svn commit: r352730 - head/sys/riscv/riscv

[Mitchell Horne]

Author: mhorne
Date: Thu Sep 26 00:58:47 2019
New Revision: 352730
URL: https://svnweb.freebsd.org/changeset/base/352730

Log:
  Fix some broken relocation handling
  
  In a few cases, the symbol lookup is missing before attempting to
  perform the relocation. While the relocation types affected are
  currently unused, this results in an uninitialized variable warning,
  that is escalated to an error when building with clang.
  
  Reviewed by:	markj
  MFC after:	3 days
  Differential Revision:	https://reviews.freebsd.org/D21773

Modified:
  head/sys/riscv/riscv/elf_machdep.c

Modified: head/sys/riscv/riscv/elf_machdep.c
==============================================================================
--- head/sys/riscv/riscv/elf_machdep.c	Thu Sep 26 00:54:07 2019	(r352729)
+++ head/sys/riscv/riscv/elf_machdep.c	Thu Sep 26 00:58:47 2019	(r352730)
@@ -373,6 +373,10 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbas
 		break;
 
 	case R_RISCV_PCREL_HI20:
+		error = lookup(lf, symidx, 1, &addr);
+		if (error != 0)
+			return (-1);
+
 		val = addr - (Elf_Addr)where;
 		insn32p = (uint32_t *)where;
 		before32 = *insn32p;
@@ -385,6 +389,10 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbas
 		break;
 
 	case R_RISCV_PCREL_LO12_I:
+		error = lookup(lf, symidx, 1, &addr);
+		if (error != 0)
+			return (-1);
+
 		val = addr - (Elf_Addr)where;
 		insn32p = (uint32_t *)where;
 		before32 = *insn32p;
@@ -396,6 +404,10 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbas
 		break;
 
 	case R_RISCV_PCREL_LO12_S:
+		error = lookup(lf, symidx, 1, &addr);
+		if (error != 0)
+			return (-1);
+
 		val = addr - (Elf_Addr)where;
 		insn32p = (uint32_t *)where;
 		before32 = *insn32p;
@@ -412,6 +424,7 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbas
 		if (error != 0)
 			return (-1);
 
+		val = addr;
 		insn32p = (uint32_t *)where;
 		before32 = *insn32p;
 		imm20 = calc_hi20_imm(val);