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/* SPDX-License-Identifier: GPL-2.0 / / * syscall_wrapper.h - x86 specific wrappers to syscall definitions / #ifndef _ASM_X86_SYSCALL_WRAPPER_H #define _ASM_X86_SYSCALL_WRAPPER_H struct pt_regs; / Mapping of registers to parameters for syscalls on x86-64 and x32 / #define SC_X86_64_REGS_TO_ARGS(x, ...) \ __MAP(x,__SC_ARGS \ ,,regs->di,,regs->si,,regs->dx \ ,,regs->r10,,regs->r8,,regs->r9) \ / SYSCALL_PT_ARGS is Adapted from s390x / #define SYSCALL_PT_ARG6(m, t1, t2, t3, t4, t5, t6) \ SYSCALL_PT_ARG5(m, t1, t2, t3, t4, t5), m(t6, (regs->bp)) #define SYSCALL_PT_ARG5(m, t1, t2, t3, t4, t5) \ SYSCALL_PT_ARG4(m, t1, t2, t3, t4), m(t5, (regs->di)) #define SYSCALL_PT_ARG4(m, t1, t2, t3, t4) \ SYSCALL_PT_ARG3(m, t1, t2, t3), m(t4, (regs->si)) #define SYSCALL_PT_ARG3(m, t1, t2, t3) \ SYSCALL_PT_ARG2(m, t1, t2), m(t3, (regs->dx)) #define SYSCALL_PT_ARG2(m, t1, t2) \ SYSCALL_PT_ARG1(m, t1), m(t2, (regs->cx)) #define SYSCALL_PT_ARG1(m, t1) m(t1, (regs->bx)) #define SYSCALL_PT_ARGS(x, ...) SYSCALL_PT_ARG##x(__VA_ARGS__) #define __SC_COMPAT_CAST(t, a) \ (__typeof(__builtin_choose_expr(__TYPE_IS_L(t), 0, 0U))) \ (unsigned int)a / Mapping of registers to parameters for syscalls on i386 / #define SC_IA32_REGS_TO_ARGS(x, ...) \ SYSCALL_PT_ARGS(x, __SC_COMPAT_CAST, \ __MAP(x, __SC_TYPE, __VA_ARGS__)) \ #ifdef CONFIG_IA32_EMULATION / * For IA32 emulation, we need to handle "compat" syscalls and create * additional wrappers (aptly named __ia32_sys_xyzzy) which decode the * ia32 regs in the proper order for shared or "common" syscalls. As some * syscalls may not be implemented, we need to expand COND_SYSCALL in * kernel/sys_ni.c and SYS_NI in kernel/time/posix-stubs.c to cover this * case as well. / #define __IA32_COMPAT_SYS_STUB0(x, name) \ asmlinkage long __ia32_compat_sys_##name(const struct pt_regs regs);\ ALLOW_ERROR_INJECTION(__ia32_compat_sys_##name, ERRNO); \ asmlinkage long __ia32_compat_sys_##name(const struct pt_regs regs)\ { \ return __se_compat_sys_##name(); \ } #define __IA32_COMPAT_SYS_STUBx(x, name, ...) \ asmlinkage long __ia32_compat_sys##name(const struct pt_regs regs);\ ALLOW_ERROR_INJECTION(__ia32_compat_sys##name, ERRNO); \ asmlinkage long __ia32_compat_sys##name(const struct pt_regs regs)\ { \ return __se_compat_sys##name(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));\ } #define __IA32_SYS_STUBx(x, name, ...) \ asmlinkage long __ia32_sys##name(const struct pt_regs regs); \ ALLOW_ERROR_INJECTION(__ia32_sys##name, ERRNO); \ asmlinkage long __ia32_sys##name(const struct pt_regs regs) \ { \ return __se_sys##name(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));\ } / * To keep the naming coherent, re-define SYSCALL_DEFINE0 to create an alias * named __ia32_sys_() / #define SYSCALL_DEFINE0(sname) \ SYSCALL_METADATA(_##sname, 0); \ asmlinkage long __x64_sys_##sname(const struct pt_regs __unused);\ ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \ SYSCALL_ALIAS(__ia32_sys_##sname, __x64_sys_##sname); \ asmlinkage long __x64_sys_##sname(const struct pt_regs __unused) #define COND_SYSCALL(name) \ asmlinkage __weak long __x64_sys_##name(const struct pt_regs __unused) \ { \ return sys_ni_syscall(); \ } \ asmlinkage __weak long __ia32_sys_##name(const struct pt_regs __unused)\ { \ return sys_ni_syscall(); \ } #define SYS_NI(name) \ SYSCALL_ALIAS(__x64_sys_##name, sys_ni_posix_timers); \ SYSCALL_ALIAS(__ia32_sys_##name, sys_ni_posix_timers) #else /* CONFIG_IA32_EMULATION / #define __IA32_COMPAT_SYS_STUBx(x, name, ...) #define __IA32_SYS_STUBx(x, fullname, name, ...) #endif / CONFIG_IA32_EMULATION / #ifdef CONFIG_X86_X32 / * For the x32 ABI, we need to create a stub for compat_sys_() which is aware of the x86-64-style parameter ordering of x32 syscalls. The syscalls common * with x86_64 obviously do not need such care. / #define __X32_COMPAT_SYS_STUB0(x, name, ...) \ asmlinkage long __x32_compat_sys_##name(const struct pt_regs regs);\ ALLOW_ERROR_INJECTION(__x32_compat_sys_##name, ERRNO); \ asmlinkage long __x32_compat_sys_##name(const struct pt_regs regs)\ { \ return __se_compat_sys_##name();\ } #define __X32_COMPAT_SYS_STUBx(x, name, ...) \ asmlinkage long __x32_compat_sys##name(const struct pt_regs regs);\ ALLOW_ERROR_INJECTION(__x32_compat_sys##name, ERRNO); \ asmlinkage long __x32_compat_sys##name(const struct pt_regs regs)\ { \ return __se_compat_sys##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\ } #else / CONFIG_X86_X32 / #define __X32_COMPAT_SYS_STUB0(x, name) #define __X32_COMPAT_SYS_STUBx(x, name, ...) #endif / CONFIG_X86_X32 / #ifdef CONFIG_COMPAT / * Compat means IA32_EMULATION and/or X86_X32. As they use a different * mapping of registers to parameters, we need to generate stubs for each * of them. / #define COMPAT_SYSCALL_DEFINE0(name) \ static long __se_compat_sys_##name(void); \ static inline long __do_compat_sys_##name(void); \ __IA32_COMPAT_SYS_STUB0(x, name) \ __X32_COMPAT_SYS_STUB0(x, name) \ static long __se_compat_sys_##name(void) \ { \ return __do_compat_sys_##name(); \ } \ static inline long __do_compat_sys_##name(void) #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \ static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\ __IA32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \ __X32_COMPAT_SYS_STUBx(x, name, __VA_ARGS__) \ static long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ { \ return __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\ } \ static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) / * As some compat syscalls may not be implemented, we need to expand * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in * kernel/time/posix-stubs.c to cover this case as well. / #define COND_SYSCALL_COMPAT(name) \ cond_syscall(__ia32_compat_sys_##name); \ cond_syscall(__x32_compat_sys_##name) #define COMPAT_SYS_NI(name) \ SYSCALL_ALIAS(__ia32_compat_sys_##name, sys_ni_posix_timers); \ SYSCALL_ALIAS(__x32_compat_sys_##name, sys_ni_posix_timers) #endif / CONFIG_COMPAT / / * Instead of the generic __SYSCALL_DEFINEx() definition, this macro takes * struct pt_regs regs as the only argument of the syscall stub named __x64_sys_(). It decodes just the registers it needs and passes them on to the __se_sys_() wrapper performing sign extension and then to the __do_sys_() function doing the actual job. These wrappers and functions are inlined (at least in very most cases), meaning that the assembly looks * as follows (slightly re-ordered for better readability): * * <__x64_sys_recv>: <-- syscall with 4 parameters * callq <__fentry__> * * mov 0x70(%rdi),%rdi <-- decode regs->di * mov 0x68(%rdi),%rsi <-- decode regs->si * mov 0x60(%rdi),%rdx <-- decode regs->dx * mov 0x38(%rdi),%rcx <-- decode regs->r10 * * xor %r9d,%r9d <-- clear %r9 * xor %r8d,%r8d <-- clear %r8 * * callq __sys_recvfrom <-- do the actual work in __sys_recvfrom() * which takes 6 arguments * * cltq <-- extend return value to 64-bit * retq <-- return * * This approach avoids leaking random user-provided register content down * the call chain. * * If IA32_EMULATION is enabled, this macro generates an additional wrapper * named __ia32_sys_() which decodes the struct pt_regs regs according * to the i386 calling convention (bx, cx, dx, si, di, bp). / #define __SYSCALL_DEFINEx(x, name, ...) \ asmlinkage long __x64_sys##name(const struct pt_regs regs); \ ALLOW_ERROR_INJECTION(__x64_sys##name, ERRNO); \ static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \ static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\ asmlinkage long __x64_sys##name(const struct pt_regs regs) \ { \ return __se_sys##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\ } \ __IA32_SYS_STUBx(x, name, __VA_ARGS__) \ static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ { \ long ret = __do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\ __MAP(x,__SC_TEST,__VA_ARGS__); \ __PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \ return ret; \ } \ static inline long __do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) / * As the generic SYSCALL_DEFINE0() macro does not decode any parameters for * obvious reasons, and passing struct pt_regs regs to it in %rdi does not hurt, we only need to re-define it here to keep the naming congruent to * SYSCALL_DEFINEx() -- which is essential for the COND_SYSCALL() and SYS_NI() * macros to work correctly. / #ifndef SYSCALL_DEFINE0 #define SYSCALL_DEFINE0(sname) \ SYSCALL_METADATA(_##sname, 0); \ asmlinkage long __x64_sys_##sname(const struct pt_regs __unused);\ ALLOW_ERROR_INJECTION(__x64_sys_##sname, ERRNO); \ asmlinkage long __x64_sys_##sname(const struct pt_regs __unused) #endif #ifndef COND_SYSCALL #define COND_SYSCALL(name) \ asmlinkage __weak long __x64_sys_##name(const struct pt_regs __unused) \ { \ return sys_ni_syscall(); \ } #endif #ifndef SYS_NI #define SYS_NI(name) SYSCALL_ALIAS(__x64_sys_##name, sys_ni_posix_timers); #endif /* * For VSYSCALLS, we need to declare these three syscalls with the new * pt_regs-based calling convention for in-kernel use. / asmlinkage long __x64_sys_getcpu(const struct pt_regs regs); asmlinkage long __x64_sys_gettimeofday(const struct pt_regs regs); asmlinkage long __x64_sys_time(const struct pt_regs regs); #endif /* _ASM_X86_SYSCALL_WRAPPER_H */

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