3f17fed214
The PTRACE_GETREGSET API has now existed since Linux 2.6.33. The XSAVE CPU feature should also be sufficiently common to be able to rely on it. With this, define our internal FP state to be the hosts XSAVE data. Add discovery for the hosts XSAVE size and place the FP registers at the end of task_struct so that we can adjust the size at runtime. Next we can implement the regset API on top and update the signal handling as well as ptrace APIs to use them. Also switch coredump creation to use the regset API and finally set HAVE_ARCH_TRACEHOOK. This considerably improves the signal frames. Previously they might not have contained all the registers (i386) and also did not have the sizes and magic values set to the correct values to permit userspace to decode the frame. As a side effect, this will permit UML to run on hosts with newer CPU extensions (such as AMX) that need even more register state. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20241023094120.4083426-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __UM_X86_PTRACE_H
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#define __UM_X86_PTRACE_H
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/* This is here because signal.c needs the REGSET_FP_LEGACY definition */
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enum {
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REGSET_GENERAL,
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#ifdef CONFIG_X86_32
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REGSET_FP_LEGACY,
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#endif
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REGSET_FP,
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REGSET_XSTATE,
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};
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#include <linux/compiler.h>
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#ifndef CONFIG_X86_32
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#define __FRAME_OFFSETS /* Needed to get the R* macros */
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#endif
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#include <asm/ptrace-generic.h>
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#define user_mode(r) UPT_IS_USER(&(r)->regs)
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#define PT_REGS_AX(r) UPT_AX(&(r)->regs)
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#define PT_REGS_BX(r) UPT_BX(&(r)->regs)
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#define PT_REGS_CX(r) UPT_CX(&(r)->regs)
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#define PT_REGS_DX(r) UPT_DX(&(r)->regs)
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#define PT_REGS_SI(r) UPT_SI(&(r)->regs)
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#define PT_REGS_DI(r) UPT_DI(&(r)->regs)
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#define PT_REGS_BP(r) UPT_BP(&(r)->regs)
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#define PT_REGS_EFLAGS(r) UPT_EFLAGS(&(r)->regs)
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#define PT_REGS_CS(r) UPT_CS(&(r)->regs)
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#define PT_REGS_SS(r) UPT_SS(&(r)->regs)
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#define PT_REGS_DS(r) UPT_DS(&(r)->regs)
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#define PT_REGS_ES(r) UPT_ES(&(r)->regs)
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#define PT_REGS_ORIG_SYSCALL(r) PT_REGS_AX(r)
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#define PT_REGS_SYSCALL_RET(r) PT_REGS_AX(r)
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#define PT_FIX_EXEC_STACK(sp) do ; while(0)
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#define profile_pc(regs) PT_REGS_IP(regs)
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#define UPT_RESTART_SYSCALL(r) (UPT_IP(r) -= 2)
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#define PT_REGS_SET_SYSCALL_RETURN(r, res) (PT_REGS_AX(r) = (res))
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static inline long regs_return_value(struct pt_regs *regs)
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{
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return PT_REGS_AX(regs);
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}
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/*
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* Forward declaration to avoid including sysdep/tls.h, which causes a
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* circular include, and compilation failures.
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*/
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struct user_desc;
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#ifdef CONFIG_X86_32
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extern int ptrace_get_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc);
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extern int ptrace_set_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc);
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extern int arch_switch_tls(struct task_struct *to);
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#else
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#define PT_REGS_R8(r) UPT_R8(&(r)->regs)
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#define PT_REGS_R9(r) UPT_R9(&(r)->regs)
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#define PT_REGS_R10(r) UPT_R10(&(r)->regs)
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#define PT_REGS_R11(r) UPT_R11(&(r)->regs)
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#define PT_REGS_R12(r) UPT_R12(&(r)->regs)
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#define PT_REGS_R13(r) UPT_R13(&(r)->regs)
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#define PT_REGS_R14(r) UPT_R14(&(r)->regs)
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#define PT_REGS_R15(r) UPT_R15(&(r)->regs)
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#include <asm/errno.h>
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static inline int ptrace_get_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc)
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{
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return -ENOSYS;
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}
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static inline int ptrace_set_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc)
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{
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return -ENOSYS;
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}
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extern long arch_prctl(struct task_struct *task, int option,
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unsigned long __user *addr);
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#endif
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#define user_stack_pointer(regs) PT_REGS_SP(regs)
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extern void arch_switch_to(struct task_struct *to);
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#endif /* __UM_X86_PTRACE_H */
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