diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2024-06-01 03:39:03 -0700 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@openadk.org> | 2024-06-04 16:40:42 +0200 |
| commit | 138274e92a01be8a98392489b1a2f497ab11c201 (patch) | |
| tree | f0be841a1e915e86d4215326a13654f8034632a4 /libc/sysdeps/linux/xtensa/sysdep.h | |
| parent | 8bb33a2e1f2baec2078581d77e181f1ead5f51aa (diff) | |
xtensa: add FDPIC support
This change implements Xtensa FDPIC ABI as specified in the first
version of the following document:
https://github.com/jcmvbkbc/xtensa-abi/blob/master/fdpic-xtensa.txt
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/xtensa/sysdep.h')
| -rw-r--r-- | libc/sysdeps/linux/xtensa/sysdep.h | 48 |
1 files changed, 45 insertions, 3 deletions
diff --git a/libc/sysdeps/linux/xtensa/sysdep.h b/libc/sysdeps/linux/xtensa/sysdep.h index 80b3f30fc..d05741027 100644 --- a/libc/sysdeps/linux/xtensa/sysdep.h +++ b/libc/sysdeps/linux/xtensa/sysdep.h @@ -75,13 +75,27 @@ #define LITERAL_POSITION .literal_position #undef JUMPTARGET -#ifdef __PIC__ +#if defined(__FDPIC__) +#define JUMPTARGET(name) name##@GOTOFFFUNCDESC +#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc) \ + l32i a11, funcdesc, 4; \ + l32i call_target, funcdesc, 0 + +#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget)\ + add call_target, got_base, jumptarget; \ + FDPIC_LOAD_FUNCDESC(call_target, call_target) + +#elif defined(__PIC__) /* The "@PLT" suffix is currently a no-op for non-shared linking, but it doesn't hurt to use it conditionally for PIC code in case that changes someday. */ #define JUMPTARGET(name) name##@PLT +#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc) +#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget) #else #define JUMPTARGET(name) name +#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc) +#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget) #endif #ifndef FRAMESIZE @@ -153,6 +167,21 @@ #if defined _LIBC_REENTRANT # if defined USE___THREAD +#ifdef __FDPIC__ +# define SYSCALL_ERROR_ERRNO errno +# define SYSCALL_ERROR_HANDLER \ +0: rur a4, THREADPTR; \ + movi a3, SYSCALL_ERROR_ERRNO@GOTTPOFF; \ + .reloc ., R_XTENSA_TLS_TPOFF_PTR, SYSCALL_ERROR_ERRNO; \ + add a3, a3, a11; \ + .reloc ., R_XTENSA_TLS_TPOFF_LOAD, SYSCALL_ERROR_ERRNO; \ + l32i a3, a3, 0; \ + neg a2, a2; \ + add a4, a4, a3; \ + s32i a2, a4, 0; \ + movi a2, -1; \ + j .Lpseudo_end; +#else # define SYSCALL_ERROR_ERRNO errno # define SYSCALL_ERROR_HANDLER \ 0: rur a4, THREADPTR; \ @@ -162,13 +191,14 @@ s32i a2, a4, 0; \ movi a2, -1; \ j .Lpseudo_end; +#endif # else /* !USE___THREAD */ #if defined(__XTENSA_WINDOWED_ABI__) # define SYSCALL_ERROR_HANDLER \ 0: neg a2, a2; \ mov a6, a2; \ - movi a4, __errno_location@PLT; \ + movi a4, JUMPTARGET(__errno_location); \ callx4 a4; \ s32i a2, a6, 0; \ movi a2, -1; \ @@ -179,7 +209,8 @@ addi a1, a1, -16; \ s32i a0, a1, 0; \ s32i a2, a1, 4; \ - movi a0, __errno_location@PLT; \ + movi a0, JUMPTARGET(__errno_location); \ + FDPIC_LOAD_JUMPTARGET(a0, a11, a0); \ callx0 a0; \ l32i a0, a1, 0; \ l32i a3, a1, 4; \ @@ -193,12 +224,23 @@ # endif /* !USE___THREAD */ #else /* !_LIBC_REENTRANT */ +#ifdef __FDPIC__ +#define SYSCALL_ERROR_HANDLER \ +0: movi a4, errno@GOT; \ + add a4, a4, a11; \ + l32i a4, a4, 0; \ + neg a2, a2; \ + s32i a2, a4, 0; \ + movi a2, -1; \ + j .Lpseudo_end; +#else #define SYSCALL_ERROR_HANDLER \ 0: movi a4, errno; \ neg a2, a2; \ s32i a2, a4, 0; \ movi a2, -1; \ j .Lpseudo_end; +#endif /* __FDPIC__ */ #endif /* _LIBC_REENTRANT */ #endif /* __ASSEMBLER__ */ |