diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-09-29 09:05:39 -0400 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2021-10-01 12:03:48 +0200 |
| commit | 5125aced7cd291ba232944bf980612f905e524a0 (patch) | |
| tree | c9b36d7719939df0366bfc09970cbdf51e7c888d /linux-user/m68k | |
| parent | db2055415959bcc81cd6c2f0aa2c23e5f12c1eb6 (diff) | |
linux-user/m68k: Implement setup_sigtramp
Create and record the two signal trampolines.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-13-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/m68k')
| -rw-r--r-- | linux-user/m68k/signal.c | 47 | ||||
| -rw-r--r-- | linux-user/m68k/target_signal.h | 2 |
2 files changed, 24 insertions, 25 deletions
diff --git a/linux-user/m68k/signal.c b/linux-user/m68k/signal.c index 4f8eb6f727..ec33482e14 100644 --- a/linux-user/m68k/signal.c +++ b/linux-user/m68k/signal.c @@ -39,7 +39,6 @@ struct target_sigframe int sig; int code; abi_ulong psc; - char retcode[8]; abi_ulong extramask[TARGET_NSIG_WORDS-1]; struct target_sigcontext sc; }; @@ -76,7 +75,6 @@ struct target_rt_sigframe int sig; abi_ulong pinfo; abi_ulong puc; - char retcode[8]; struct target_siginfo info; struct target_ucontext uc; }; @@ -130,7 +128,6 @@ void setup_frame(int sig, struct target_sigaction *ka, { struct target_sigframe *frame; abi_ulong frame_addr; - abi_ulong retcode_addr; abi_ulong sc_addr; int i; @@ -152,16 +149,7 @@ void setup_frame(int sig, struct target_sigaction *ka, } /* Set up to return from userspace. */ - - retcode_addr = frame_addr + offsetof(struct target_sigframe, retcode); - __put_user(retcode_addr, &frame->pretcode); - - /* moveq #,d0; trap #0 */ - - __put_user(0x70004e40 + (TARGET_NR_sigreturn << 16), - (uint32_t *)(frame->retcode)); - - /* Set up to return from userspace */ + __put_user(default_sigreturn, &frame->pretcode); env->aregs[7] = frame_addr; env->pc = ka->_sa_handler; @@ -288,7 +276,6 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, { struct target_rt_sigframe *frame; abi_ulong frame_addr; - abi_ulong retcode_addr; abi_ulong info_addr; abi_ulong uc_addr; int err = 0; @@ -325,17 +312,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, } /* Set up to return from userspace. */ - - retcode_addr = frame_addr + offsetof(struct target_sigframe, retcode); - __put_user(retcode_addr, &frame->pretcode); - - /* moveq #,d0; notb d0; trap #0 */ - - __put_user(0x70004600 + ((TARGET_NR_rt_sigreturn ^ 0xff) << 16), - (uint32_t *)(frame->retcode + 0)); - __put_user(0x4e40, (uint16_t *)(frame->retcode + 4)); - - /* Set up to return from userspace */ + __put_user(default_rt_sigreturn, &frame->pretcode); env->aregs[7] = frame_addr; env->pc = ka->_sa_handler; @@ -411,3 +388,23 @@ badframe: force_sig(TARGET_SIGSEGV); return -TARGET_QEMU_ESIGRETURN; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + void *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 + 6, 0); + assert(tramp != NULL); + + default_sigreturn = sigtramp_page; + + /* moveq #,d0; trap #0 */ + __put_user(0x70004e40 + (TARGET_NR_sigreturn << 16), (uint32_t *)tramp); + + default_rt_sigreturn = sigtramp_page + 4; + + /* moveq #,d0; notb d0; trap #0 */ + __put_user(0x70004600 + ((TARGET_NR_rt_sigreturn ^ 0xff) << 16), + (uint32_t *)(tramp + 4)); + __put_user(0x4e40, (uint16_t *)(tramp + 8)); + + unlock_user(tramp, sigtramp_page, 4 + 6); +} diff --git a/linux-user/m68k/target_signal.h b/linux-user/m68k/target_signal.h index d096544ef8..94157bf1f4 100644 --- a/linux-user/m68k/target_signal.h +++ b/linux-user/m68k/target_signal.h @@ -22,4 +22,6 @@ typedef struct target_sigaltstack { #include "../generic/signal.h" #define TARGET_ARCH_HAS_SETUP_FRAME +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* M68K_TARGET_SIGNAL_H */ |