From f9e3d5ffc0472279dde8589fa52e2dfb7e78de03 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Tue, 19 Mar 2002 17:05:51 +0000
Subject: Initial mips ldso porting effort from Steven J. Hill.  Not yet
 complete, but off to a fine start.

---
 ldso/ldso/mips/dl-syscalls.h | 137 +++++++++++++++++++++++++++++++++++++++++++
 ldso/ldso/mips/dl-sysdep.h   |  63 ++++++++++++++++++++
 ldso/ldso/mips/ld_syscalls.h | 137 +++++++++++++++++++++++++++++++++++++++++++
 ldso/ldso/mips/ld_sysdep.h   |  63 ++++++++++++++++++++
 ldso/ldso/mips/resolve.S     |  48 +++++++++++++++
 5 files changed, 448 insertions(+)
 create mode 100644 ldso/ldso/mips/dl-syscalls.h
 create mode 100644 ldso/ldso/mips/dl-sysdep.h
 create mode 100644 ldso/ldso/mips/ld_syscalls.h
 create mode 100644 ldso/ldso/mips/ld_sysdep.h
 create mode 100644 ldso/ldso/mips/resolve.S

diff --git a/ldso/ldso/mips/dl-syscalls.h b/ldso/ldso/mips/dl-syscalls.h
new file mode 100644
index 000000000..2327219df
--- /dev/null
+++ b/ldso/ldso/mips/dl-syscalls.h
@@ -0,0 +1,137 @@
+/*
+ * This file contains the system call macros and syscall
+ * numbers used by the shared library loader. Taken from
+ * Linux/MIPS 2.4.17 version kernel.
+ */
+
+#define __NR_SYSCALL_BASE		4000
+
+#define __NR_exit			(__NR_SYSCALL_BASE +   1)
+#define __NR_read			(__NR_SYSCALL_BASE +   3)
+#define __NR_write			(__NR_SYSCALL_BASE +   4)
+#define __NR_open			(__NR_SYSCALL_BASE +   5)
+#define __NR_close			(__NR_SYSCALL_BASE +   6)
+#define __NR_getuid			(__NR_SYSCALL_BASE +  24)
+#define __NR_getgid			(__NR_SYSCALL_BASE +  47)
+#define __NR_geteuid			(__NR_SYSCALL_BASE +  49)
+#define __NR_getegid			(__NR_SYSCALL_BASE +  50)
+#define __NR_readlink			(__NR_SYSCALL_BASE +  85)
+#define __NR_mmap			(__NR_SYSCALL_BASE +  90)
+#define __NR_munmap			(__NR_SYSCALL_BASE +  91)
+#define __NR_stat			(__NR_SYSCALL_BASE + 106)
+#define __NR_mprotect			(__NR_SYSCALL_BASE + 125)
+
+/* Here are the macros which define how this platform makes
+ * system calls.  This particular variant does _not_ set
+ * errno (note how it is disabled in __syscall_return) since
+ * these will get called before the errno symbol is dynamicly
+ * linked. */
+
+#define _syscall0(type,name) \
+type name(void) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %2\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return -1; \
+}
+
+#define _syscall1(type,name,atype,a) \
+type name(atype a) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %3\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall2(type,name,atype,a,btype,b) \
+type name(atype a, btype b) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %4\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "r" (__a1), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall3(type,name,atype,a,btype,b,ctype,c) \
+type name(atype a, btype b, ctype c) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a2 asm("$6") = (unsigned long) c; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %5\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall4(type,name,atype,a,btype,b,ctype,c,dtype,d) \
+type name(atype a, btype b, ctype c, dtype d) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a2 asm("$6") = (unsigned long) c; \
+	register unsigned long __a3 asm("$7") = (unsigned long) d; \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %5\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "+r" (__a3) \
+	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
diff --git a/ldso/ldso/mips/dl-sysdep.h b/ldso/ldso/mips/dl-sysdep.h
new file mode 100644
index 000000000..24cbc3d04
--- /dev/null
+++ b/ldso/ldso/mips/dl-sysdep.h
@@ -0,0 +1,63 @@
+/*
+ * Various assmbly language/system dependent  hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ */
+
+/* 
+ * Define this if the system uses RELOCA.
+ */
+#undef ELF_USES_RELOCA
+
+/*
+ * Get a pointer to the argv array.  On many platforms this can be just
+ * the address if the first argument, on other platforms we need to
+ * do something a little more subtle here.
+ */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long*)   ARGS)
+
+/*
+ * Initialization sequence for a GOT.
+ */
+#define INIT_GOT(GOT_BASE,MODULE) \
+{				\
+  GOT_BASE[0] = (unsigned long) _dl_linux_resolve; \
+  GOT_BASE[1] = (unsigned long) MODULE; \
+}
+
+/*
+ * Here is a macro to perform a relocation.  This is only used when
+ * bootstrapping the dynamic loader.  RELP is the relocation that we
+ * are performing, REL is the pointer to the address we are relocating.
+ * SYMBOL is the symbol involved in the relocation, and LOAD is the
+ * load address.
+ *
+ * !!!NOTE!!!
+ *
+ * For MIPS, we don't have any DT_JMPREL or DT_PLTRELSZ dynamic
+ * entries, so this macro function is empty. The code contained
+ * in elfinterp.c does the real relocation work.
+ */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD)
+
+
+/*
+ * Transfer control to the user's application, once the dynamic loader
+ * is done.  This routine has to exit the current function, then 
+ * call the _dl_elf_main function.
+ */
+
+#define START()   return (void) _dl_elf_main;      
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_MIPS
+#define MAGIC2 EM_MIPS_RS3_LE
+/* Used for error messages */
+#define ELF_TARGET "MIPS"
+
+struct elf_resolve;
+unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+#define do_rem(result, n, base)  result = (n % base)
diff --git a/ldso/ldso/mips/ld_syscalls.h b/ldso/ldso/mips/ld_syscalls.h
new file mode 100644
index 000000000..2327219df
--- /dev/null
+++ b/ldso/ldso/mips/ld_syscalls.h
@@ -0,0 +1,137 @@
+/*
+ * This file contains the system call macros and syscall
+ * numbers used by the shared library loader. Taken from
+ * Linux/MIPS 2.4.17 version kernel.
+ */
+
+#define __NR_SYSCALL_BASE		4000
+
+#define __NR_exit			(__NR_SYSCALL_BASE +   1)
+#define __NR_read			(__NR_SYSCALL_BASE +   3)
+#define __NR_write			(__NR_SYSCALL_BASE +   4)
+#define __NR_open			(__NR_SYSCALL_BASE +   5)
+#define __NR_close			(__NR_SYSCALL_BASE +   6)
+#define __NR_getuid			(__NR_SYSCALL_BASE +  24)
+#define __NR_getgid			(__NR_SYSCALL_BASE +  47)
+#define __NR_geteuid			(__NR_SYSCALL_BASE +  49)
+#define __NR_getegid			(__NR_SYSCALL_BASE +  50)
+#define __NR_readlink			(__NR_SYSCALL_BASE +  85)
+#define __NR_mmap			(__NR_SYSCALL_BASE +  90)
+#define __NR_munmap			(__NR_SYSCALL_BASE +  91)
+#define __NR_stat			(__NR_SYSCALL_BASE + 106)
+#define __NR_mprotect			(__NR_SYSCALL_BASE + 125)
+
+/* Here are the macros which define how this platform makes
+ * system calls.  This particular variant does _not_ set
+ * errno (note how it is disabled in __syscall_return) since
+ * these will get called before the errno symbol is dynamicly
+ * linked. */
+
+#define _syscall0(type,name) \
+type name(void) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %2\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return -1; \
+}
+
+#define _syscall1(type,name,atype,a) \
+type name(atype a) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %3\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall2(type,name,atype,a,btype,b) \
+type name(atype a, btype b) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %4\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "r" (__a1), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall3(type,name,atype,a,btype,b,ctype,c) \
+type name(atype a, btype b, ctype c) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a2 asm("$6") = (unsigned long) c; \
+	register unsigned long __a3 asm("$7"); \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %5\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "=r" (__a3) \
+	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
+
+#define _syscall4(type,name,atype,a,btype,b,ctype,c,dtype,d) \
+type name(atype a, btype b, ctype c, dtype d) \
+{ \
+	register unsigned long __v0 asm("$2") = __NR_##name; \
+	register unsigned long __a0 asm("$4") = (unsigned long) a; \
+	register unsigned long __a1 asm("$5") = (unsigned long) b; \
+	register unsigned long __a2 asm("$6") = (unsigned long) c; \
+	register unsigned long __a3 asm("$7") = (unsigned long) d; \
+	\
+	__asm__ volatile ( \
+	".set\tnoreorder\n\t" \
+	"li\t$2, %5\t\t\t# " #name "\n\t" \
+	"syscall\n\t" \
+	".set\treorder" \
+	: "=&r" (__v0), "+r" (__a3) \
+	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_##name) \
+	: "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24"); \
+	\
+	if (__a3 == 0) \
+		return (type) __v0; \
+	return (type) -1; \
+}
diff --git a/ldso/ldso/mips/ld_sysdep.h b/ldso/ldso/mips/ld_sysdep.h
new file mode 100644
index 000000000..24cbc3d04
--- /dev/null
+++ b/ldso/ldso/mips/ld_sysdep.h
@@ -0,0 +1,63 @@
+/*
+ * Various assmbly language/system dependent  hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ */
+
+/* 
+ * Define this if the system uses RELOCA.
+ */
+#undef ELF_USES_RELOCA
+
+/*
+ * Get a pointer to the argv array.  On many platforms this can be just
+ * the address if the first argument, on other platforms we need to
+ * do something a little more subtle here.
+ */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned long*)   ARGS)
+
+/*
+ * Initialization sequence for a GOT.
+ */
+#define INIT_GOT(GOT_BASE,MODULE) \
+{				\
+  GOT_BASE[0] = (unsigned long) _dl_linux_resolve; \
+  GOT_BASE[1] = (unsigned long) MODULE; \
+}
+
+/*
+ * Here is a macro to perform a relocation.  This is only used when
+ * bootstrapping the dynamic loader.  RELP is the relocation that we
+ * are performing, REL is the pointer to the address we are relocating.
+ * SYMBOL is the symbol involved in the relocation, and LOAD is the
+ * load address.
+ *
+ * !!!NOTE!!!
+ *
+ * For MIPS, we don't have any DT_JMPREL or DT_PLTRELSZ dynamic
+ * entries, so this macro function is empty. The code contained
+ * in elfinterp.c does the real relocation work.
+ */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD)
+
+
+/*
+ * Transfer control to the user's application, once the dynamic loader
+ * is done.  This routine has to exit the current function, then 
+ * call the _dl_elf_main function.
+ */
+
+#define START()   return (void) _dl_elf_main;      
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_MIPS
+#define MAGIC2 EM_MIPS_RS3_LE
+/* Used for error messages */
+#define ELF_TARGET "MIPS"
+
+struct elf_resolve;
+unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+#define do_rem(result, n, base)  result = (n % base)
diff --git a/ldso/ldso/mips/resolve.S b/ldso/ldso/mips/resolve.S
new file mode 100644
index 000000000..b160b1cfb
--- /dev/null
+++ b/ldso/ldso/mips/resolve.S
@@ -0,0 +1,48 @@
+/*
+ * Linux dynamic resolving code for MIPS. Fixes up the GOT entry as
+ * indicated in register t8 and jumps to the resolved address. Shamelessly
+ * ripped from 'sysdeps/mips/dl-machine.h' in glibc-2.2.5.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING.LIB" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996-2001 Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>
+ * Copyright (C) 2002 Steven J. Hill <sjhill@realitydiluted.com>
+ *
+ */
+.text
+.align	2
+.globl	_dl_linux_resolve
+.type	_dl_linux_resolve,@function
+.ent	_dl_linux_resolve
+_dl_linux_resolve:
+	.frame	$29, 40, $31
+	.set noreorder
+	move	$3, $28		# Save GP
+	addu	$25, 8		# t9 ($25) now points at .cpload instruction
+	.cpload	$25		# Compute GP
+	.set reorder
+	move	$2, $31		# Save slot call pc
+	subu	$29, 40		# Save arguments and sp value in stack
+	.cprestore 32
+	sw	$15, 36($29)
+	sw	$4, 16($29)
+	sw	$5, 20($29)
+	sw	$6, 24($29)
+	sw	$7, 28($29)
+	move	$4, $24
+	move	$5, $15
+	move	$6, $3
+	move	$7, $2
+	jal     _dl_linux_resolver
+	lw	$31, 36($29)
+	lw	$4, 16($29)
+	lw	$5, 20($29)
+	lw	$6, 24($29)
+	lw	$7, 28($29)
+	addu	$29, 40
+	move	$25, $2
+        jr	$25
+.size _dl_linux_resolve,.-_dl_linux_resolve
+.end _dl_linux_resolve
-- 
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