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authorWaldemar Brodkorb <wbx@openadk.org>2024-03-24 15:06:48 +0100
committerWaldemar Brodkorb <wbx@openadk.org>2024-03-28 16:29:08 +0100
commit1640c262dc63e2f8f43c0728dbe867c8fffe3e9d (patch)
tree9644711dbd72a85c0cf79e9a27ffc01dcc2be551
parent318858b4735dc38720be492cc30971ca1a1d55f8 (diff)
riscv64: implement Linuxthreads, from sorear
-rw-r--r--extra/Configs/Config.in2
-rw-r--r--libc/sysdeps/linux/riscv64/jmpbuf-unwind.h7
-rw-r--r--libpthread/linuxthreads/manager.c2
-rw-r--r--libpthread/linuxthreads/sysdeps/riscv64/pt-machine.h61
4 files changed, 65 insertions, 7 deletions
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 7d213e46e..2d1692ba5 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -164,6 +164,7 @@ config TARGET_ARCH_BITS
default 64 if TARGET_aarch64
default 64 if TARGET_ia64
default 64 if TARGET_powerpc64
+ default 64 if TARGET_riscv64
default 64 if TARGET_sparc64
default 64 if TARGET_x86_64
default 64 if TARGET_kvx
@@ -593,7 +594,6 @@ config UCLIBC_HAS_LINUXTHREADS
# linuxthreads need nanosleep()
select UCLIBC_HAS_REALTIME
depends on !TARGET_aarch64 && \
- !TARGET_riscv64 && \
!TARGET_riscv32 && \
!TARGET_metag
help
diff --git a/libc/sysdeps/linux/riscv64/jmpbuf-unwind.h b/libc/sysdeps/linux/riscv64/jmpbuf-unwind.h
index 2e5f37f10..fb5d65ddd 100644
--- a/libc/sysdeps/linux/riscv64/jmpbuf-unwind.h
+++ b/libc/sysdeps/linux/riscv64/jmpbuf-unwind.h
@@ -23,8 +23,8 @@
/* Test if longjmp to JMPBUF would unwind the frame
containing a local variable at ADDRESS. */
-#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
- ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
+#define _JMPBUF_UNWINDS(jmpbuf, address) \
+ ((void *) (address) < (void *) ((jmpbuf)[0].__sp))
#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
_JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
@@ -33,9 +33,6 @@ static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp (__jmp_buf regs)
{
uintptr_t sp = regs[0].__sp;
-#ifdef PTR_DEMANGLE
- PTR_DEMANGLE (sp);
-#endif
return sp;
}
diff --git a/libpthread/linuxthreads/manager.c b/libpthread/linuxthreads/manager.c
index 122997b10..73fd1dcdb 100644
--- a/libpthread/linuxthreads/manager.c
+++ b/libpthread/linuxthreads/manager.c
@@ -455,7 +455,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
* the kernel chokes on a non-aligned stack frame. Choose the lower
* available word boundary.
*/
- new_thread = ((pthread_descr) ((int)(new_thread_bottom + stacksize) & -sizeof(void*))) - 1;
+ new_thread = ((pthread_descr) ((long)(new_thread_bottom + stacksize) & -sizeof(void*))) - 1;
guardaddr = NULL;
guardsize = 0;
diff --git a/libpthread/linuxthreads/sysdeps/riscv64/pt-machine.h b/libpthread/linuxthreads/sysdeps/riscv64/pt-machine.h
new file mode 100644
index 000000000..d83057669
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/riscv64/pt-machine.h
@@ -0,0 +1,61 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H 1
+#include <features.h>
+
+#ifndef PT_EI
+# define PT_EI __extern_always_inline
+#endif
+
+#define HAS_COMPARE_AND_SWAP
+PT_EI int
+__compare_and_swap (long int *p, long int oldval, long int newval)
+{
+ long int ret, temp;
+
+ __asm__ __volatile__
+ ("/* Inline compare & swap */\n"
+ "1:\n\t"
+ "lr.d %1,%2\n\t"
+ "li %0,0\n\t"
+ "bne %1,%3,2f\n\t"
+ "li %0,1\n\t"
+ "sc.d %1,%4,%2\n\t"
+ "bnez %1,1b\n"
+ "2:\n\t"
+ "/* End compare & swap */"
+ : "=&r" (ret), "=&r" (temp), "+A" (*p)
+ : "r" (oldval), "r" (newval)
+ : "memory");
+
+ return ret;
+}
+
+extern long int testandset (int *spinlock);
+
+PT_EI long int
+testandset (int *spinlock)
+{
+ unsigned int old = 1;
+ int tmp = 1;
+
+ __asm__ __volatile__ (
+ "amoswap.w %0, %2, %1"
+ : "=r" (old), "+A" (*spinlock)
+ : "r" (tmp)
+ : "memory");
+
+ return old;
+}
+
+/* Get some notion of the current stack. Need not be exactly the top
+ of the stack, just something somewhere in the current frame. */
+#define CURRENT_STACK_FRAME stack_pointer
+register char * stack_pointer __asm__ ("sp");
+
+#else
+#error PT_MACHINE already defined
+#endif /* pt-machine.h */