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* [glibc] LoongArch: Add support for dl_runtime_profile
@ 2023-06-13 2:31 Yinyu Cai
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From: Yinyu Cai @ 2023-06-13 2:31 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eaa5b1cce87d34c945955360b1e519c6994308a1
commit eaa5b1cce87d34c945955360b1e519c6994308a1
Author: caiyinyu <caiyinyu@loongson.cn>
Date: Mon Mar 20 09:25:36 2023 +0800
LoongArch: Add support for dl_runtime_profile
This commit can fix the FAIL item: elf/tst-sprof-basic.
Diff:
---
sysdeps/loongarch/Makefile | 4 +
sysdeps/loongarch/dl-link.sym | 14 +++
sysdeps/loongarch/dl-machine.h | 30 ++++++-
sysdeps/loongarch/dl-trampoline.S | 175 +++++++++++++++++++++++++++++++++++++-
sysdeps/loongarch/sys/asm.h | 1 +
5 files changed, 220 insertions(+), 4 deletions(-)
diff --git a/sysdeps/loongarch/Makefile b/sysdeps/loongarch/Makefile
index 1778fd1c88..43d2f583cd 100644
--- a/sysdeps/loongarch/Makefile
+++ b/sysdeps/loongarch/Makefile
@@ -2,6 +2,10 @@ ifeq ($(subdir),misc)
sysdep_headers += sys/asm.h
endif
+ifeq ($(subdir),elf)
+gen-as-const-headers += dl-link.sym
+endif
+
# LoongArch's assembler also needs to know about PIC as it changes the
# definition of some assembler macros.
ASFLAGS-.os += $(pic-ccflag)
diff --git a/sysdeps/loongarch/dl-link.sym b/sysdeps/loongarch/dl-link.sym
new file mode 100644
index 0000000000..868ab7c6eb
--- /dev/null
+++ b/sysdeps/loongarch/dl-link.sym
@@ -0,0 +1,14 @@
+#include <stddef.h>
+#include <sysdep.h>
+#include <link.h>
+
+DL_SIZEOF_RG sizeof(struct La_loongarch_regs)
+DL_SIZEOF_RV sizeof(struct La_loongarch_retval)
+
+DL_OFFSET_RG_A0 offsetof(struct La_loongarch_regs, lr_reg)
+DL_OFFSET_RG_FA0 offsetof(struct La_loongarch_regs, lr_fpreg)
+DL_OFFSET_RG_RA offsetof(struct La_loongarch_regs, lr_ra)
+DL_OFFSET_RG_SP offsetof(struct La_loongarch_regs, lr_sp)
+
+DL_OFFSET_RV_A0 offsetof(struct La_loongarch_retval, lrv_a0)
+DL_OFFSET_RV_FA0 offsetof(struct La_loongarch_retval, lrv_a1)
diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
index 1e07d124f9..e217d37c4b 100644
--- a/sysdeps/loongarch/dl-machine.h
+++ b/sysdeps/loongarch/dl-machine.h
@@ -270,10 +270,34 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
/* If using PLTs, fill in the first two entries of .got.plt. */
if (l->l_info[DT_JMPREL])
{
- extern void _dl_runtime_resolve (void)
- __attribute__ ((visibility ("hidden")));
+ extern void _dl_runtime_resolve (void) attribute_hidden;
+ extern void _dl_runtime_profile (void) attribute_hidden;
+
ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
- gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
+
+ /* The got[0] entry contains the address of a function which gets
+ called to get the address of a so far unresolved function and
+ jump to it. The profiling extension of the dynamic linker allows
+ to intercept the calls to collect information. In this case we
+ don't store the address in the GOT so that all future calls also
+ end in this function. */
+ if (profile != 0)
+ {
+ gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile;
+
+ if (GLRO(dl_profile) != NULL
+ && _dl_name_match_p (GLRO(dl_profile), l))
+ /* Say that we really want profiling and the timers are
+ started. */
+ GL(dl_profile_map) = l;
+ }
+ else
+ {
+ /* This function will get called to fix up the GOT entry
+ indicated by the offset on the stack, and then jump to
+ the resolved address. */
+ gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
+ }
gotplt[1] = (ElfW (Addr)) l;
}
#endif
diff --git a/sysdeps/loongarch/dl-trampoline.S b/sysdeps/loongarch/dl-trampoline.S
index c978e2ef63..ed9ec0901c 100644
--- a/sysdeps/loongarch/dl-trampoline.S
+++ b/sysdeps/loongarch/dl-trampoline.S
@@ -19,6 +19,8 @@
#include <sysdep.h>
#include <sys/asm.h>
+#include "dl-link.h"
+
/* Assembler veneer called from the PLT header code for lazy loading.
The PLT header passes its own args in t0-t2. */
#ifdef __loongarch_soft_float
@@ -31,7 +33,6 @@ ENTRY (_dl_runtime_resolve)
/* Save arguments to stack. */
ADDI sp, sp, -FRAME_SIZE
-
REG_S ra, sp, 9*SZREG
REG_S a0, sp, 1*SZREG
REG_S a1, sp, 2*SZREG
@@ -88,3 +89,175 @@ ENTRY (_dl_runtime_resolve)
/* Invoke the callee. */
jirl zero, t1, 0
END (_dl_runtime_resolve)
+
+
+ENTRY (_dl_runtime_profile)
+ /* LoongArch we get called with:
+ t0 linkr_map pointer
+ t1 the scaled offset stored in t0, which can be used
+ to calculate the offset of the current symbol in .rela.plt
+ t2 %hi(%pcrel(.got.plt)) stored in t2, no use in this function
+ t3 dl resolver entry point, no use in this function
+
+ Stack frame layout:
+ [sp, #96] La_loongarch_regs
+ [sp, #48] La_loongarch_retval
+ [sp, #40] frame size return from pltenter
+ [sp, #32] dl_profile_call saved a1
+ [sp, #24] dl_profile_call saved a0
+ [sp, #16] T1
+ [sp, #0] ra, fp <- fp
+ */
+
+# define OFFSET_T1 16
+# define OFFSET_SAVED_CALL_A0 OFFSET_T1 + 8
+# define OFFSET_FS OFFSET_SAVED_CALL_A0 + 16
+# define OFFSET_RV OFFSET_FS + 8
+# define OFFSET_RG OFFSET_RV + DL_SIZEOF_RV
+
+# define SF_SIZE (-(-(OFFSET_RG + DL_SIZEOF_RG) & ALMASK))
+
+ /* Save arguments to stack. */
+ ADDI sp, sp, -SF_SIZE
+ REG_S ra, sp, 0
+ REG_S fp, sp, 8
+
+ or fp, sp, zero
+
+ REG_S a0, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG
+ REG_S a1, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG
+ REG_S a2, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG
+ REG_S a3, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG
+ REG_S a4, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG
+ REG_S a5, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG
+ REG_S a6, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG
+ REG_S a7, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_S fa0, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG
+ FREG_S fa1, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG
+ FREG_S fa2, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG
+ FREG_S fa3, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG
+ FREG_S fa4, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG
+ FREG_S fa5, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG
+ FREG_S fa6, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG
+ FREG_S fa7, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG
+#endif
+
+ /* Update .got.plt and obtain runtime address of callee. */
+ SLLI a1, t1, 1
+ or a0, t0, zero
+ ADD a1, a1, t1
+ or a2, ra, zero /* return addr */
+ ADDI a3, fp, OFFSET_RG /* La_loongarch_regs pointer */
+ ADDI a4, fp, OFFSET_FS /* frame size return from pltenter */
+
+ REG_S a0, fp, OFFSET_SAVED_CALL_A0
+ REG_S a1, fp, OFFSET_SAVED_CALL_A0 + SZREG
+
+ la t2, _dl_profile_fixup
+ jirl ra, t2, 0
+
+ REG_L t3, fp, OFFSET_FS
+ bge t3, zero, 1f
+
+ /* Save the return. */
+ or t4, v0, zero
+
+ /* Restore arguments from stack. */
+ REG_L a0, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG
+ REG_L a1, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG
+ REG_L a2, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG
+ REG_L a3, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG
+ REG_L a4, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG
+ REG_L a5, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG
+ REG_L a6, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG
+ REG_L a7, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_L fa0, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG
+ FREG_L fa1, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG
+ FREG_L fa2, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG
+ FREG_L fa3, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG
+ FREG_L fa4, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG
+ FREG_L fa5, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG
+ FREG_L fa6, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG
+ FREG_L fa7, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG
+#endif
+
+ REG_L ra, fp, 0
+ REG_L fp, fp, SZREG
+
+ ADDI sp, sp, SF_SIZE
+ jirl zero, t4, 0
+
+1:
+ /* The new frame size is in t3. */
+ SUB sp, fp, t3
+ BSTRINS sp, zero, 3, 0
+
+ REG_S a0, fp, OFFSET_T1
+
+ or a0, sp, zero
+ ADDI a1, fp, SF_SIZE
+ or a2, t3, zero
+ la t5, memcpy
+ jirl ra, t5, 0
+
+ REG_L t6, fp, OFFSET_T1
+
+ /* Call the function. */
+ REG_L a0, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG
+ REG_L a1, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG
+ REG_L a2, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG
+ REG_L a3, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG
+ REG_L a4, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG
+ REG_L a5, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG
+ REG_L a6, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG
+ REG_L a7, fp, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_L fa0, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG
+ FREG_L fa1, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG
+ FREG_L fa2, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG
+ FREG_L fa3, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG
+ FREG_L fa4, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG
+ FREG_L fa5, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG
+ FREG_L fa6, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG
+ FREG_L fa7, fp, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG
+#endif
+ jirl ra, t6, 0
+
+ REG_S a0, fp, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0
+ REG_S a1, fp, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0 + SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_S fa0, fp, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0
+ FREG_S fa1, fp, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0 + SZFREG
+#endif
+
+ /* Setup call to pltexit. */
+ REG_L a0, fp, OFFSET_SAVED_CALL_A0
+ REG_L a1, fp, OFFSET_SAVED_CALL_A0 + SZREG
+ ADDI a2, fp, OFFSET_RG
+ ADDI a3, fp, OFFSET_RV
+ la t7, _dl_audit_pltexit
+ jirl ra, t7, 0
+
+ REG_L a0, fp, OFFSET_RV + DL_OFFSET_RV_A0
+ REG_L a1, fp, OFFSET_RV + DL_OFFSET_RV_A0 + SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_L fa0, fp, OFFSET_RV + DL_OFFSET_RV_FA0
+ FREG_L fa1, fp, OFFSET_RV + DL_OFFSET_RV_FA0 + SZFREG
+#endif
+
+ /* RA from within La_loongarch_reg. */
+ REG_L ra, fp, OFFSET_RG + DL_OFFSET_RG_RA
+ or sp, fp, zero
+ ADDI sp, sp, SF_SIZE
+ REG_S fp, fp, SZREG
+
+ jirl zero, ra, 0
+
+END (_dl_runtime_profile)
diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
index 3dca70a107..0bb430bb05 100644
--- a/sysdeps/loongarch/sys/asm.h
+++ b/sysdeps/loongarch/sys/asm.h
@@ -31,6 +31,7 @@
#define SLLI slli.d
#define ADDI addi.d
#define ADD add.d
+#define SUB sub.d
#define BSTRINS bstrins.d
#define LI li.d
#define FREG_L fld.d
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