diff options
Diffstat (limited to 'src/thread/aarch64')
| -rw-r--r-- | src/thread/aarch64/__set_thread_area.c | 27 | ||||
| -rw-r--r-- | src/thread/aarch64/__set_thread_area.s | 7 | ||||
| -rw-r--r-- | src/thread/aarch64/clone.s | 3 |
3 files changed, 29 insertions, 8 deletions
diff --git a/src/thread/aarch64/__set_thread_area.c b/src/thread/aarch64/__set_thread_area.c new file mode 100644 index 00000000..2ec788e8 --- /dev/null +++ b/src/thread/aarch64/__set_thread_area.c @@ -0,0 +1,27 @@ +#include <elf.h> +#include "libc.h" + +#define BITRANGE(a,b) (2*(1UL<<(b))-(1UL<<(a))) + +int __set_thread_area(void *p) +{ + __asm__ __volatile__ ("msr tpidr_el0,%0" : : "r"(p) : "memory"); + + /* Mask off hwcap bits for SME and unknown future features. This is + * necessary because SME is not safe to use without libc support for + * it, and we do not (yet) have such support. */ + for (size_t *v = libc.auxv; *v; v+=2) { + if (v[0]==AT_HWCAP) { + v[1] &= ~BITRANGE(42,63); /* 42-47 are SME */ + } else if (v[0]==AT_HWCAP2) { + v[1] &= ~(BITRANGE(23,30) + | BITRANGE(37,42) + | BITRANGE(57,62)); + } else if (v[0]==AT_HWCAP3 || v[0]==AT_HWCAP4) { + v[0] = AT_IGNORE; + v[1] = 0; + } + } + + return 0; +} diff --git a/src/thread/aarch64/__set_thread_area.s b/src/thread/aarch64/__set_thread_area.s deleted file mode 100644 index fd0df34b..00000000 --- a/src/thread/aarch64/__set_thread_area.s +++ /dev/null @@ -1,7 +0,0 @@ -.global __set_thread_area -.hidden __set_thread_area -.type __set_thread_area,@function -__set_thread_area: - msr tpidr_el0,x0 - mov w0,#0 - ret diff --git a/src/thread/aarch64/clone.s b/src/thread/aarch64/clone.s index e3c83395..aff8155b 100644 --- a/src/thread/aarch64/clone.s +++ b/src/thread/aarch64/clone.s @@ -24,7 +24,8 @@ __clone: // parent ret // child -1: ldp x1,x0,[sp],#16 +1: mov x29, 0 + ldp x1,x0,[sp],#16 blr x1 mov x8,#93 // SYS_exit svc #0 |