qemu/linux-user/x86_64/target_signal.h

#ifndef TARGET_SIGNAL_H
#define TARGET_SIGNAL_H

#include "cpu.h"

/* this struct defines a stack used during syscall handling */

typedef struct target_sigaltstack {
	abi_ulong ss_sp;
	abi_long ss_flags;
	abi_ulong ss_size;
} target_stack_t;


/*
 * sigaltstack controls
 */
#define TARGET_SS_ONSTACK	1
#define TARGET_SS_DISABLE	2

#define TARGET_MINSIGSTKSZ	2048
#define TARGET_SIGSTKSZ		8192

static inline abi_ulong get_sp_from_cpustate(CPUX86State *state)
{
    return state->regs[R_ESP];
}

#endif /* TARGET_SIGNAL_H */