yetangitu/ghidra
1
0
Fork 0
mirror of https://github.com/NationalSecurityAgency/ghidra.git synced 2025-10-06 03:50:02 +02:00
Code Issues Releases Wiki Activity

Implement handling of relocations R_RISCV_CALL, R_RISCV_HI20,

Browse source 
R_RISCV_LO12, R_RISCV_RVC_BRANCH, R_RISCV_RVC_JUMP, R_RISCV_BRANCH,
R_RISCV_JAL
This commit is contained in:
Joakim Nohlgård 2023-08-04 17:18:57 -04:00 • committed by ghidra1
parent 4fbb7bf45a
commit 353a79840d
1 changed files with 58 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

86
Ghidra/Processors/RISCV/src/main/java/ghidra/app/util/bin/format/elf/relocation/RISCV_ElfRelocationHandler.java
View file

@ -186,22 +186,33 @@ public class RISCV_ElfRelocationHandler extends ElfRelocationHandler {
return RelocationResult.UNSUPPORTED;
case RISCV_ElfRelocationConstants.R_RISCV_BRANCH:
// PC-relative branch (SB-Type)
markAsWarning(program, relocationAddress, "R_RISCV_BRANCH", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
// PC-relative branch (B-Type)
int target = (int) (addend + symbolValue - offset);
value32 =
((target & 0x01e) << 7) | ((target & 0x0800) >> 4) | ((target & 0x03e0) << 20) |
((target & 0x1000) << 19) | memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_JAL:
// PC-relative jump (UJ-Type)
markAsWarning(program, relocationAddress, "R_RISCV_JAL", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
// PC-relative jump (J-Type)
target = (int) (addend + symbolValue - offset);
value32 =
(target & 0xff000) | ((target & 0x00800) << 9) | ((target & 0x007fe) << 20) |
((target & 0x100000) << 11) | memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_CALL:
// PC-relative call MACRO call,tail (auipc+jalr pair)
markAsWarning(program, relocationAddress, "R_RISCV_CALL", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
target = (int) (addend + symbolValue - offset);
int target_l = target << 20 >> 20;
int target_h = target - target_l;
value32 = (target_h & 0xfffff000) | memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
value32 = ((target_l & 0x00000fff) << 20) | memory.getInt(relocationAddress.add(4));
memory.setInt(relocationAddress.add(4), value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_CALL_PLT:
// PC-relative call (PLT) MACRO call,tail (auipc+jalr pair) PIC
@ -254,21 +265,25 @@ public class RISCV_ElfRelocationHandler extends ElfRelocationHandler {
case RISCV_ElfRelocationConstants.R_RISCV_HI20:
// Absolute address %hi(symbol) (U-Type)
markAsWarning(program, relocationAddress, "R_RISCV_HI20", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
value32 =
(int) ((symbolValue + 0x800) & 0xfffff000) | memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_LO12_I:
// Absolute address %lo(symbol) (I-Type)
markAsWarning(program, relocationAddress, "R_RISCV_LO12_I", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
value32 =
((int) (symbolValue & 0x00000fff) << 20) | memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_LO12_S:
// Absolute address %lo(symbol) (S-Type)
markAsWarning(program, relocationAddress, "R_RISCV_LO12_S", symbolName, symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
value32 = (int) (symbolValue & 0x00000fff);
value32 = ((value32 & 0x1f) << 7) | ((value32 & 0xfe0) << 20) |
memory.getInt(relocationAddress);
memory.setInt(relocationAddress, value32);
break;
case RISCV_ElfRelocationConstants.R_RISCV_TPREL_HI20:
// TLS LE thread offset %tprel_hi(symbol) (U-Type)
@ -406,17 +421,32 @@ public class RISCV_ElfRelocationHandler extends ElfRelocationHandler {
case RISCV_ElfRelocationConstants.R_RISCV_RVC_BRANCH:
// PC-relative branch offset (CB-Type)
markAsWarning(program, relocationAddress, "R_RISCV_RVC_BRANCH", symbolName,
symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
target = (short) (addend + symbolValue - offset);
// 15 13 | 12 11 10|9 7| 6 5 4 3 2|1 0
// C.BEQZ offset[8|4:3] src offset[7:6|2:1|5] C1
value16 = (short) (((target & 0x100) << 4) | ((target & 0x18) << 7) |
((target & 0xc0) >> 1) |
((target & 0x06) << 2) | ((target & 0x20) >> 3) |
(memory.getShort(relocationAddress) & 0xe383));
byteLength = 2;
memory.setShort(relocationAddress, value16);
break;
case RISCV_ElfRelocationConstants.R_RISCV_RVC_JUMP:
// PC-relative jump offset (CJ-Type)
markAsWarning(program, relocationAddress, "R_RISCV_RVC_BRANCH", symbolName,
symbolIndex,
"TODO, needs support ", elfRelocationContext.getLog());
return RelocationResult.UNSUPPORTED;
target = (short) (addend + symbolValue - offset);
// Complicated swizzling going on here.
// For details, see The RISC-V Instruction Set Manual Volume I: Unprivileged ISA
// 15 13 | 12 11 10 9 8 7 6 5 3 2|1 0
// C.J offset[11| 4|9:8|10|6|7|3:1|5] C1
value16 = (short) (((target & 0x800) << 1) | ((target & 0x10) << 7) |
((target & 0x300) << 1) |
((target & 0x400) >> 2) | ((target & 0x40) << 1) | ((target & 0x80) >> 1) |
((target & 0x0e) << 2) | ((target & 0x20) >> 3) |
(memory.getShort(relocationAddress) & 0xe003));
byteLength = 2;
memory.setShort(relocationAddress, value16);
break;
case RISCV_ElfRelocationConstants.R_RISCV_RVC_LUI:
// Absolute address (CI-Type)