diff options
Diffstat (limited to 'ldso/ldso/mips/resolve.S')
| -rw-r--r-- | ldso/ldso/mips/resolve.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/ldso/ldso/mips/resolve.S b/ldso/ldso/mips/resolve.S index f5d988a80..d7951a1b4 100644 --- a/ldso/ldso/mips/resolve.S +++ b/ldso/ldso/mips/resolve.S @@ -112,3 +112,54 @@ _dl_runtime_resolve: .end _dl_runtime_resolve .previous +/* Assembler veneer called from the PLT header code when using the + non-PIC ABI. + + Code in each PLT entry puts the caller's return address into t7 ($15), + the PLT entry index into t8 ($24), the address of _dl_runtime_pltresolve + into t9 ($25) and the address of .got.plt into gp ($28). __dl_runtime_pltresolve + needs a0 ($4) to hold the link map and a1 ($5) to hold the index into + .rel.plt (== PLT entry index * 4). */ + + .text + .align 2 + .globl _dl_runtime_pltresolve + .type _dl_runtime_pltresolve,@function + .ent _dl_runtime_pltresolve +_dl_runtime_pltresolve: + .frame $29, 40, $31 + .set noreorder + # Save arguments and sp value in stack. + subu $29, 40 + lw $10, 4($28) + # Modify t9 ($25) so as to point .cpload instruction. + addiu $25, 12 + # Compute GP. + .cpload $25 + .set reorder + + /* Store function arguments from registers to stack */ + sw $15, 36($29) + sw $4, 16($29) + sw $5, 20($29) + sw $6, 24($29) + sw $7, 28($29) + + /* Setup functions args and call __dl_runtime_pltresolve. */ + move $4, $10 + sll $5, $24, 3 + jal __dl_runtime_pltresolve + + /* Restore function arguments from stack to registers */ + lw $31, 36($29) + lw $4, 16($29) + lw $5, 20($29) + lw $6, 24($29) + lw $7, 28($29) + + /* Do a tail call to the original function */ + addiu $29, 40 + move $25, $2 + jr $25 + .end _dl_runtime_pltresolve + .previous |