From: Mark Corbin <m...@dibsco.co.uk>
Added the 'get_mcontext' function to extract and populate
the RISC-V machine context from the CPU state.
This function is used to gather the current state of the
general-purpose registers and store it in a 'target_mcontext_'
structure.
Signed-off-by: Mark Corbin <m...@dibsco.co.uk>
Signed-off-by: Ajeet Singh <itac...@freebsd.org>
Signed-off-by: Warner Losh <i...@bsdimp.com>
Co-authored-by: Warner Losh <i...@bsdimp.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Message-ID: <20240916155119.14610-16-itac...@freebsd.org>
Signed-off-by: Alistair Francis <alistair.fran...@wdc.com>
---
bsd-user/riscv/signal.c | 53 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/bsd-user/riscv/signal.c b/bsd-user/riscv/signal.c
index 2597fec2fd..072ad821d2 100644
--- a/bsd-user/riscv/signal.c
+++ b/bsd-user/riscv/signal.c
@@ -61,3 +61,56 @@ abi_long setup_sigframe_arch(CPURISCVState *env, abi_ulong
frame_addr,
get_mcontext(env, mcp, flags);
return 0;
}
+
+/*
+ * Compare with get_mcontext() in riscv/riscv/machdep.c
+ * Assumes that the memory is locked if mcp points to user memory.
+ */
+abi_long get_mcontext(CPURISCVState *regs, target_mcontext_t *mcp,
+ int flags)
+{
+
+ mcp->mc_gpregs.gp_t[0] = tswap64(regs->gpr[5]);
+ mcp->mc_gpregs.gp_t[1] = tswap64(regs->gpr[6]);
+ mcp->mc_gpregs.gp_t[2] = tswap64(regs->gpr[7]);
+ mcp->mc_gpregs.gp_t[3] = tswap64(regs->gpr[28]);
+ mcp->mc_gpregs.gp_t[4] = tswap64(regs->gpr[29]);
+ mcp->mc_gpregs.gp_t[5] = tswap64(regs->gpr[30]);
+ mcp->mc_gpregs.gp_t[6] = tswap64(regs->gpr[31]);
+
+ mcp->mc_gpregs.gp_s[0] = tswap64(regs->gpr[8]);
+ mcp->mc_gpregs.gp_s[1] = tswap64(regs->gpr[9]);
+ mcp->mc_gpregs.gp_s[2] = tswap64(regs->gpr[18]);
+ mcp->mc_gpregs.gp_s[3] = tswap64(regs->gpr[19]);
+ mcp->mc_gpregs.gp_s[4] = tswap64(regs->gpr[20]);
+ mcp->mc_gpregs.gp_s[5] = tswap64(regs->gpr[21]);
+ mcp->mc_gpregs.gp_s[6] = tswap64(regs->gpr[22]);
+ mcp->mc_gpregs.gp_s[7] = tswap64(regs->gpr[23]);
+ mcp->mc_gpregs.gp_s[8] = tswap64(regs->gpr[24]);
+ mcp->mc_gpregs.gp_s[9] = tswap64(regs->gpr[25]);
+ mcp->mc_gpregs.gp_s[10] = tswap64(regs->gpr[26]);
+ mcp->mc_gpregs.gp_s[11] = tswap64(regs->gpr[27]);
+
+ mcp->mc_gpregs.gp_a[0] = tswap64(regs->gpr[10]);
+ mcp->mc_gpregs.gp_a[1] = tswap64(regs->gpr[11]);
+ mcp->mc_gpregs.gp_a[2] = tswap64(regs->gpr[12]);
+ mcp->mc_gpregs.gp_a[3] = tswap64(regs->gpr[13]);
+ mcp->mc_gpregs.gp_a[4] = tswap64(regs->gpr[14]);
+ mcp->mc_gpregs.gp_a[5] = tswap64(regs->gpr[15]);
+ mcp->mc_gpregs.gp_a[6] = tswap64(regs->gpr[16]);
+ mcp->mc_gpregs.gp_a[7] = tswap64(regs->gpr[17]);
+
+ if (flags & TARGET_MC_GET_CLEAR_RET) {
+ mcp->mc_gpregs.gp_a[0] = 0; /* a0 */
+ mcp->mc_gpregs.gp_a[1] = 0; /* a1 */
+ mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
+ }
+
+ mcp->mc_gpregs.gp_ra = tswap64(regs->gpr[1]);
+ mcp->mc_gpregs.gp_sp = tswap64(regs->gpr[2]);
+ mcp->mc_gpregs.gp_gp = tswap64(regs->gpr[3]);
+ mcp->mc_gpregs.gp_tp = tswap64(regs->gpr[4]);
+ mcp->mc_gpregs.gp_sepc = tswap64(regs->pc);
+
+ return 0;
+}
--
2.46.2
