From 9ef15439a40676b3bca769deb9a037000457c12e Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Thu, 12 Jul 2001 10:14:09 +0000
Subject: First cut of PowerPC port.  It works for hello world, but has lots of
 debugging information is still there.

---
 ldso/ldso/powerpc/dl-sysdep.h | 136 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 ldso/ldso/powerpc/dl-sysdep.h

(limited to 'ldso/ldso/powerpc/dl-sysdep.h')

diff --git a/ldso/ldso/powerpc/dl-sysdep.h b/ldso/ldso/powerpc/dl-sysdep.h
new file mode 100644
index 000000000..16b853ce3
--- /dev/null
+++ b/ldso/ldso/powerpc/dl-sysdep.h
@@ -0,0 +1,136 @@
+/*
+ * 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.
+ */
+#define 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)  _dl_init_got(GOT_BASE,MODULE)
+
+/* Stuff for the PLT.  */
+#define PLT_INITIAL_ENTRY_WORDS 18
+#define PLT_LONGBRANCH_ENTRY_WORDS 0
+#define PLT_TRAMPOLINE_ENTRY_WORDS 6
+#define PLT_DOUBLE_SIZE (1<<13)
+#define PLT_ENTRY_START_WORDS(entry_number) \
+  (PLT_INITIAL_ENTRY_WORDS + (entry_number)*2				\
+   + ((entry_number) > PLT_DOUBLE_SIZE					\
+      ? ((entry_number) - PLT_DOUBLE_SIZE)*2				\
+      : 0))
+#define PLT_DATA_START_WORDS(num_entries) PLT_ENTRY_START_WORDS(num_entries)
+
+/* Macros to build PowerPC opcode words.  */
+#define OPCODE_ADDI(rd,ra,simm) \
+  (0x38000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
+#define OPCODE_ADDIS(rd,ra,simm) \
+  (0x3c000000 | (rd) << 21 | (ra) << 16 | ((simm) & 0xffff))
+#define OPCODE_ADD(rd,ra,rb) \
+  (0x7c000214 | (rd) << 21 | (ra) << 16 | (rb) << 11)
+#define OPCODE_B(target) (0x48000000 | ((target) & 0x03fffffc))
+#define OPCODE_BA(target) (0x48000002 | ((target) & 0x03fffffc))
+#define OPCODE_BCTR() 0x4e800420
+#define OPCODE_LWZ(rd,d,ra) \
+  (0x80000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
+#define OPCODE_LWZU(rd,d,ra) \
+  (0x84000000 | (rd) << 21 | (ra) << 16 | ((d) & 0xffff))
+#define OPCODE_MTCTR(rd) (0x7C0903A6 | (rd) << 21)
+#define OPCODE_RLWINM(ra,rs,sh,mb,me) \
+  (0x54000000 | (rs) << 21 | (ra) << 16 | (sh) << 11 | (mb) << 6 | (me) << 1)
+
+#define OPCODE_LI(rd,simm)    OPCODE_ADDI(rd,0,simm)
+#define OPCODE_ADDIS_HI(rd,ra,value) \
+  OPCODE_ADDIS(rd,ra,((value) + 0x8000) >> 16)
+#define OPCODE_LIS_HI(rd,value) OPCODE_ADDIS_HI(rd,0,value)
+#define OPCODE_SLWI(ra,rs,sh) OPCODE_RLWINM(ra,rs,sh,0,31-sh)
+
+
+#define PPC_DCBST(where) asm volatile ("dcbst 0,%0" : : "r"(where) : "memory")
+#define PPC_SYNC asm volatile ("sync" : : : "memory")
+#define PPC_ISYNC asm volatile ("sync; isync" : : : "memory")
+#define PPC_ICBI(where) asm volatile ("icbi 0,%0" : : "r"(where) : "memory")
+#define PPC_DIE asm volatile ("tweq 0,0")
+
+/*
+ * 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.
+ */
+// finaladdr = LOAD ?
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD) \
+	{int type=ELF32_R_TYPE((RELP)->r_info);		\
+	if(type==R_PPC_NONE){				\
+	}else if(type==R_PPC_ADDR32){			\
+		*REL += (SYMBOL);			\
+	}else if(type==R_PPC_RELATIVE){			\
+		*REL = (Elf32_Word)(LOAD) + (RELP)->r_addend;		\
+	}else if(type==R_PPC_REL24){			\
+		Elf32_Sword delta = (Elf32_Word)(SYMBOL) - (Elf32_Word)(REL);	\
+		*REL &= 0xfc000003;			\
+		*REL |= (delta & 0x03fffffc);		\
+	}else if(type==R_PPC_JMP_SLOT){			\
+		Elf32_Sword delta = (Elf32_Word)(SYMBOL) - (Elf32_Word)(REL);	\
+		/*if (delta << 6 >> 6 != delta)_dl_exit(99);*/	\
+		*REL = OPCODE_B(delta);			\
+	}else{						\
+	  _dl_exit(100+ELF32_R_TYPE((RELP)->r_info));	\
+	}						\
+/*hexprint(*REL);*/					\
+	PPC_DCBST(REL); PPC_SYNC; PPC_ICBI(REL);	\
+	}
+
+#if 0
+	case R_386_32:		\
+	  *REL += SYMBOL;		\
+	  break;		\
+	case R_386_PC32:		\
+	  *REL += SYMBOL - (unsigned long) REL;		\
+	  break;		\
+	case R_386_GLOB_DAT:		\
+	case R_386_JMP_SLOT:		\
+	  *REL = SYMBOL;		\
+	  break;		\
+	case R_386_RELATIVE:		\
+	  *REL += (unsigned long) LOAD;		\
+	  break;
+#endif
+
+/*
+ * 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()		\
+	__asm__ volatile ("mtlr %0\n\t" \
+		    "blrl\n\t"	\
+		    : "=r" (status) :	"r" (_dl_elf_main))
+
+
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+
+#define MAGIC1 EM_PPC
+#undef  MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "powerpc"
+
+struct elf_resolve;
+extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+void _dl_init_got(unsigned long *lpnt,struct elf_resolve *tpnt);
+
+
+#define do_rem(result, n, base)  result = (n % base)
-- 
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