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/*
* Copyright (c) 2017-2021 Dmitry V. Levin <ldv@strace.io>
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "rt_sigframe.h"
/* see further comments in GDB: gdb/hppa-linux-tdep.c */
#define SIGFRAME 64
FUNC_GET_RT_SIGFRAME_ADDR
{
unsigned long sp, ip;
if (!get_instruction_pointer(tcp, &ip) ||
!get_stack_pointer(tcp, &sp))
return 0;
sp &= -1UL;
/* check if ip is part of stack, running in tramp[] of rt_sigframe */
if ((sp - ip) < 1024) {
/* on executable stack: We execute in tramp[], so align down. */
return (ip & -SIGFRAME)
/* compensate for size difference old and new frame */
+ sizeof(struct_rt_sigframe_old)
- sizeof(struct_rt_sigframe);
} else {
/* running in VDSO on kernel >= 5.18 */
static kernel_ulong_t context_offset;
/* read sigframe offset from kernel VDSO header */
if (!context_offset)
context_offset = ptrace(PTRACE_PEEKTEXT, (pid_t) tcp->pid,
(void *)(ip & -SIGFRAME), 0);
if (context_offset == (kernel_ulong_t) -1)
return 0;
/* context_offset is a negative value */
return sp + context_offset - offsetof(struct_rt_sigframe, uc.uc_mcontext);
}
}
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