caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[LLDB][MIPS] microMIPS breakpoints, disassembly and compressed addresses

Browse Source 
SUMMARY:
    This patch detects microMIPS symbols, sets breakpoints using un-compressed address and 
    display disassembly in mixed mode for microMIPS applications (running on bare-iron targets).

    Reviewers: clayborg
    Subscribers: nitesh.jain, mohit.bhakkad, sagar, bhushan and lldb-commits
    Differential Revision: http://reviews.llvm.org/D12079

llvm-svn: 248248
This commit is contained in:
Jaydeep Patil
2015-09-22 06:36:56 +00:00
parent 132c2c4bc7
commit 44d07fcc7c
6 changed files with 135 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
View File

@@ -1894,6 +1894,10 @@ FindArmAarch64MappingSymbol(const char* symbol_name)
return '\0';
}
#define STO_MIPS_ISA (3 << 6)
#define STO_MICROMIPS (2 << 6)
#define IS_MICROMIPS(ST_OTHER) (((ST_OTHER) & STO_MIPS_ISA) == STO_MICROMIPS)
// private
unsigned
ObjectFileELF::ParseSymbols (Symtab *symtab,
@@ -2113,6 +2117,37 @@ ObjectFileELF::ParseSymbols (Symtab *symtab,
}
}
}
/*
* MIPS:
* The bit #0 of an address is used for ISA mode (1 for microMIPS, 0 for MIPS).
* This allows processer to switch between microMIPS and MIPS without any need
* for special mode-control register. However, apart from .debug_line, none of
* the ELF/DWARF sections set the ISA bit (for symbol or section). Use st_other
* flag to check whether the symbol is microMIPS and then set the address class
* accordingly.
*/
const llvm::Triple::ArchType llvm_arch = arch.GetMachine();
if (llvm_arch == llvm::Triple::mips || llvm_arch == llvm::Triple::mipsel
|| llvm_arch == llvm::Triple::mips64 || llvm_arch == llvm::Triple::mips64el)
{
if (IS_MICROMIPS(symbol.st_other))
m_address_class_map[symbol.st_value] = eAddressClassCodeAlternateISA;
else if ((symbol.st_value & 1) && (symbol_type == eSymbolTypeCode))
{
symbol.st_value = symbol.st_value & (~1ull);
m_address_class_map[symbol.st_value] = eAddressClassCodeAlternateISA;
}
else
{
if (symbol_type == eSymbolTypeCode)
m_address_class_map[symbol.st_value] = eAddressClassCode;
else if (symbol_type == eSymbolTypeData)
m_address_class_map[symbol.st_value] = eAddressClassData;
else
m_address_class_map[symbol.st_value] = eAddressClassUnknown;
}
}
}
// symbol_value_offset may contain 0 for ARM symbols or -1 for