diff options
Diffstat (limited to 'linux-user/host/sparc64/safe-syscall.inc.S')
| -rw-r--r-- | linux-user/host/sparc64/safe-syscall.inc.S | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/linux-user/host/sparc64/safe-syscall.inc.S b/linux-user/host/sparc64/safe-syscall.inc.S deleted file mode 100644 index f4b3c0f9ae..0000000000 --- a/linux-user/host/sparc64/safe-syscall.inc.S +++ /dev/null @@ -1,89 +0,0 @@ -/* - * safe-syscall.inc.S : host-specific assembly fragment - * to handle signals occurring at the same time as system calls. - * This is intended to be included by linux-user/safe-syscall.S - * - * Written by Richard Henderson <richard.henderson@linaro.org> - * Copyright (C) 2021 Linaro, Inc. - * - * This work is licensed under the terms of the GNU GPL, version 2 or later. - * See the COPYING file in the top-level directory. - */ - - .text - .balign 4 - - .register %g2, #scratch - .register %g3, #scratch - - .global safe_syscall_base - .global safe_syscall_start - .global safe_syscall_end - .type safe_syscall_base, @function - .type safe_syscall_start, @function - .type safe_syscall_end, @function - -#define STACK_BIAS 2047 -#define PARAM(N) STACK_BIAS + N*8 - - /* - * This is the entry point for making a system call. The calling - * convention here is that of a C varargs function with the - * first argument an 'int *' to the signal_pending flag, the - * second one the system call number (as a 'long'), and all further - * arguments being syscall arguments (also 'long'). - */ -safe_syscall_base: - .cfi_startproc - /* - * The syscall calling convention isn't the same as the C one: - * we enter with o0 == &signal_pending - * o1 == syscall number - * o2 ... o5, (stack) == syscall arguments - * and return the result in x0 - * and the syscall instruction needs - * g1 == syscall number - * o0 ... o5 == syscall arguments - * and returns the result in o0 - * Shuffle everything around appropriately. - */ - mov %o0, %g2 /* signal_pending pointer */ - mov %o1, %g1 /* syscall number */ - mov %o2, %o0 /* syscall arguments */ - mov %o3, %o1 - mov %o4, %o2 - mov %o5, %o3 - ldx [%sp + PARAM(6)], %o4 - ldx [%sp + PARAM(7)], %o5 - - /* - * This next sequence of code works in conjunction with the - * rewind_if_safe_syscall_function(). If a signal is taken - * and the interrupted PC is anywhere between 'safe_syscall_start' - * and 'safe_syscall_end' then we rewind it to 'safe_syscall_start'. - * The code sequence must therefore be able to cope with this, and - * the syscall instruction must be the final one in the sequence. - */ -safe_syscall_start: - /* if signal_pending is non-zero, don't do the call */ - lduw [%g2], %g3 - brnz,pn %g3, 2f - nop - ta 0x6d -safe_syscall_end: - /* code path for having successfully executed the syscall */ - bcs,pn %xcc, 1f - nop - ret - nop - - /* code path when we didn't execute the syscall */ -2: set QEMU_ERESTARTSYS, %o0 - - /* code path setting errno */ -1: mov %o7, %g1 - call safe_syscall_set_errno_tail - mov %g1, %o7 - - .cfi_endproc - .size safe_syscall_base, .-safe_syscall_base |