| Message ID | 20240617185804.25075-18-itachis@FreeBSD.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ARM AArch64 Support for BSD | expand |
On 6/17/24 11:57, Ajeet Singh wrote: > From: Stacey Son <sson@FreeBSD.org> > > signal trampoline function initializes a sequence of instructions > to handle signal returns and exits, and copies this code to the target offset. > > Signed-off-by: Stacey Son <sson@FreeBSD.org> > Signed-off-by: Ajeet Singh <itachis@FreeBSD.org> > --- > bsd-user/aarch64/target_arch_sigtramp.h | 48 +++++++++++++++++++++++++ > 1 file changed, 48 insertions(+) > create mode 100644 bsd-user/aarch64/target_arch_sigtramp.h > > diff --git a/bsd-user/aarch64/target_arch_sigtramp.h b/bsd-user/aarch64/target_arch_sigtramp.h > new file mode 100644 > index 0000000000..8cdd33b621 > --- /dev/null > +++ b/bsd-user/aarch64/target_arch_sigtramp.h > @@ -0,0 +1,48 @@ > +/* > + * ARM AArch64 sigcode for bsd-user > + * > + * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD> > + * > + * This library is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2 of the License, or (at your option) any later version. > + * > + * This library 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 > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with this library; if not, see <http://www.gnu.org/licenses/>. > + */ > + > +#ifndef TARGET_ARCH_SIGTRAMP_H > +#define TARGET_ARCH_SIGTRAMP_H > + > +/* Compare to ENTRY(sigcode) in arm64/arm64/locore.S */ > +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; > + > + uint32_t sigtramp_code[] = { > + /* 1 */ 0x910003e0, /* mov x0, sp */ > + /* 2 */ 0x91000000 + (sigf_uc << 10), /* add x0, x0, #SIGF_UC */ > + /* 3 */ 0xd2800000 + (sys_sigreturn << 5) + 0x8, /* mov x8, #SYS_sigreturn */ > + /* 4 */ 0xd4000001, /* svc #0 */ > + /* 5 */ 0xd2800028 + (sys_exit << 5) + 0x8, /* mov x8, #SYS_exit */ > + /* 6 */ 0xd4000001, /* svc #0 */ > + /* 7 */ 0x17fffffc, /* b -4 */ > + /* 8 */ sys_sigreturn, > + /* 9 */ sys_exit > + }; > + > + for (i = 0; i < 9; i++) { > + tswap32s(&sigtramp_code[i]); > + } You can use const_le32() to initialize sigtramp_code[], at which point it can be static const. I'll note that bsd-user/arm/ could be improved the same way. In addition, the g_assert in arm/ can be QEMU_BUILD_BUG_ON instead, to be caught at compile-time. r~
diff --git a/bsd-user/aarch64/target_arch_sigtramp.h b/bsd-user/aarch64/target_arch_sigtramp.h new file mode 100644 index 0000000000..8cdd33b621 --- /dev/null +++ b/bsd-user/aarch64/target_arch_sigtramp.h @@ -0,0 +1,48 @@ +/* + * ARM AArch64 sigcode for bsd-user + * + * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef TARGET_ARCH_SIGTRAMP_H +#define TARGET_ARCH_SIGTRAMP_H + +/* Compare to ENTRY(sigcode) in arm64/arm64/locore.S */ +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; + + uint32_t sigtramp_code[] = { + /* 1 */ 0x910003e0, /* mov x0, sp */ + /* 2 */ 0x91000000 + (sigf_uc << 10), /* add x0, x0, #SIGF_UC */ + /* 3 */ 0xd2800000 + (sys_sigreturn << 5) + 0x8, /* mov x8, #SYS_sigreturn */ + /* 4 */ 0xd4000001, /* svc #0 */ + /* 5 */ 0xd2800028 + (sys_exit << 5) + 0x8, /* mov x8, #SYS_exit */ + /* 6 */ 0xd4000001, /* svc #0 */ + /* 7 */ 0x17fffffc, /* b -4 */ + /* 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 */