diff options
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/swapcontext.S | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/swapcontext.S b/sysdeps/unix/sysv/linux/aarch64/swapcontext.S index d30c543e6f..f8c66f0ef0 100644 --- a/sysdeps/unix/sysv/linux/aarch64/swapcontext.S +++ b/sysdeps/unix/sysv/linux/aarch64/swapcontext.S @@ -28,8 +28,12 @@ .text ENTRY(__swapcontext) DELOUSE (0) - /* Set the value returned when swapcontext() returns in this context. */ - str xzr, [x0, oX0 + 0 * SZREG] + /* Set the value returned when swapcontext() returns in this context. + And set up x1 to become the return address of the caller, so we + can return there with a normal RET instead of an indirect jump. */ + stp xzr, x30, [x0, oX0 + 0 * SZREG] + /* Arrange the oucp context to return to 2f. */ + adr x30, 2f stp x18, x19, [x0, oX0 + 18 * SZREG] stp x20, x21, [x0, oX0 + 20 * SZREG] @@ -97,5 +101,11 @@ ENTRY(__swapcontext) 1: b C_SYMBOL_NAME(__syscall_error) +2: + /* The oucp context is restored here via an indirect branch, + x1 must be restored too which has the real return address. */ + BTI_J + mov x30, x1 + RET PSEUDO_END (__swapcontext) weak_alias (__swapcontext, swapcontext) |