diff options
| author | Mitchell Horne <mhorne@FreeBSD.org> | 2020-12-18 16:09:24 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2021-01-04 20:50:43 +0000 |
| commit | cfe79bddf4b02bd3a9f9d299085ac84e25b0d491 (patch) | |
| tree | c94bc01b4c22998f98fc7b01ccf9c05825474deb | |
| parent | 25e00a2894ea4ea2cbe64f25d9f3d99b60d1ea32 (diff) | |
| download | src-cfe79bddf4b02bd3a9f9d299085ac84e25b0d491.tar.gz src-cfe79bddf4b02bd3a9f9d299085ac84e25b0d491.zip | |
amd64: allow gdb(4) to write to most registers
Similar to the recent patch to arm's gdb stub in r368414, allow GDB to
update the contents of most general purpose registers.
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
(cherry picked from commit 0ef474de88fdb78e3cb7ac9bc0b1b98e5b49b4e4)
| -rw-r--r-- | sys/amd64/amd64/gdb_machdep.c | 38 | ||||
| -rw-r--r-- | sys/amd64/include/gdb_machdep.h | 16 |
2 files changed, 50 insertions, 4 deletions
diff --git a/sys/amd64/amd64/gdb_machdep.c b/sys/amd64/amd64/gdb_machdep.c index f7ca3c07ea36..cf5979b7a1ea 100644 --- a/sys/amd64/amd64/gdb_machdep.c +++ b/sys/amd64/amd64/gdb_machdep.c @@ -92,12 +92,42 @@ gdb_cpu_getreg(int regnum, size_t *regsz) void gdb_cpu_setreg(int regnum, void *val) { + register_t regval = *(register_t *)val; + /* + * Write registers to the trapframe and pcb, if applicable. + * Some scratch registers are not tracked by the pcb. + */ + if (kdb_thread == curthread) { + switch (regnum) { + case GDB_REG_RAX: kdb_frame->tf_rax = regval; break; + case GDB_REG_RBX: kdb_frame->tf_rbx = regval; break; + case GDB_REG_RCX: kdb_frame->tf_rcx = regval; break; + case GDB_REG_RDX: kdb_frame->tf_rdx = regval; break; + case GDB_REG_RSI: kdb_frame->tf_rsi = regval; break; + case GDB_REG_RDI: kdb_frame->tf_rdi = regval; break; + case GDB_REG_RBP: kdb_frame->tf_rbp = regval; break; + case GDB_REG_RSP: kdb_frame->tf_rsp = regval; break; + case GDB_REG_R8: kdb_frame->tf_r8 = regval; break; + case GDB_REG_R9: kdb_frame->tf_r9 = regval; break; + case GDB_REG_R10: kdb_frame->tf_r10 = regval; break; + case GDB_REG_R11: kdb_frame->tf_r11 = regval; break; + case GDB_REG_R12: kdb_frame->tf_r12 = regval; break; + case GDB_REG_R13: kdb_frame->tf_r13 = regval; break; + case GDB_REG_R14: kdb_frame->tf_r14 = regval; break; + case GDB_REG_R15: kdb_frame->tf_r15 = regval; break; + case GDB_REG_PC: kdb_frame->tf_rip = regval; break; + } + } switch (regnum) { - case GDB_REG_PC: - kdb_thrctx->pcb_rip = *(register_t *)val; - if (kdb_thread == curthread) - kdb_frame->tf_rip = *(register_t *)val; + case GDB_REG_RBX: kdb_thrctx->pcb_rbx = regval; break; + case GDB_REG_RBP: kdb_thrctx->pcb_rbp = regval; break; + case GDB_REG_RSP: kdb_thrctx->pcb_rsp = regval; break; + case GDB_REG_R12: kdb_thrctx->pcb_r12 = regval; break; + case GDB_REG_R13: kdb_thrctx->pcb_r13 = regval; break; + case GDB_REG_R14: kdb_thrctx->pcb_r14 = regval; break; + case GDB_REG_R15: kdb_thrctx->pcb_r15 = regval; break; + case GDB_REG_PC: kdb_thrctx->pcb_rip = regval; break; } } diff --git a/sys/amd64/include/gdb_machdep.h b/sys/amd64/include/gdb_machdep.h index 6ad8b01d00ca..add6dc94dfec 100644 --- a/sys/amd64/include/gdb_machdep.h +++ b/sys/amd64/include/gdb_machdep.h @@ -33,6 +33,22 @@ #define GDB_BUFSZ (GDB_NREGS * 16) #define GDB_NREGS 56 +#define GDB_REG_RAX 0 +#define GDB_REG_RBX 1 +#define GDB_REG_RCX 2 +#define GDB_REG_RDX 3 +#define GDB_REG_RSI 4 +#define GDB_REG_RDI 5 +#define GDB_REG_RBP 6 +#define GDB_REG_RSP 7 +#define GDB_REG_R8 8 +#define GDB_REG_R9 9 +#define GDB_REG_R10 10 +#define GDB_REG_R11 11 +#define GDB_REG_R12 12 +#define GDB_REG_R13 13 +#define GDB_REG_R14 14 +#define GDB_REG_R15 15 #define GDB_REG_PC 16 static __inline size_t |