diff options
| author | Benjamin Berg <benjamin.berg@intel.com> | 2024-09-13 16:38:45 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-10-10 13:03:55 +0300 |
| commit | 5a6951273e0e9dc0f79facf22281a8a731fb90b1 (patch) | |
| tree | e8b65704dc743bcfd211950bd7015f7972b745a4 /arch/um/include/shared | |
| parent | 865e3845eeaa21e9a62abc1361644e67124f1ec0 (diff) | |
| download | linux-5a6951273e0e9dc0f79facf22281a8a731fb90b1.tar.xz | |
um: always use the internal copy of the FP registers
When switching from userspace to the kernel, all registers including the
FP registers are copied into the kernel and restored later on. As such,
the true source for the FP register state is actually already in the
kernel and they should never be grabbed from the userspace process.
Change the various places to simply copy the data from the internal FP
register storage area. Note that on i386 the format of PTRACE_GETFPREGS
and PTRACE_GETFPXREGS is different enough that conversion would be
needed. With this patch, -EINVAL is returned if the non-native format is
requested.
The upside is, that this patchset fixes setting registers via ptrace
(which simply did not work before) as well as fixing setting floating
point registers using the mcontext on signal return on i386.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20240913133845.964292-1-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/include/shared')
| -rw-r--r-- | arch/um/include/shared/registers.h | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/um/include/shared/registers.h b/arch/um/include/shared/registers.h index a0450326521c..7d81b2339a48 100644 --- a/arch/um/include/shared/registers.h +++ b/arch/um/include/shared/registers.h @@ -8,12 +8,6 @@ #include <sysdep/ptrace.h> -extern int save_i387_registers(int pid, unsigned long *fp_regs); -extern int restore_i387_registers(int pid, unsigned long *fp_regs); -extern int save_fp_registers(int pid, unsigned long *fp_regs); -extern int restore_fp_registers(int pid, unsigned long *fp_regs); -extern int save_fpx_registers(int pid, unsigned long *fp_regs); -extern int restore_fpx_registers(int pid, unsigned long *fp_regs); extern int init_pid_registers(int pid); extern void get_safe_registers(unsigned long *regs, unsigned long *fp_regs); extern int get_fp_registers(int pid, unsigned long *regs); |