xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

riscv: Implement copy_thread_tls

Browse Source 
This is required for clone3 which passes the TLS value through a
struct rather than a register.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: linux-riscv@lists.infradead.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-6-amanieu@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Amanieu d'Antras
2020-01-02 18:24:11 +01:00
committed by Christian Brauner
parent d2f36c787b
commit 20bda4ed62
2 changed files with 4 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/riscv/Kconfig
View File

@@ -65,6 +65,7 @@ config RISCV
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select HAVE_ARCH_MMAP_RND_BITS if MMU select HAVE_ARCH_MMAP_RND_BITS if MMU
select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GCOV_PROFILE_ALL
select HAVE_COPY_THREAD_TLS
config ARCH_MMAP_RND_BITS_MIN config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT default 18 if 64BIT

6
arch/riscv/kernel/process.c
View File

@@ -99,8 +99,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
return 0; return 0;
} }
int copy_thread(unsigned long clone_flags, unsigned long usp, int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p) unsigned long arg, struct task_struct *p, unsigned long tls)
{ {
struct pt_regs *childregs = task_pt_regs(p); struct pt_regs *childregs = task_pt_regs(p);
@@ -121,7 +121,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
if (usp) /* User fork */ if (usp) /* User fork */
childregs->sp = usp; childregs->sp = usp;
if (clone_flags & CLONE_SETTLS) if (clone_flags & CLONE_SETTLS)
childregs->tp = childregs->a5; childregs->tp = tls;
childregs->a0 = 0; /* Return value of fork() */ childregs->a0 = 0; /* Return value of fork() */
p->thread.ra = (unsigned long)ret_from_fork; p->thread.ra = (unsigned long)ret_from_fork;
} }