From: Jiangshuai Li via Gdb-patches <gdb-patches@sourceware.org>
To: gdb-patches@sourceware.org
Cc: Jiangshuai Li <jiangshuai_li@linux.alibaba.com>
Subject: [PATCH v2] gdb/csky support .reg2 for kernel 4.x and later
Date: Mon, 25 Jul 2022 10:44:59 +0800 [thread overview]
Message-ID: <20220725024459.21042-1-jiangshuai_li@linux.alibaba.com> (raw)
When kernel's version >= 4.x, the size of .reg2 section will be 400.
Contents of .reg2 are {
unsigned long vr[96]; // vr0~vr15 & fr16~fr31
unsigned long fcr;
unsigned long fesr;
unsigned long fid;
unsigned long reserved;
};
---
gdb/csky-linux-tdep.c | 150 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 134 insertions(+), 16 deletions(-)
diff --git a/gdb/csky-linux-tdep.c b/gdb/csky-linux-tdep.c
index 440045e7713..aa85a299922 100644
--- a/gdb/csky-linux-tdep.c
+++ b/gdb/csky-linux-tdep.c
@@ -36,6 +36,8 @@
#define SIZEOF_CSKY_GREGSET 34*4
/* Float regset fesr fsr fr0-fr31 for CK810. */
#define SIZEOF_CSKY_FREGSET 34*4
+/* Float regset vr0~vr15 fr15~fr31, reserved for CK810 when kernel 4.x. */
+#define SIZEOF_CSKY_FREGSET_K4X 400
/* Offset mapping table from core_section to regcache of general
registers for ck810. */
@@ -118,15 +120,76 @@ csky_supply_fregset (const struct regset *regset,
int fregset_num = ARRAY_SIZE (csky_fregset_offset);
gdb_assert (len >= SIZEOF_CSKY_FREGSET);
- for (i = 0; i < fregset_num; i++)
+ if (len == SIZEOF_CSKY_FREGSET)
{
- if ((regnum == csky_fregset_offset[i] || regnum == -1)
- && csky_fregset_offset[i] != -1)
- {
- int num = csky_fregset_offset[i];
- offset += register_size (gdbarch, num);
- regcache->raw_supply (csky_fregset_offset[i], fregs + offset);
- }
+ for (i = 0; i < fregset_num; i++)
+ {
+ if ((regnum == csky_fregset_offset[i] || regnum == -1)
+ && csky_fregset_offset[i] != -1)
+ {
+ int num = csky_fregset_offset[i];
+ offset += register_size (gdbarch, num);
+ regcache->raw_supply (csky_fregset_offset[i], fregs + offset);
+ }
+ }
+ }
+ else if (len == SIZEOF_CSKY_FREGSET_K4X)
+ {
+ /* When kernel version >= 4.x, .reg2 size will be 400.
+ Contents is {
+ unsigned long vr[96]; // vr0~vr15 + fr16~fr31
+ unsigned long fcr;
+ unsigned long fesr;
+ unsigned long fid;
+ unsigned long reserved;
+ } */
+ int fcr_regno[] = {122, 123, 121}; /* fcr, fesr, fid. */
+
+ /* Supply vr0~vr15. */
+ for (i = 0; i < 16; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, (CSKY_VR0_REGNUM + i)))
+ {
+ offset = 16 * i;
+ regcache->raw_supply (CSKY_VR0_REGNUM + i,
+ fregs + offset);
+ }
+ }
+ /* Supply fr0~fr15. */
+ for (i = 0; i < 16; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, (CSKY_FR0_REGNUM + i)))
+ {
+ offset = 16 * i;
+ regcache->raw_supply (CSKY_FR0_REGNUM + i,
+ fregs + offset);
+ }
+ }
+ /* Supply fr16~fr31. */
+ for (i = 0; i < 16; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, (CSKY_FR16_REGNUM + i)))
+ {
+ offset = (16 * 16) + (8 * i);
+ regcache->raw_supply (CSKY_FR16_REGNUM + i,
+ fregs + offset);
+ }
+ }
+ /* Supply fcr, fesr, fid. */
+ for (i = 0; i < 3; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, fcr_regno[i]))
+ {
+ offset = (16 * 16) + (16 * 8) + (4 * i);
+ regcache->raw_supply (fcr_regno[i],
+ fregs + offset);
+ }
+ }
+ }
+ else
+ {
+ warning (_("Unknow size %ld of section .reg2, can not get value"
+ " of float registers."), len);
}
}
@@ -144,14 +207,66 @@ csky_collect_fregset (const struct regset *regset,
int offset = 0;
gdb_assert (len >= SIZEOF_CSKY_FREGSET);
- for (regno = 0; regno < fregset_num; regno++)
+ if (len == SIZEOF_CSKY_FREGSET)
+ {
+ for (regno = 0; regno < fregset_num; regno++)
+ {
+ if ((regnum == csky_fregset_offset[regno] || regnum == -1)
+ && csky_fregset_offset[regno] != -1)
+ {
+ offset += register_size (gdbarch, csky_fregset_offset[regno]);
+ regcache->raw_collect (regno, fregs + offset);
+ }
+ }
+ }
+ else if (len == SIZEOF_CSKY_FREGSET_K4X)
+ {
+ /* When kernel version >= 4.x, .reg2 size will be 400.
+ Contents is {
+ unsigned long vr[96]; // vr0~vr15 + fr16~fr31
+ unsigned long fcr;
+ unsigned long fesr;
+ unsigned long fid;
+ unsigned long reserved;
+ } */
+ int i = 0;
+ int fcr_regno[] = {122, 123, 121}; /* fcr, fesr, fid. */
+
+ /* Supply vr0~vr15. */
+ for (i = 0; i < 16; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, (CSKY_VR0_REGNUM + i)))
+ {
+ offset = 16 * i;
+ regcache ->raw_collect (CSKY_VR0_REGNUM + i,
+ fregs + offset);
+ }
+ }
+ /* Supply fr16~fr31. */
+ for (i = 0; i < 16; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, (CSKY_FR16_REGNUM + i)))
+ {
+ offset = (16 * 16) + (8 * i);
+ regcache ->raw_collect (CSKY_FR16_REGNUM + i,
+ fregs + offset);
+ }
+ }
+ /* Supply fcr, fesr, fid. */
+ for (i = 0; i < 3; i ++)
+ {
+ if (gdbarch_register_name (gdbarch, fcr_regno[i]))
+ {
+ offset = (16 * 16) + (16 * 8) + (4 * i);
+ regcache ->raw_collect (fcr_regno[i],
+ fregs + offset);
+ }
+ }
+ }
+ else
{
- if ((regnum == csky_fregset_offset[regno] || regnum == -1)
- && csky_fregset_offset[regno] != -1)
- {
- offset += register_size (gdbarch, csky_fregset_offset[regno]);
- regcache->raw_collect (regno, fregs + offset);
- }
+ warning (_("Unknow size %ld of section .reg2, will not set value"
+ " of float registers."), len);
}
}
@@ -166,7 +281,10 @@ static const struct regset csky_regset_float =
{
NULL,
csky_supply_fregset,
- csky_collect_fregset
+ csky_collect_fregset,
+ /* Allow .reg2 has different size, buf size of .reg2 should
+ always is or bigger than SIZEOF_CSKY_FREGSET. */
+ 1
};
/* Iterate over core file register note sections. */
--
2.25.1
next reply other threads:[~2022-07-25 2:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-25 2:44 Jiangshuai Li via Gdb-patches [this message]
2022-07-27 0:49 ` Kevin Buettner via Gdb-patches
2022-07-27 7:29 jiangshuai_li via Gdb-patches
2022-07-28 17:55 ` Kevin Buettner via Gdb-patches
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