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>
20 lines
553 B
C
20 lines
553 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <generated/user_constants.h>
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#define PT_OFFSET(r) ((r) * sizeof(long))
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#define PT_SYSCALL_NR(regs) ((regs)[HOST_ORIG_AX])
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#define PT_SYSCALL_NR_OFFSET PT_OFFSET(HOST_ORIG_AX)
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#define PT_SYSCALL_RET_OFFSET PT_OFFSET(HOST_AX)
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#define REGS_IP_INDEX HOST_IP
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#define REGS_SP_INDEX HOST_SP
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/*
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* glibc before 2.27 does not include PTRACE_SYSEMU_SINGLESTEP in its enum,
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* ensure we have a definition by (re-)defining it here.
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*/
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#ifndef PTRACE_SYSEMU_SINGLESTEP
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#define PTRACE_SYSEMU_SINGLESTEP 32
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#endif
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