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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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */ #include <linux/errno.h> #include <asm/asm.h> #include <asm/asmmacro.h> #include <asm/irqflags.h> #include <asm/mipsregs.h> #include <asm/regdef.h> #include <asm/stackframe.h> #include <asm/thread_info.h> #include <asm/unistd.h> #ifndef CONFIG_MIPS32_O32 /* No O32, so define handle_sys here */ #define handle_sysn32 handle_sys #endif .align 5 NESTED(handle_sysn32, PT_SIZE, sp) #ifndef CONFIG_MIPS32_O32 .set noat SAVE_SOME TRACE_IRQS_ON_RELOAD STI .set at #endif dsubu t0, v0, __NR_N32_Linux # check syscall number sltiu t0, t0, __NR_N32_Linux_syscalls #ifndef CONFIG_MIPS32_O32 ld t1, PT_EPC(sp) # skip syscall on return daddiu t1, 4 # skip to next instruction sd t1, PT_EPC(sp) #endif beqz t0, not_n32_scall sd a3, PT_R26(sp) # save a3 for syscall restarting li t1, _TIF_WORK_SYSCALL_ENTRY LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? and t0, t1, t0 bnez t0, n32_syscall_trace_entry syscall_common: dsll t0, v0, 3 # offset into table ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0) jalr t2 # Do The Real Thing (TM) li t0, -EMAXERRNO - 1 # error? sltu t0, t0, v0 sd t0, PT_R7(sp) # set error flag beqz t0, 1f ld t1, PT_R2(sp) # syscall number dnegu v0 # error sd t1, PT_R0(sp) # save it for syscall restarting 1: sd v0, PT_R2(sp) # result j syscall_exit_partial /* ------------------------------------------------------------------------ */ n32_syscall_trace_entry: SAVE_STATIC move a0, sp move a1, v0 jal syscall_trace_enter bltz v0, 1f # seccomp failed? Skip syscall RESTORE_STATIC ld v0, PT_R2(sp) # Restore syscall (maybe modified) ld a0, PT_R4(sp) # Restore argument registers ld a1, PT_R5(sp) ld a2, PT_R6(sp) ld a3, PT_R7(sp) ld a4, PT_R8(sp) ld a5, PT_R9(sp) dsubu t2, v0, __NR_N32_Linux # check (new) syscall number sltiu t0, t2, __NR_N32_Linux_syscalls beqz t0, not_n32_scall j syscall_common 1: j syscall_exit not_n32_scall: /* This is not an n32 compatibility syscall, pass it on to the n64 syscall handlers. */ j handle_sys64 END(handle_sysn32) #define __SYSCALL(nr, entry) PTR_WD entry .type sysn32_call_table, @object EXPORT(sysn32_call_table) #include <asm/syscall_table_n32.h> |