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RISC-V: Add support for dl_runtime_profile (BZ #31151)
Code is mostly inspired from the LoongArch one, which has a similar ABI, with minor changes to support riscv32 and register differences. This fixes elf/tst-sprof-basic. This also fixes elf/tst-audit1, elf/tst-audit2 and elf/tst-audit8 with recent binutils snapshots when --enable-bind-now is used. Resolves: BZ #31151 Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Aurelien Jarno
parent
a8a4c94ae9
commit
6b32696116
@ -2,6 +2,10 @@ ifeq ($(subdir),misc)
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sysdep_headers += sys/asm.h
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endif
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ifeq ($(subdir),elf)
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gen-as-const-headers += dl-link.sym
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endif
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# RISC-V's assembler also needs to know about PIC as it changes the definition
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# of some assembler macros.
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ASFLAGS-.os += $(pic-ccflag)
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18
sysdeps/riscv/dl-link.sym
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18
sysdeps/riscv/dl-link.sym
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@ -0,0 +1,18 @@
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#include <stddef.h>
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#include <sysdep.h>
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#include <link.h>
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DL_SIZEOF_RG sizeof(struct La_riscv_regs)
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DL_SIZEOF_RV sizeof(struct La_riscv_retval)
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DL_OFFSET_RG_A0 offsetof(struct La_riscv_regs, lr_reg)
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#ifndef __riscv_float_abi_soft
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DL_OFFSET_RG_FA0 offsetof(struct La_riscv_regs, lr_fpreg)
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#endif
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DL_OFFSET_RG_RA offsetof(struct La_riscv_regs, lr_ra)
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DL_OFFSET_RG_SP offsetof(struct La_riscv_regs, lr_sp)
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DL_OFFSET_RV_A0 offsetof(struct La_riscv_retval, lrv_a0)
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#ifndef __riscv_float_abi_soft
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DL_OFFSET_RV_FA0 offsetof(struct La_riscv_retval, lrv_fa0)
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#endif
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@ -313,13 +313,38 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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if (l->l_info[DT_JMPREL])
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{
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extern void _dl_runtime_resolve (void) __attribute__ ((visibility ("hidden")));
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extern void _dl_runtime_profile (void) __attribute__ ((visibility ("hidden")));
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ElfW(Addr) *gotplt = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
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/* If a library is prelinked but we have to relocate anyway,
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we have to be able to undo the prelinking of .got.plt.
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The prelinker saved the address of .plt for us here. */
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if (gotplt[1])
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l->l_mach.plt = gotplt[1] + l->l_addr;
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_resolve;
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/* The gotplt[0] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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#ifdef SHARED
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if (profile != 0)
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{
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile;
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if (GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), l))
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/* Say that we really want profiling and the timers are
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started. */
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GL(dl_profile_map) = l;
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}
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else
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#endif
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{
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/* This function will get called to fix up the GOT entry
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indicated by the offset on the stack, and then jump to
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the resolved address. */
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_resolve;
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}
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gotplt[1] = (ElfW(Addr)) l;
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}
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@ -20,6 +20,8 @@
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#include <sysdep.h>
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#include <sys/asm.h>
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#include "dl-link.h"
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/* Assembler veneer called from the PLT header code for lazy loading.
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The PLT header passes its own args in t0-t2. */
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@ -88,3 +90,178 @@ ENTRY (_dl_runtime_resolve)
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# Invoke the callee.
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jr t1
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END (_dl_runtime_resolve)
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#if !defined PROF && defined SHARED
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ENTRY (_dl_runtime_profile)
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/* RISC-V we get called with:
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t0 linkr_map pointer
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t1 the scaled offset stored in t0, which can be used
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to calculate the offset of the current symbol in .rela.plt
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t2 %hi(%pcrel(.got.plt)) stored in t2, no use in this function
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t3 dl resolver entry point, no use in this function
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Stack frame layout with hard float:
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RV64 RV32
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[sp, #96] [sp, #48] La_riscv_regs
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[sp, #48] [sp, #24] La_riscv_retval
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[sp, #40] [sp, #20] frame size return from pltenter
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[sp, #32] [sp, #16] dl_profile_call saved a1
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[sp, #24] [sp, #12] dl_profile_call saved a0
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[sp, #16] [sp, #8] T1
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[sp, #0] [sp, #0] ra, fp <- fp
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*/
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# define OFFSET_T1 2*SZREG
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# define OFFSET_SAVED_CALL_A0 OFFSET_T1 + SZREG
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# define OFFSET_SAVED_CALL_A1 OFFSET_SAVED_CALL_A0 + SZREG
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# define OFFSET_FS OFFSET_SAVED_CALL_A1 + SZREG
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# define OFFSET_RV OFFSET_FS + SZREG
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# define OFFSET_RG OFFSET_RV + DL_SIZEOF_RV
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# define SF_SIZE (-(-(OFFSET_RG + DL_SIZEOF_RG) & ALMASK))
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# Save arguments to stack.
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add sp, sp, -SF_SIZE
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REG_S ra, 0(sp)
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REG_S fp, SZREG(sp)
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mv fp, sp
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REG_S a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_S a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_S a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_S a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_S a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_S a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_S a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_S a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_S fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_S fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_S fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_S fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_S fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_S fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_S fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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# Update .got.plt and obtain runtime address of callee.
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slli a1, t1, 1
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mv a0, t0
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add a1, a1, t1 # link map
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mv a2, ra # return addr
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addi a3, fp, OFFSET_RG # La_riscv_regs pointer
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addi a4, fp, OFFSET_FS # frame size return from pltenter
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REG_S a0, OFFSET_SAVED_CALL_A0(fp)
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REG_S a1, OFFSET_SAVED_CALL_A1(fp)
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la t2, _dl_profile_fixup
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jalr t2
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REG_L t3, OFFSET_FS(fp)
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bgez t3, 1f
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# Save the return.
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mv t4, a0
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# Restore arguments from stack.
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REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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REG_L ra, 0(fp)
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REG_L fp, SZREG(fp)
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addi sp, sp, SF_SIZE
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jr t4
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1:
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# The new frame size is in t3.
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sub sp, fp, t3
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andi sp, sp, ALMASK
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REG_S a0, OFFSET_T1(fp)
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mv a0, sp
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addi a1, fp, SF_SIZE
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mv a2, t3
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la t4, memcpy
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jalr t4
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REG_L t4, OFFSET_T1(fp)
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# Call the function.
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REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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jalr t4
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REG_S a0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0(fp)
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REG_S a1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0 + SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0(fp)
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FREG_S fa1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0 + SZFREG(fp)
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#endif
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# Setup call to pltexit.
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REG_L a0, OFFSET_SAVED_CALL_A0(fp)
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REG_L a1, OFFSET_SAVED_CALL_A0 + SZREG(fp)
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addi a2, fp, OFFSET_RG
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addi a3, fp, OFFSET_RV
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la t4, _dl_audit_pltexit
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jalr t4
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REG_L a0, OFFSET_RV + DL_OFFSET_RV_A0(fp)
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REG_L a1, OFFSET_RV + DL_OFFSET_RV_A0 + SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RV + DL_OFFSET_RV_FA0(fp)
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FREG_L fa1, OFFSET_RV + DL_OFFSET_RV_FA0 + SZFREG(fp)
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#endif
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# RA from within La_riscv_reg.
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REG_L ra, OFFSET_RG + DL_OFFSET_RG_RA(fp)
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mv sp, fp
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ADDI sp, sp, SF_SIZE
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REG_S fp, SZREG(fp)
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jr ra
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END (_dl_runtime_profile)
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#endif /* SHARED */
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