diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-11-17 16:14:00 +0100 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-12-20 10:12:24 -0800 |
| commit | bbf15aaf7c7506c88062288b3ae122b882f65e69 (patch) | |
| tree | 35c44f9cb40a66389e85da8afbb4fd65efc71af2 /linux-user/host/ppc64 | |
| parent | 2ac16d01e371ba9fb268f04249eaca9fafceb00b (diff) | |
common-user: Move safe-syscall.* from linux-user
Move linux-user safe-syscall.S and safe-syscall-error.c to common-user
so that bsd-user can also use it. Also move safe-syscall.h to
include/user/. Since there is nothing here that is related to the guest,
as opposed to the host, build it once.
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'linux-user/host/ppc64')
| -rw-r--r-- | linux-user/host/ppc64/safe-syscall.inc.S | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/linux-user/host/ppc64/safe-syscall.inc.S b/linux-user/host/ppc64/safe-syscall.inc.S deleted file mode 100644 index 69d3c70094..0000000000 --- a/linux-user/host/ppc64/safe-syscall.inc.S +++ /dev/null @@ -1,94 +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 <rth@twiddle.net> - * Copyright (C) 2016 Red Hat, 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. - */ - - .global safe_syscall_base - .global safe_syscall_start - .global safe_syscall_end - .type safe_syscall_base, @function - - .text - - /* 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'). - */ -#if _CALL_ELF == 2 -safe_syscall_base: - .cfi_startproc - .localentry safe_syscall_base,0 -#else - .section ".opd","aw" - .align 3 -safe_syscall_base: - .quad .L.safe_syscall_base,.TOC.@tocbase,0 - .previous -.L.safe_syscall_base: - .cfi_startproc -#endif - /* We enter with r3 == &signal_pending - * r4 == syscall number - * r5 ... r10 == syscall arguments - * and return the result in r3 - * and the syscall instruction needs - * r0 == syscall number - * r3 ... r8 == syscall arguments - * and returns the result in r3 - * Shuffle everything around appropriately. - */ - std 14, 16(1) /* Preserve r14 in SP+16 */ - .cfi_offset 14, 16 - mr 14, 3 /* signal_pending */ - mr 0, 4 /* syscall number */ - mr 3, 5 /* syscall arguments */ - mr 4, 6 - mr 5, 7 - mr 6, 8 - mr 7, 9 - mr 8, 10 - - /* 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 */ - lwz 12, 0(14) - cmpwi 0, 12, 0 - bne- 2f - sc -safe_syscall_end: - /* code path when we did execute the syscall */ - ld 14, 16(1) /* restore r14 */ - bso- 1f - blr - - /* code path when we didn't execute the syscall */ -2: ld 14, 16(1) /* restore r14 */ - addi 3, 0, QEMU_ERESTARTSYS - - /* code path setting errno */ -1: b safe_syscall_set_errno_tail - nop /* per abi, for the linker to modify */ - - .cfi_endproc - -#if _CALL_ELF == 2 - .size safe_syscall_base, .-safe_syscall_base -#else - .size safe_syscall_base, .-.L.safe_syscall_base - .size .L.safe_syscall_base, .-.L.safe_syscall_base -#endif |