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>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SYSDEP_X86_PTRACE_H
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#define __SYSDEP_X86_PTRACE_H
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#include <generated/user_constants.h>
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#include <sysdep/faultinfo.h>
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#define MAX_REG_OFFSET (UM_FRAME_SIZE)
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#define MAX_REG_NR ((MAX_REG_OFFSET) / sizeof(unsigned long))
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#define REGS_IP(r) ((r)[HOST_IP])
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#define REGS_SP(r) ((r)[HOST_SP])
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#define REGS_EFLAGS(r) ((r)[HOST_EFLAGS])
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#define REGS_AX(r) ((r)[HOST_AX])
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#define REGS_BX(r) ((r)[HOST_BX])
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#define REGS_CX(r) ((r)[HOST_CX])
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#define REGS_DX(r) ((r)[HOST_DX])
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#define REGS_SI(r) ((r)[HOST_SI])
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#define REGS_DI(r) ((r)[HOST_DI])
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#define REGS_BP(r) ((r)[HOST_BP])
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#define REGS_CS(r) ((r)[HOST_CS])
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#define REGS_SS(r) ((r)[HOST_SS])
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#define REGS_DS(r) ((r)[HOST_DS])
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#define REGS_ES(r) ((r)[HOST_ES])
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#define UPT_IP(r) REGS_IP((r)->gp)
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#define UPT_SP(r) REGS_SP((r)->gp)
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#define UPT_EFLAGS(r) REGS_EFLAGS((r)->gp)
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#define UPT_AX(r) REGS_AX((r)->gp)
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#define UPT_BX(r) REGS_BX((r)->gp)
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#define UPT_CX(r) REGS_CX((r)->gp)
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#define UPT_DX(r) REGS_DX((r)->gp)
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#define UPT_SI(r) REGS_SI((r)->gp)
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#define UPT_DI(r) REGS_DI((r)->gp)
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#define UPT_BP(r) REGS_BP((r)->gp)
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#define UPT_CS(r) REGS_CS((r)->gp)
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#define UPT_SS(r) REGS_SS((r)->gp)
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#define UPT_DS(r) REGS_DS((r)->gp)
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#define UPT_ES(r) REGS_ES((r)->gp)
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#ifdef __i386__
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#include "ptrace_32.h"
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#else
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#include "ptrace_64.h"
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#endif
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struct syscall_args {
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unsigned long args[6];
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};
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#define SYSCALL_ARGS(r) ((struct syscall_args) \
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{ .args = { UPT_SYSCALL_ARG1(r), \
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UPT_SYSCALL_ARG2(r), \
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UPT_SYSCALL_ARG3(r), \
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UPT_SYSCALL_ARG4(r), \
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UPT_SYSCALL_ARG5(r), \
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UPT_SYSCALL_ARG6(r) } } )
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extern unsigned long host_fp_size;
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struct uml_pt_regs {
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unsigned long gp[MAX_REG_NR];
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struct faultinfo faultinfo;
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long syscall;
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int is_user;
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/* Dynamically sized FP registers (holds an XSTATE) */
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unsigned long fp[];
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};
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#define EMPTY_UML_PT_REGS { }
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#define UPT_SYSCALL_NR(r) ((r)->syscall)
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#define UPT_FAULTINFO(r) (&(r)->faultinfo)
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#define UPT_IS_USER(r) ((r)->is_user)
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extern int user_context(unsigned long sp);
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extern int arch_init_registers(int pid);
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#endif /* __SYSDEP_X86_PTRACE_H */
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