_TEST=y
    CONFIG_CMD_SETEXPR=n

and execute

    ut lib

Heinrich Schuchardt (2):
  riscv: simply longjmp
  test: unit test for longjmp

 arch/riscv/lib/setjmp.S |  8 ++------
 test/lib/Makefile       |  1 +
 test/lib/longjmp.c      | 45 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 6 deletions(-)
 create mode 100644 test/lib/longjmp.c

--
2.30.2

[PATCH 1/2] riscv: simply longjmp

[Heinrich Schuchardt]

The value returned by setjmp must be nonzero. If zero is passed as
parameter it must be replaced by 1.

This patch reduces the code size a bit.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
 arch/riscv/lib/setjmp.S | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
index 72bc9241f6..99d6195827 100644
--- a/arch/riscv/lib/setjmp.S
+++ b/arch/riscv/lib/setjmp.S
@@ -54,12 +54,8 @@ ENTRY(longjmp)
 	LOAD_IDX(sp, 13)

 	/* Move the return value in place, but return 1 if passed 0. */
-	beq a1, zero, longjmp_1
-	mv a0, a1
-	ret
-
-	longjmp_1:
-	li a0, 1
+	seqz a0, a1
+	add a0, a0, a1
 	ret
 ENDPROC(longjmp)
 .popsection
--
2.30.2

[PATCH 2/2] test: unit test for longjmp

[Heinrich Schuchardt]

Provide a unit test for the longjmp() library function

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
 test/lib/Makefile  |  1 +
 test/lib/longjmp.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 test/lib/longjmp.c

diff --git a/test/lib/Makefile b/test/lib/Makefile
index 97c11e35a8..a30f615aa9 100644
--- a/test/lib/Makefile
+++ b/test/lib/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_EFI_LOADER) += efi_device_path.o
 obj-$(CONFIG_EFI_SECURE_BOOT) += efi_image_region.o
 obj-y += hexdump.o
 obj-y += lmb.o
+obj-y += longjmp.o
 obj-$(CONFIG_CONSOLE_RECORD) += test_print.o
 obj-$(CONFIG_SSCANF) += sscanf.o
 obj-y += string.o
diff --git a/test/lib/longjmp.c b/test/lib/longjmp.c
new file mode 100644
index 0000000000..7571540ffc
--- /dev/null
+++ b/test/lib/longjmp.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Test setjmp(), longjmp()
+ *
+ * Copyright (c) 2021, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ */
+
+#include <common.h>
+#include <test/lib.h>
+#include <test/test.h>
+#include <test/ut.h>
+#include <asm/setjmp.h>
+
+/**
+ * test_longjmp_ret() - get longjmp() return value
+ *
+ * @i:		value passed to longjmp()
+ * Return:	value returned by longjmp()
+ */
+int test_longjmp_ret(int i)
+{
+	jmp_buf env;
+	int ret;
+
+	ret = setjmp(env);
+	if (ret)
+		return ret;
+	longjmp(env, i);
+	/* We should not arrive here */
+	return 0x1000;
+}
+
+static int lib_test_longjmp(struct unit_test_state *uts)
+{
+	int i;
+
+	for (i = -3; i < 0; ++i)
+		ut_asserteq(i, test_longjmp_ret(i));
+	ut_asserteq(1, test_longjmp_ret(0));
+	for (i = 1; i < 4; ++i)
+		ut_asserteq(i, test_longjmp_ret(i));
+	return 0;
+}
+LIB_TEST(lib_test_longjmp, 0);
--
2.30.2

[PATCH 1/2] riscv: simply longjmp

[Sean Anderson]

On 3/21/21 6:19 AM, Heinrich Schuchardt wrote:
> The value returned by setjmp must be nonzero. If zero is passed as
> parameter it must be replaced by 1.
> 
> This patch reduces the code size a bit.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> ---
>   arch/riscv/lib/setjmp.S | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
> index 72bc9241f6..99d6195827 100644
> --- a/arch/riscv/lib/setjmp.S
> +++ b/arch/riscv/lib/setjmp.S
> @@ -54,12 +54,8 @@ ENTRY(longjmp)
>   	LOAD_IDX(sp, 13)
> 
>   	/* Move the return value in place, but return 1 if passed 0. */
> -	beq a1, zero, longjmp_1
> -	mv a0, a1
> -	ret
> -
> -	longjmp_1:
> -	li a0, 1
> +	seqz a0, a1
> +	add a0, a0, a1
>   	ret
>   ENDPROC(longjmp)
>   .popsection
> --
> 2.30.2
> 

Reviewed-by: Sean Anderson <seanga2@gmail.com>

[PATCH 1/2] riscv: simply longjmp

[Heinrich Schuchardt]

On 22.03.21 05:56, Sean Anderson wrote:
> On 3/21/21 6:19 AM, Heinrich Schuchardt wrote:
>> The value returned by setjmp must be nonzero. If zero is passed as
>> parameter it must be replaced by 1.
>>
>> This patch reduces the code size a bit.
>>
>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
>> ---
>> ? arch/riscv/lib/setjmp.S | 8 ++------
>> ? 1 file changed, 2 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
>> index 72bc9241f6..99d6195827 100644
>> --- a/arch/riscv/lib/setjmp.S
>> +++ b/arch/riscv/lib/setjmp.S
>> @@ -54,12 +54,8 @@ ENTRY(longjmp)
>> ????? LOAD_IDX(sp, 13)
>>
>> ????? /* Move the return value in place, but return 1 if passed 0. */
>> -??? beq a1, zero, longjmp_1
>> -??? mv a0, a1
>> -??? ret
>> -
>> -??? longjmp_1:
>> -??? li a0, 1
>> +??? seqz a0, a1
>> +??? add a0, a0, a1
>> ????? ret
>> ? ENDPROC(longjmp)
>> ? .popsection
>> --
>> 2.30.2
>>
>
> Reviewed-by: Sean Anderson <seanga2@gmail.com>

The title should be corrected to "Simplify longjmp".