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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_LINKAGE_H #define __ASM_LINKAGE_H #define __ALIGN .align 2 #define __ALIGN_STR __stringify(__ALIGN) #define SYM_FUNC_START(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ .cfi_startproc; #define SYM_FUNC_START_NOALIGN(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \ .cfi_startproc; #define SYM_FUNC_START_LOCAL(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \ .cfi_startproc; #define SYM_FUNC_START_LOCAL_NOALIGN(name) \ SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \ .cfi_startproc; #define SYM_FUNC_START_WEAK(name) \ SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \ .cfi_startproc; #define SYM_FUNC_START_WEAK_NOALIGN(name) \ SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ .cfi_startproc; #define SYM_FUNC_END(name) \ .cfi_endproc; \ SYM_END(name, SYM_T_FUNC) #define SYM_CODE_START(name) \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ .cfi_startproc; #define SYM_CODE_END(name) \ .cfi_endproc; \ SYM_END(name, SYM_T_NONE) /* * This is for the signal handler trampoline, which is used as the return * address of the signal handlers in userspace instead of called normally. * The long standing libgcc bug https://gcc.gnu.org/PR124050 requires a * nop between .cfi_startproc and the actual address of the trampoline, so * we cannot simply use SYM_FUNC_START. * * This wrapper also contains all the .cfi_* directives for recovering * the content of the GPRs and the "return address" (where the rt_sigreturn * syscall will jump to), assuming there is a struct rt_sigframe (where * a struct sigcontext containing those information we need to recover) at * $sp. The "DWARF for the LoongArch(TM) Architecture" manual states * column 0 is for $zero, but it does not make too much sense to * save/restore the hardware zero register. Repurpose this column here * for the return address (here it's not the content of $ra we cannot use * the default column 3). */ #define SYM_SIGFUNC_START(name) \ .cfi_startproc; \ .cfi_signal_frame; \ .cfi_def_cfa 3, RT_SIGFRAME_SC; \ .cfi_return_column 0; \ .cfi_offset 0, SC_PC; \ \ .irp num, 1, 2, 3, 4, 5, 6, 7, 8, \ 9, 10, 11, 12, 13, 14, 15, 16, \ 17, 18, 19, 20, 21, 22, 23, 24, \ 25, 26, 27, 28, 29, 30, 31; \ .cfi_offset \num, SC_REGS + \num * 8; \ .endr; \ \ nop; \ SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) #define SYM_SIGFUNC_END(name) SYM_FUNC_END(name) #endif