Switch to -fPIC.

Using -fPIC for everything allows to link the MiSoC static libraries both into static images such as the BIOS as well as into shared libraries.
m-labs · Jul 26, 2015 · c8ffd0c · c8ffd0c
1 parent a8cd3b9
commit c8ffd0c
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Showing 4 changed files with 24 additions and 9 deletions.
diff --git a/misoclib/soc/cpuif.py b/misoclib/soc/cpuif.py
@@ -4,12 +4,16 @@
 
 def get_cpu_mak(cpu_type):
     if cpu_type == "lm32":
+        triple = "lm32-elf"
         cpuflags = "-mbarrel-shift-enabled -mmultiply-enabled -mdivide-enabled -msign-extend-enabled"
+        clang = ""
     elif cpu_type == "or1k":
-        cpuflags = "-mhard-mul -mhard-div"
+        triple = "or1k-linux"
+        cpuflags = "-fPIC -mhard-mul -mhard-div"
+        clang = "1"
     else:
         raise ValueError("Unsupported CPU type: "+cpu_type)
-    return "CPU={}\nCPUFLAGS={}\n".format(cpu_type, cpuflags)
+    return "TRIPLE={}\nCPU={}\nCPUFLAGS={}\nCLANG={}".format(triple, cpu_type, cpuflags, clang)
 
 
 def get_linker_output_format(cpu_type):

diff --git a/software/bios/linker.ld b/software/bios/linker.ld
@@ -14,6 +14,17 @@ SECTIONS
 		_etext = .;
 	} > rom
 
+	.got :
+	{
+		_GLOBAL_OFFSET_TABLE_ = .;
+		*(.got)
+	} > rom
+
+	.got.plt :
+	{
+		*(.got.plt)
+	} > rom
+
 	.rodata :
 	{
 		. = ALIGN(4);
@@ -30,7 +41,6 @@ SECTIONS
 		_fdata = .;
 		*(.data .data.* .gnu.linkonce.d.*)
 		*(.data1)
-		_gp = ALIGN(16);
 		*(.sdata .sdata.* .gnu.linkonce.s.*)
 		_edata = .;
 	} > rom
@@ -49,6 +59,12 @@ SECTIONS
 		_ebss = .;
 		_end = .;
 	} > sram
+
+	/DISCARD/ :
+	{
+		*(.eh_frame)
+		*(.comment)
+	}
 }
 
 PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 4);
diff --git a/software/common.mak b/software/common.mak
@@ -1,10 +1,9 @@
 include $(MSCDIR)/software/include/generated/cpu.mak
-TRIPLE=$(CPU)-elf
 TARGET_PREFIX=$(TRIPLE)-
 
 RM ?= rm -f
 
-ifeq ($(CPU),or1k)
+ifeq ($(CLANG),1)
 CC_normal      := clang -target $(TRIPLE)
 CX_normal      := clang++ -target $(TRIPLE)
 else

diff --git a/software/libbase/crt0-or1k.S b/software/libbase/crt0-or1k.S
@@ -141,10 +141,6 @@ _crt0:
     /* Setup stack and global pointer */
     l.movhi    r1, hi(_fstack)
     l.ori     r1, r1, lo(_fstack)
-/*
-    l.movhi    r16, hi(_gp)
-    l.ori     r16, gp, lo(_gp)
-*/
 
     /* Clear BSS */
     l.movhi    r21, hi(_fbss)