On Tue, Oct 19, 2021 at 11:45 AM Warner Losh <i...@bsdimp.com> wrote: > > Copy of the signal trampoline code for arm, as well as setup_sigtramp to > write it to the stack. > > Signed-off-by: Stacey Son <s...@freebsd.org> > Signed-off-by: Warner Losh <i...@bsdimp.com> > --- > bsd-user/arm/target_arch_sigtramp.h | 52 +++++++++++++++++++++++++++++ > 1 file changed, 52 insertions(+) > create mode 100644 bsd-user/arm/target_arch_sigtramp.h > > diff --git a/bsd-user/arm/target_arch_sigtramp.h > b/bsd-user/arm/target_arch_sigtramp.h > new file mode 100644 > index 0000000000..ed53d336ed > --- /dev/null > +++ b/bsd-user/arm/target_arch_sigtramp.h > @@ -0,0 +1,52 @@ > +/* > + * arm sysarch() system call emulation > + * > + * Copyright (c) 2013 Stacey D. Son > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, see <http://www.gnu.org/licenses/>. > + */ > + > +#ifndef _TARGET_ARCH_SIGTRAMP_H_ > +#define _TARGET_ARCH_SIGTRAMP_H_ > + > +/* Compare to arm/arm/locore.S ENTRY_NP(sigcode) */ > +static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc, > + unsigned sys_sigreturn) > +{ > + int i; > + uint32_t sys_exit = TARGET_FREEBSD_NR_exit; > + /* > + * The code has to load r7 manually rather than using > + * "ldr r7, =SYS_return to make sure the size of the > + * code is correct. > + */ > + uint32_t sigtramp_code[] = { > + /* 1 */ 0xE1A0000D, /* mov r0, sp */ > + /* 2 */ 0xE2800000 + sigf_uc, /* add r0, r0, #SIGF_UC */ > + /* 3 */ 0xE59F700C, /* ldr r7, [pc, #12] */ > + /* 4 */ 0xEF000000 + sys_sigreturn, /* swi (SYS_sigreturn) */ > + /* 5 */ 0xE59F7008, /* ldr r7, [pc, #8] */ > + /* 6 */ 0xEF000000 + sys_exit, /* swi (SYS_exit)*/ > + /* 7 */ 0xEAFFFFFA, /* b . -16 */ > + /* 8 */ sys_sigreturn, > + /* 9 */ sys_exit > + }; > + > + for (i = 0; i < 9; i++) { > + tswap32s(&sigtramp_code[i]); > + } > + > + return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE); > +} > +#endif /* _TARGET_ARCH_SIGTRAMP_H_ */ > -- > 2.32.0 >
Reviewed-by: Kyle Evans <kev...@freebsd.org>