diff options
| author | Benjamin Berg <benjamin.berg@intel.com> | 2024-07-03 15:45:31 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-07-03 17:09:49 +0200 |
| commit | a5d2cfe749e2917266956751262328da35e0925d (patch) | |
| tree | c228ff494ebdd8b2210c46289a5025bce125661e /arch/x86/um/shared/sysdep | |
| parent | um: remove LDT support (diff) | |
| download | linux-a5d2cfe749e2917266956751262328da35e0925d.tar.gz linux-a5d2cfe749e2917266956751262328da35e0925d.zip | |
um: remove copy_context_skas0
The kernel flushes the memory ranges anyway for CoW and does not assume
that the userspace process has anything set up already. So, start with a
fresh process for the new mm context.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240703134536.1161108-8-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/x86/um/shared/sysdep')
| -rw-r--r-- | arch/x86/um/shared/sysdep/stub.h | 1 | ||||
| -rw-r--r-- | arch/x86/um/shared/sysdep/stub_32.h | 24 | ||||
| -rw-r--r-- | arch/x86/um/shared/sysdep/stub_64.h | 26 |
3 files changed, 0 insertions, 51 deletions
diff --git a/arch/x86/um/shared/sysdep/stub.h b/arch/x86/um/shared/sysdep/stub.h index 579681d12158..dc89f4423454 100644 --- a/arch/x86/um/shared/sysdep/stub.h +++ b/arch/x86/um/shared/sysdep/stub.h @@ -13,4 +13,3 @@ extern void stub_segv_handler(int, siginfo_t *, void *); extern void stub_syscall_handler(void); -extern void stub_clone_handler(void); diff --git a/arch/x86/um/shared/sysdep/stub_32.h b/arch/x86/um/shared/sysdep/stub_32.h index ab08a69fb57f..0b44a86dd346 100644 --- a/arch/x86/um/shared/sysdep/stub_32.h +++ b/arch/x86/um/shared/sysdep/stub_32.h @@ -107,30 +107,6 @@ static __always_inline void trap_myself(void) __asm("int3"); } -static __always_inline void remap_stack_and_trap(void) -{ - __asm__ volatile ( - "movl %%esp,%%ebx ;" - "andl %0,%%ebx ;" - "movl %1,%%eax ;" - "movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;" - "movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;" - "int $0x80 ;" - "addl %4,%%ebx ; movl %%eax, (%%ebx) ;" - "int $3" - : : - "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)), - "g" (STUB_MMAP_NR), - "g" (offsetof(struct stub_data, fd)), - "g" (offsetof(struct stub_data, offset)), - "g" (offsetof(struct stub_data, child_err)), - "c" (STUB_DATA_PAGES * UM_KERN_PAGE_SIZE), - "d" (PROT_READ | PROT_WRITE), - "S" (MAP_FIXED | MAP_SHARED) - : - "memory"); -} - static __always_inline void *get_stub_data(void) { unsigned long ret; diff --git a/arch/x86/um/shared/sysdep/stub_64.h b/arch/x86/um/shared/sysdep/stub_64.h index d27b34d75d70..67f44284f1aa 100644 --- a/arch/x86/um/shared/sysdep/stub_64.h +++ b/arch/x86/um/shared/sysdep/stub_64.h @@ -101,32 +101,6 @@ static __always_inline void trap_myself(void) __asm("int3"); } -static __always_inline void remap_stack_and_trap(void) -{ - __asm__ volatile ( - "movq %0,%%rax ;" - "movq %%rsp,%%rdi ;" - "andq %1,%%rdi ;" - "movq %2,%%r10 ;" - "movq %%rdi,%%r8 ; addq %3,%%r8 ; movq (%%r8),%%r8 ;" - "movq %%rdi,%%r9 ; addq %4,%%r9 ; movq (%%r9),%%r9 ;" - __syscall ";" - "movq %%rsp,%%rdi ; andq %1,%%rdi ;" - "addq %5,%%rdi ; movq %%rax, (%%rdi) ;" - "int3" - : : - "g" (STUB_MMAP_NR), - "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)), - "g" (MAP_FIXED | MAP_SHARED), - "g" (offsetof(struct stub_data, fd)), - "g" (offsetof(struct stub_data, offset)), - "g" (offsetof(struct stub_data, child_err)), - "S" (STUB_DATA_PAGES * UM_KERN_PAGE_SIZE), - "d" (PROT_READ | PROT_WRITE) - : - __syscall_clobber, "r10", "r8", "r9"); -} - static __always_inline void *get_stub_data(void) { unsigned long ret; |