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authorWaldemar Brodkorb <wbx@openadk.org>2017-05-24 20:49:02 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-06-23 23:46:04 +0200
commit041cdc2769407c4d3869b218ad7ee7638e1c306e (patch)
tree1ea25250d74dcb230cf5feee99226fc080dbd678 /libc/sysdeps/linux/sparc64/sysdep.h
parent58a5ba12bffad5916d9897c2870fc483f1db8282 (diff)
sparc64: add basic support
No NPTL, no LDSO support. Bootup with Busybox Ash in Qemu working. Testuite shows only two failures, but mksh continue/break support doesn't work.
Diffstat (limited to 'libc/sysdeps/linux/sparc64/sysdep.h')
-rw-r--r--libc/sysdeps/linux/sparc64/sysdep.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/sysdep.h b/libc/sysdeps/linux/sparc64/sysdep.h
new file mode 100644
index 000000000..31008c34b
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/sysdep.h
@@ -0,0 +1,139 @@
+/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
+ Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
+
+ The GNU C 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 2.1 of the License, or (at your option) any later version.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _LINUX_SPARC64_SYSDEP_H
+#define _LINUX_SPARC64_SYSDEP_H 1
+
+#include <common/sysdep.h>
+
+#undef SYS_ify
+#define SYS_ify(syscall_name) __NR_##syscall_name
+
+#ifdef __ASSEMBLER__
+
+#define SPARC_PIC_THUNK(reg) \
+ .ifndef __sparc_get_pc_thunk.reg; \
+ .section .text.__sparc_get_pc_thunk.reg,"axG",@progbits,__sparc_get_pc_thunk.reg,comdat; \
+ .align 32; \
+ .weak __sparc_get_pc_thunk.reg; \
+ .hidden __sparc_get_pc_thunk.reg; \
+ .type __sparc_get_pc_thunk.reg, #function; \
+__sparc_get_pc_thunk.reg: \
+ jmp %o7 + 8; \
+ add %o7, %reg, %##reg; \
+ .previous; \
+ .endif;
+
+/* The "-4" and "+4" offsets against _GLOBAL_OFFSET_TABLE_ are
+ critical since they represent the offset from the thunk call to the
+ instruction containing the _GLOBAL_OFFSET_TABLE_ reference.
+ Therefore these instructions cannot be moved around without
+ appropriate adjustments to those offsets.
+
+ Furthermore, these expressions are special in another regard. When
+ the assembler sees a reference to _GLOBAL_OFFSET_TABLE_ inside of
+ a %hi() or %lo(), it emits a PC-relative relocation. This causes
+ R_SPARC_HI22 to turn into R_SPARC_PC22, and R_SPARC_LO10 to turn into
+ R_SPARC_PC10, respectively.
+
+ Even when v9 we use a call sequence instead of using "rd %pc" because
+ RDPC is extremely expensive and incurs a full pipeline flush. */
+
+#define SPARC_PIC_THUNK_CALL(reg) \
+ sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
+ call __sparc_get_pc_thunk.reg; \
+ or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg;
+
+#define SETUP_PIC_REG(reg) \
+ SPARC_PIC_THUNK(reg) \
+ SPARC_PIC_THUNK_CALL(reg)
+
+#define SETUP_PIC_REG_LEAF(reg, tmp) \
+ SPARC_PIC_THUNK(reg) \
+ mov %o7, %##tmp; \
+ SPARC_PIC_THUNK_CALL(reg); \
+ mov %##tmp, %o7;
+
+
+#define LOADSYSCALL(x) mov __NR_##x, %g1
+
+#define ENTRY(name) \
+ .align 4; \
+ .global C_SYMBOL_NAME(name); \
+ .type name, @function; \
+C_LABEL(name) \
+ cfi_startproc;
+
+#undef END
+#define END(name) \
+ cfi_endproc; \
+ .size name, . - name
+
+#define LOC(name) .L##name
+
+#undef PSEUDO
+#define PSEUDO(name, syscall_name, args) \
+ .text; \
+ENTRY(name); \
+ LOADSYSCALL(syscall_name); \
+ ta 0x6d; \
+ bcc,pt %xcc, 1f; \
+ nop; \
+ SYSCALL_ERROR_HANDLER \
+1:
+
+#undef PSEUDO_NOERRNO
+#define PSEUDO_NOERRNO(name, syscall_name, args)\
+ .text; \
+ENTRY(name); \
+ LOADSYSCALL(syscall_name); \
+ ta 0x6d;
+
+#undef PSEUDO_ERRVAL
+#define PSEUDO_ERRVAL(name, syscall_name, args) \
+ .text; \
+ENTRY(name); \
+ LOADSYSCALL(syscall_name); \
+ ta 0x6d;
+
+#undef PSEUDO_END
+#define PSEUDO_END(name) \
+ END(name)
+
+#ifndef __PIC__
+# define SYSCALL_ERROR_HANDLER \
+ mov %o7, %g1; \
+ call __syscall_error; \
+ mov %g1, %o7;
+#else
+# define SYSCALL_ERROR_HANDLER \
+0: SETUP_PIC_REG_LEAF(o2,g1) \
+ sethi %gdop_hix22(errno), %g1;\
+ xor %g1, %gdop_lox10(errno), %g1;\
+ ldx [%o2 + %g1], %g1, %gdop(errno);\
+ st %o0, [%g1]; \
+ jmp %o7 + 8; \
+ mov -1, %o0;
+#endif /* PIC */
+
+#endif /* __ASSEMBLER__ */
+
+/* This is the offset from the %sp to the backing store above the
+ register windows. So if you poke stack memory directly you add this. */
+#define STACK_BIAS 2047
+
+#endif